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The Colorado Health Observation Regional Data Service (CHORDS):
Creating a Shared Distributed Data Network for Local Public Health and Research Needs
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Presenters
• Rachel Zucker, Adult and Child Consortium for Health Outcomes Research and Delivery Science (ACCORDS)
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BACKGROUND: CHORDS
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CHORDS is a network conceived in 2011 that uses electronic health record (EHR) data to support public health evaluation,
monitoring and research efforts.
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• Data Partners: Twelve health provider organizations in Colorado
• Data Users: Public health agencies serving the seven-county Denver Metro region and three public health agencies serving northern Colorado counties and local researchers from a variety of fields
• Goal: Expanded use of EHR data to achieve public health and research goals through reliable and location-specific information
• Funding: Primary support is provided by the Colorado Health Foundation (CHF); two-year renewal of grant began May 2018
CHORDS: A Primer
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CHORDS Data Partners
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• Approximately 3 million patients’ EHR data
• Limited dataset• Geocoded home addresses
CHORDS Data
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• Data Partners: Twelve health provider organizations in Colorado
• Data Users: Public health agencies serving the seven-county Denver Metro region and three public health agencies serving northern Colorado counties and local researchers from a variety of fields
• Goal: Expanded use of EHR data to achieve public health and research goals through reliable and location-specific information
• Funding: Primary support is provided by the Colorado Health Foundation (CHF); two-year renewal of grant began May 2018
CHORDS: A Primer
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CHORDS Catchment in Colorado
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CHORDS Coverage
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Colorado CountyCoverage (CHORDS Patient
Population ÷ ACS 2011-2015 Population estimates)
Adams 32%Arapahoe 21%Boulder 19%Broomfield 20%Denver 36%Douglas 12%Jefferson 21%Larimer 7%Weld 11%
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• Data Partners: Twelve health provider organizations in Colorado
• Data Users: Public health agencies serving the seven-county Denver Metro region and three public health agencies serving northern Colorado counties and local researchers from a variety of fields
• Goal: Expanded use of EHR data to achieve public health and research goals through reliable and location-specific information
• Funding: Primary support is provided by the Colorado Health Foundation (CHF); two-year renewal of grant began May 2018
CHORDS: A Primer
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The CHORDS Network
