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The Promise of the CCD: Challenges and Opportunity for Quality
Improvement and Population Health
John D. D’Amore, MS1, Dean F. Sittig, PhD1, Adam Wright, PhD2,
M. Sriram Iyengar, PhD1 Roberta B. Ness, MD, MPH3
1School of Biomedical Informatics and 3School of Public Health at the University of Texas
Health Science Center, Houston, TX; 2Division of General Medicine, Brigham and
Women’s Hospital, Boston, MA
Interoperability is a requirement of recent electronic health record (EHR) adoption incentive programs in the
United States. One approved structure for clinical data exchange is the continuity of care document (CCD). While
primarily designed to promote communication between providers during care transitions, coded data in the CCD
can be re-used to aggregate data from different EHRs. This provides an opportunity for provider networks to
measure quality and improve population health from a consolidated database. To evaluate such potential, this
research collected CCDs from 14 organizations and developed a computer program to parse and aggregate them.
In total, 139 CCDs were parsed yielding 680 data in the core content modules of problems, medications, allergies
and results. Challenges to interoperability were catalogued and potential quality metrics evaluated based on
available content. This research highlights the promise of CCDs for population health and recommends changes
for future interoperability standards.
Recent incentives and policy decisions are promoting the rapid adoption of electronic health records (EHRs) in the
United States. The American Reinvestment and Recovery Act of 2009 commits up to $27 billion in payments,
beginning in 2011, to eligible professionals and hospitals that meaningfully use EHRs1. Those reimbursements will
come in three stages and are expected to propel ambulatory and hospital EHR adoption to over 70% by 20202. The
rapid timeline for uptake, however, will lead to a heterogeneous environment of technology. With over 400 EHRs
certified for the first stage of ‘Meaningful Use,’ interoperability will remain a concern.3 As providers seek to
improve quality and population health, technology standards advanced by this federal legislation will enable new
methods for data aggregation.
In July 2010, the Department of Health and Human Services adopted the Continuity of Care Document (CCD) as an
option to meet the goals of clinical data exchange for ‘Meaningful Use’4. Using an extensible markup language
(XML) based structure, the CCD was collaboratively developed in 2006 by harmonizing standards from the
American Society for Testing and Materials and Health Level 7 (HL7)5. The CCD provides a flexible format for the
communication of free-text and codified data. Given the recent emergence of the standard, most health information
exchanges are not routinely using CCDs today, although select institutions have launched pilots to explore their
potential6, 7. The lack of widespread use means that EHR developers must rely on guidance from standards
organizations, such as the Health Information Technology Standards Panel (HITSP), Integrating the Healthcare
Enterprise (IHE) and HL7, on how to create and exchange CCDs.
HITSP released for implementation its first CCD patient summary construct, named C32, in 20078. That construct is
directly referenced in the final federal rule for Stage 1 of ‘Meaningful Use’4. The most recent C32 specification
references two other constructs developed by HITSP as well as technical frameworks previously released by IHE
and HL79, 10. Naturally, documents and specifications from different organizations and developed at different times
may lead to varying interpretations about requirements. For Stage 1 of ‘Meaningful Use,’ the National Institute for
Standards and Technology (NIST) has released the definitive testing procedures to determine whether an EHR-
generated CCD meets the standards for ‘Meaningful Use’ certification11. These procedures focus on the ability of
EHRs to generate, receive and display four categories of coded patient data with specific vocabularies: problem lists,
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diagnostic test results, medication lists and medication allergy lists. Although the CCD can encode additional
clinical content, these four sections plus patient demographic information form the foundation for what certified
EHRs will be capable of exchanging for the first two years of the federal incentive program.
New models of care integration being advanced by private insurers and federal payers require data from multiple
clinical entities to determine if patients are receiving appropriate care12. While the primary intent of clinical data
exchange is provider-to-provider communication, the structured data of the CCD has potential re-use. Specifically,
provider based care networks could create CCD extracts for all patients and consolidate this information into a
longitudinal clinical data warehouse.
This strategy overcomes four significant barriers facing providers in the United States: 1) providers avoid the costs
and competitive threats associated with joining a health information exchange13, 2) this strategy works in regions
that do not have an existing health information exchange, 3) networks do not need to consolidate independent care
providers onto a single EHR technology14, and 4) quality measurement exempts data aggregation from privacy
restrictions since protected health information may be shared among clinicians for quality improvement15.
This research examines the promise of using C32 compliant CCDs to create a normalized database for quality
improvement and population health management. The context for such data aggregation would be a care model
where providers with different certified EHRs have entered into a data use agreement to share identified medical
records. This research focuses on the clinical content modules of the CCD being tested for Stage 1 EHR certification
as part of ‘Meaningful Use’ (See Table 1 for all CCD sections and associated vocabularies). To examine the
potential for quality measurement, each of the ambulatory measures endorsed as part of Stage 1 ‘Meaningful Use’
were evaluated based on the parsed CCD clinical content modules.
Table 1. Sections and Vocabularies of the CCD and Modules Examined in this Research.
C32 Standard for Clinical Content
Directive Medicine (SNOMED CT)
Drug Sensitivity (UNII) & RxNorm
Comment Free Text
(Problems) Classification of Diseases (ICD)*
Encounters Uniform Billing (UB) Standard
Healthcare Provider National Provider Identifier
Immunizations Vaccine Value Sets
Insurance Provider X12 Billing Standard
Language Spoken Language Value Set
Person Information Free Text & HL7
Plan of Care Free Text
Required by Stage 1
EHR Testing Procedures
Systematized Nomenclature of
Uniform Ingredient Identifier
Medication Allergies Only
SNOMED CT & International
Implied, but not specified
Required for hospital
but not ambulatory
SNOMED CT, ICD and Current
Procedural Terminology (CPT)*
Logical Observation Identifiers
Names and Codes (LOINC)
Free Text & HL7
* While the HITSP preferred vocabulary for problems and procedures is SNOMED, the Final Rule for EHR certification
provides flexibility for other vocabularies as specified in the Table 1. Note: Information Source and Pregnancy status are modules
not included in the above table since they overlap with content provided in the CCD header and condition modules.
Implied, but not specified
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To assess the feasibility of a CCD-based aggregation strategy, samples needed to be collected from multiple EHR
vendor products. No large collection of sample CCDs from multiple sources has been made available to the public,
so the research team contacted vendors and healthcare organizations for EHR-generated samples of fictitious patient
data conformant to the HITSP C32 standard. A request for sample CCDs was included in the February eNews
distribution email sent from the Certification Commission for Health Information Technology to approximately
12,000 recipients. Additional contacts were made in person during HIMSS 2011 at the Interoperability Showcase
and with individuals in the exhibit hall. As an incentive to submit, organizations providing sample CCDs were
offered feedback on the parsing results of their samples. Organizations that submitted samples were also assured that
this research not would identify specific EHRs and that their CCDs would not be publicly released. These two
methods yielded the majority of participating organizations, but additional CCDs were also examined from
standards organizations and a research library of synthetic EHR data from ExactData (Rochester, NY).
To aggregate and analyze the collected CCDs, a program was written in Python 3.1 (Python Software Foundation,
Wolfeboro Falls, NH) to parse clinical content modules and patient demographic details. The Python program
utilized the document object module (DOM) library for XML parsing and used HITSP documentation for the
identification of relevant sections in the CCD. Any data provided outside the modules identified for this research
were ignored. String-based lists encoded clinical content for each of the modules. Data elements were imported
based on the tags identified in the C32 construct. Separate lists were created to store the primary content of a module
(e.g. medication code), its associated vocabulary (e.g. RxNorm) and other relevant content (e.g. dose, dosing interval
and brand name). At least one clinical content module was imported from each CCD.
The Python program included a timestamp on each of the CCDs as they were imported to report efficiency of XML
parsing. All processing was performed on a quad-core Intel Core2 computer running Windows 7 (Redmond, WA)
with 3Gb of RAM. Results included the processing time of each CCD as well as total counts of data elements for
each of the primary content modules. Generic medication codes were counted for the medication module, problem
codes for the condition module, laboratory result codes for the results module and allergy codes for the allergy
module. Null values were only counted if the section tags were present or corresponding detail was provided as
The programming included error traps and empty string notifications to catalog the challenges of CCDs imported
from various EHRs. These warnings prompted formative evaluation of approximately 30 XML files to manually
identify the causes for unsuccessful parsing. At least 1 CCD was selected for manual inspection from each
submitting organization. All inspections were conducted by a single reviewer to maintain evaluative consistency,
although no formal instrument was used given the wide range of issues encountered. In addition, the data were
examined for what potential conflicts may exist if imported into a single relational database. Since the imported
content was under 1,000 clinical content modules, those data were reviewed in Microsoft Excel 2007 (Redmond,
To determine if the collected content was adequate for objective quality assessment, each of the 44 ambulatory
quality measures included in Stage 1 ‘Meaningful Use’ was evaluated16. If coded data in patient detail and clinical
modules were sufficient to calculate the measure, then that quality metric was recorded as possible using the CCD
parser. If not, the fact that content was missing was recorded. The electronic standards for ambulatory quality
measures have been approved through the National Quality Forum and retrieved from the federal website for
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In total, 196 CCDs were collected from 14 different organizations representing at least 10 different EHRs (Table 2).
Several CCDs (n=57) were excluded from analysis since no clinical data were present for parsing or they were
redundant with other submitted CCDs. This left 139 CCDs which were successfully parsed with at least one clinical
data element. Parsing time averaged 80ms (SD 53ms) per CCD and the mean number of clinical data elements was
4.9 (SD 5.4) per CCD (Figure 1 shows timing and content distribution of CCDs). The counts of parsed data elements
by clinical module were: 109 for allergies, 220 for problems, 168 for medications and 183 for diagnostic results.
Table 2. CCD Collection by Source Figure 1. Parsing Time and Content for 139 CCDs.*
6 93 87
5 93 49
3 10 3
Total 14 196 139
*Chart whiskers show absolute minima and maxima; the blue box represents lower and upper quartile around the
median center line.
Challenges were categorized into three major themes: 1) Problematic CCD hierarchy and organization, 2)
Inconsistency in data representation and 3) Data conflict or redundancy within the CCD (Illustrative examples
included in Table 3).
1. Problematic CCD Hierarchy and Organization
One of the common issues encountered when working through the CCDs was the lack of consistent template root
identifiers for the clinical content modules. This is critical to extract codified data since identifiers reference the
technical specification applied in XML formatting. Specifically, a majority of EHR samples did not include the root
template identifiers for HITSP C83 content modules even though these identifiers are referenced in the 2009 HITSP
C32 specification and CCD samples8,10. To accommodate the missing identifiers, the Python program was modified
to include checks so that any template root identifier from a standards organization would be sufficient to parse the
content modules analyzed in this research.
Next, the use of tabs and line breaks was inconsistent between different EHRs. Some EHRs do not use line breaks or
spacing, some use tabs without consistent line breaks and others use a combination to provide formatting similar to
the examples from standard organizations. While line breaks and spacing do not affect the ability of programs
utilizing the DOM library for XML parsing, human review of the CCD to identify problematic sections and data
elements becomes significantly more difficult.
The optionality of data elements within each clinical content module presented additional difficulty in creating a
normalized database. Relevant data elements with a problem, medication, allergy or result include information on
the time of onset, current status, units of measurement, dosing interval, severity and result interpretation.
Unfortunately, the C32 construct leaves most of the associated data as optional, which can therefore be omitted in a
compliant CCD. Our parsing results display a large number of records that omit data like a date of a problem’s onset
or drug dosing interval.
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2. Inconsistency in Data Representation
Since EHR data typically undergo a translation between the source system and the normalized vocabularies for
Stage 1 ‘Meaningful Use’, there is the opportunity for mappings to no known code. Incomplete mappings were
observed in this research and have been previously identified in medication interoperability research and
harmonization discussions for the CCD6,17. An example of this occurs when a null value is set for a clinical content
code such as generic medication in RxNorm, while a translation code is populated, such as brand name in the
National Drug Classification (NDC).
In addition to missing values, non-uniformity was observed in the associated data content for each code. One
example repeatedly noted in our research was inconsistency of effective time for problems and laboratory results.
While the examples provided by HITSP are generally eight characters in YYYYMMDD format, some EHRs adapt
this format to include six more characters for time in HHMMSS format. Others also append a hyphen and four digits
for HHMM. One EHR did not comply with the character date format at all, instead inserting values such as ‘% 2m
%’, presumably meaning two months. Inconsistency was also noted in the dose quantity tag for solid oral
medications, which included alternative unit labels such as ‘tablet,’ ‘Tablet,’ ‘tab,’ ‘tab(s),’ ‘mg,’ and ‘g.’ Only the
mass terms qualify as standard units, although some flexibility is permitted in specifications to identify non-units,
like tablet or red blood cell count, when deemed important18.
Another data representation challenge identified in this research includes content relation between laboratory results.
One example is that corresponding procedures coded within the same module could not always be related to
appropriate results. While the published example CCD from NIST approaches this by collapsing a single procedure,
such as a blood draw, with all corresponding results into a single XML entry, other EHRs included all procedures
and results within the same entry. This thereby eliminates any codified relation between the procedure and result.
Another example was the use of a comprehensive code for a testing panel with multiple lab values. Since multiple
lab results are returned for comprehensive panels, such as blood urea nitrogen and transaminases within a metabolic
panel, the generic label of a lab panel was insufficient to interpret the content of each test result.
3. Data Conflict or Redundancy
The final rule for Stage 1 ‘Meaningful Use’ specifies either SNOMED-CT or ICD-9 for the codification of problems
and both vocabularies were observed in the sample CCDs collected. In addition to conflict generated from two
acceptable vocabularies for the same information, many sample CCDs utilized code systems that did not conform to
standards. Observed misapplied terminologies included NDC for generic drug code, NDC for medication allergy
and Multum Drug Allergy codes for medication allergy. In addition, a few CCDs had codes that did not correspond
to any recognized standard vocabulary.
Lastly, there was a level of redundancy of content transmitted in portions of the CCD. One example is the RxNorm
vocabulary, using codes like ‘309362’ for ‘clopidogrel 75 mg oral tablet.’ This code contains information on drug
dose and route of administration, but many CCDs included additional XML elements that also code such
information. In other cases, some CCDs omitted redundant content by skipping optional data elements altogether.
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Table 3. Illustrative Challenges from 139 CCDs from Multiple EHRs.
This section on medications has
the HL7 root identifier, shown in
yellow, but is missing the
corresponding root identifiers for
HITSP and IHE specifications.
Since dosage and route of
administration are optional tags in
the medication section, those data
are skipped in this XML section
although known based on the
RxNorm code, shown in blue.
<section classCode="DOCSECT" moodCode="EVN">
<templateId root="2.16.840.1.113818.104.22.168.8" assigningAuthorityName="HL7 CCD"/>
<code code="10160-0" codeSystemName="LOINC" displayName="History of medication use"/>
<entry contextConductionInd="true" typeCode="COMP">
<substanceAdministration classCode="SBADM" moodCode="EVN">
<id extension="12039106" root="22.214.171.124.4.1.16517"/>
<manufacturedMaterial classCode="MMAT" determinerCode="KIND">
<code code="309362" codeSystemName ="RxNorm" displayName="clopidogrel 75 MG Oral Tablet">
<td> <content ID="result-4">Comprehensive Metabolic Panel</content> </td>
<td> BUN=16 mg/dL, AST=20 mg/dL </td>
<observation classCode="OBS" moodCode="EVN">
<templateId root="2.16.840.1.1138126.96.36.199.83.15" assigningAuthorityName="HITSP C83" />
<code code="24323-8" displayName="Comprehensive Metabolic Panel" codeSystemName="LOINC" />
<text> <reference value="#result-4" /> </text>
<value xsi:type="PQ" value="16" unit="mg/dL" />
<observation classCode="OBS" moodCode="EVN">
<templateId root="2.16.840.1.1138188.8.131.52.83.15" assigningAuthorityName="HITSP C83" />
<code code="24323-8" displayName="Comprehensive Metabolic Panel" codeSystemName="LOINC" />
<text> <reference value="#result-4" /> </text>
<value xsi:type="PQ" value="20" unit="mg/dL" />
A panel laboratory code is used to
refer to multiple laboratory
values. The difference between
BUN and AST, shown in blue, is
written into the text field but each
LOINC value only codes for the
comprehensive panel, shown in
yellow. Consequently individual
test values, shown in green, are
not connected with corresponding
lab results from the panel.
An incomplete mapping of
internal code sets from NDC to
RxNorm can exist in medications.
information is set to a null value,
shown in yellow, while branded
data are codified, shown in blue.
Redundancy is seen in the
multiple template root identifiers,
shown in green.
* Portions of XML have been excerpted and codeSystem tags translated into names to simplify display.
<templateId root="2.16.840.1.1138184.108.40.206.83.8.2" assigningAuthorityName="HITSP C83" />
<templateId root="2.16.840.1.1138220.127.116.11.53" assigningAuthorityName="CCD"/>
<templateId root="18.104.22.168.4.1.19322.214.171.124.126.96.36.199" assigningAuthorityName="IHE PCC" />
<code xsi:type="CE" nullFlavor="UNK">
<originalText>Acetaminophen 650 mg; po q 6h prn<reference value="#med_" /></originalText>
<translation code="00364724812" displayName="Acetaminophen 650 mg" codeSystemName="NDC" />
Potential Quality Metrics Based on Parsed Clinical Modules
Our analysis showed that 12 (27%) of the ambulatory quality measures included in Stage 1 of ‘Meaningful Use’
were calculable based on patient information and the four clinical content modules parsed in this research (Table 4).
While this may appear low, 35 (80%) of all measures could be calculated by incrementally adding the procedures
module to the sections in this research. The remaining data which would be required to calculate all quality metrics
are vital signs, smoking status, patient communication and communication between providers.
While only a fraction of the quality measures were calculable based on the information in the CCD as currently
constructed for Stage 1 of ‘Meaningful Use,’ important clinical questions could be answered with available data.
Several queries proposed in the research include the relationship between problems and the utilization of therapeutic
medications, the relation between medications and corresponding laboratory results over time and prescription of
medications that may evoke an allergic response based on the known allergens of a patient. All of these theoretical
queries could be posed to a relational database based on information extracted from the CCD.
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Table 4: Ambulatory Quality Measures for Stage 1 of ‘Meaningful Use’ Possible with Proposed CCD Parsing.
(NQF 0001, 0036 , 0047)
(NQF 0385, 0387, 0389)
(NQF 0013, 0018, 0067, 0068, 0070,
0073, 0074, 0075, 0081, 0083, 0084)
(NQF 0055, 0056, 0059, 0061,
0062, 0064, 0088, 0089, 0575)
Mental Health & Substance Abuse
(NQF 0004, 0105)
(NQF 0002, 0024, 0038)
(NQF 0012, 0014)
(NQF 0027, 0028, 0031, 0032,
0034, 0041, 0043, 0421)
NQF 0033 Chlamydia Screening
NQF 0052 Lower Back Pain
NQF 0086 Glaucoma Evaluation
Problem Medications Results
Possible Based on
Procedures 2 of 3
Procedures 0 of 3
Procedures, Vitals 2 of 11
Procedures, Vitals, Other 3 of 9
Procedures 1 of 2
1 of 3
Procedures 0 of 2
Procedures, Vitals, Other 3 of 8
0 of 3
Many organizations and developers are continuing work on improving EHR interoperability and quality
measurement, but Stage 1 of ‘Meaningful Use’ provides a waypoint to evaluate progress. Thousands of eligible
professionals and hospitals are expected to install certified EHRs and achieve Stage 1 goals before the end of 2012.
This research provides real-world evidence that four major clinical domains can be extracted and aggregated from
different EHRs for quality measurement. This aggregation is particularly promising for two reasons.
First, certified EHRs using CCDs provide a foundation for care teams to share information both during patient
handoffs and retrospectively to evaluate performance and improvement opportunities. With tools for CCD-based
data aggregation in place, one can envision a clinically integrated organization surveying populations to determine
what therapeutic regimens are working best and when patients need additional support through disease management.
While such analytics are possible today using older standards, they often require expensive interfaces with
sophisticated vocabulary normalization or consolidation onto a single EHR across providers. A CCD-based clinical
data warehouse would require only a shared, secure server for integrated care teams to extract XML documents and
appropriate parsing and aggregation tools to analyze performance.
Second, the CCD as implemented in the C32 standard has clear potential for growth. This research limited its
examined clinical modules to the four with clear vocabularies and testing procedures for Stage 1 of ‘Meaningful
Use.’ As more standard vocabularies are endorsed for clinical modules of the CCD, it is clear that further clinical
analytics and population management will be possible.
The potential for CCDs as a normalizing force for clinical data has also been identified and funded from the Office
of the National Coordinator for Health Information Technology. The popHealth project is an open source reference
implementation software service that enables quality measurement of ambulatory EHRs by extracting CCDs19. The
technology has been developed by the non-profit MITRE Corporation (Bedford, MA) and has begun pilots this year
in ambulatory practices. As demonstrated in this research, CCDs can provide needed data for established quality
measurement, although the inclusion of procedures remains a key element missing from requirements for Stage 1 of
The technology developed in this research can be deployed on shared networks among clinicians with different
EHRs. This offers a low-cost option for organizations adopting emerging models of care that require internal data
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sharing and quality measurement12. Moreover, centralized aggregation and analysis at the provider level reduces the
competitive threats and privacy concerns of data sharing with external parties13. The analysis of normalized data via
CCD aggregation also has application to payer, public health and research organizations. While sharing of individual
medical data typically requires patient consent, aggregate analytics can be advanced through distributed queries of
CCD-based databases. This could, for example, provide a uniform method to evaluate practices for prospective
clinical trials while avoiding the exchange of protected health information. While outside the scope of this research,
future models for health information exchanges could also be potential aggregators of CCD-based clinical content20.
Further research is required to evaluate how the CCD usage will evolve with patient privacy, public health needs and
the evolving role for health information exchange.
Despite the potential highlighted through this research, many challenges were identified for using the CCD in a
codified fashion for data aggregation. The largest concerns for CCD use for analytics relate to inconsistent data
representation, ambiguous relations between data elements and the optionality of key data. Several of the specific
issues identified in this research have already been recognized by standards organizations and are included as notes
in the sample CCDs for EHR developers17. One likely source of these concerns is the multitude of documents,
organizations and technical frameworks that are referenced throughout the revision history of HITSP C32 construct.
Research and development on CCD interoperability would benefit from a single document including all standards,
structures and vocabularies without reference to external sources. Another source for these challenges is likely the
limited number of CCD examples that have been made available for the EHR development community to review.
Other issues regarding data redundancy and multiple vocabularies are more amendable to software solutions. Until
redundancy has been eliminated in the source CCD standards, parsing technologies should be programmed with
logic to search for multiple acceptable formats. Once data are entered into a relational structure, database rules and
business query logic can be used to accommodate multiple vocabularies. For example, all the problem codes for a
particular diagnosis can be searched in both SNOMED-CT and ICD-9 to accommodate different terminologies. In
addition, database transformation logic can normalize alternative spellings, such as ‘tab(s)’ and ‘tablets,’ and
populate omissions when deduced from other data. The downsides of post-processing logic are added expense to the
development of clinical warehouses and a less compelling use case for open source software.
Many limitations of this research are based in the collection methodology for sample CCDs. Participants willing to
submit sample CCDs may not be representative of the EHR development community at large. This has the potential
to create selection bias where CCD aggregation from other EHRs would raise significant concerns not observed in
this research. In addition, received samples were deliberately fictitious. These CCDs may be significantly less
complex than actual patient records, so parsing speed may be overly optimistic. In addition, while HITSP C32
conformant samples were requested in all correspondence with research participants, no elements of the CCD
identify the version information of the source EHR. Therefore it was not possible for the researchers to verify that
the CCDs were generated from certified technology meeting federal standards for ‘Meaningful Use.’ Finally, only a
fraction of the CCDs were manually reviewed to categorize potential issues for use in an aggregated data store.
Consequently, the challenges represented here are unlikely comprehensive of all concerns.
Based on this research’s findings, several recommendations can be made for future changes to CCD specifications.
First, consolidated guidelines should be available that unify information necessary for CCD development and
resolve issues on data representation. Although this document would likely be large, it would be helpful to eliminate
cross-document and external organization references. This document should also include graphics to help developers
understand section relationships, since tables do not easily convey such complex detail. Second, a large library of
fictitious CCDs from multiple EHRs should be made available to the public. Specifically, it would be desirable if
every certified EHR had the XML documents submitted as part of its testing procedures released into the public
domain. Examples of CCDs are not proprietary instruments and developers will benefit from observing the
approaches of different EHRs. Making a large repository available for public review would also yield more findings
to what was observed in this research.
Next, the required data and vocabularies for CCDs should be increased. Currently, a number of data elements within
the HITSP C32 construct can be optionally omitted. This optionality may represent consideration that not all EHRs
natively capture these data, but they are valuable in the application of population health. Key information related to
medications, allergies, results and problems should be required if known as part of certification for clinical data
exchange. Moreover, the addition of normalized data on procedures, vital signs and communication would
substantially increase the capacity of CCDs to measure ambulatory quality. Since CCDs are also a common standard
Page 9 of 10
for acute care settings, it is also recommended that new data relevant to hospitalizations be added to the
specification. While not evaluated in this research, inpatient quality metrics often require information on the timing
of care and such detail is not present in the C32 construct.
Lastly as future terminologies are incorporated into the CCD, those vocabularies should become available to
developers in the medical domain free of charge. While the current required terminologies do not present any
concerns, the potential to use CPTs, a proprietary standard of the American Medical Association, as the future
vocabulary for procedures raises fair use concerns for technologies that aggregate medical data.
This research takes a novel approach to interoperability by collecting CCDs from various EHRs and analyzing the
opportunity and challenges encountered when aggregating data for quality improvement. Through parsing and
aggregating these CCDs, it provides tangible evidence that normalized clinical databases are possible using the
approved standards for Stage 1 of ‘Meaningful Use.’ This strategy overcomes many barriers facing providers that
seek to improve population health in heterogeneous EHR environments. This research also identifies issues in CCD
interoperability by cataloging concerns from actual samples and provides recommendations for future specification
John D’Amore is a part-time employee of Allscripts, a vendor for electronic health records. Sample CCDs collected
in this research were not shared with anyone at Allscripts and remain confidential to the researchers and the
University of Texas School of Biomedical Informatics.
Dean F. Sittig, PhD and Adam Wright, PhD are supported in part by Grant No. 10510592 for Patient-Centered
Cognitive Support under the Strategic Health IT Advanced Research Projects Program (SHARP) from the Office of
the National Coordinator for Health Information Technology.
M. Sriram Iyengar, PhD and Roberta B. Ness, MD, MPH have no disclosures to report.
The research team would like to graciously thank the individuals who submitted CCDs as part of this research.
Although not all participants wanted public acknowledgement for their contribution, we would like to specifically
thank Keith Boone, Diane Kenyon, Roopesh Kumar, Robert Murphy, John Dawson, Todd Johnson, Dan Rizzo,
Tone Southerland and Jiajie Zhang. Sue Reber and others at the Certification Commission for Health Information
Technology were very gracious in allowing our team to include information about this research project in their
newsletter. In addition, we would like to thank John Piescik and Rob McCreedy from MITRE for their time in
discussing Laika and popHealth, open source software that test conformant CCDs and provide population health
Page 10 of 10 Download full-text
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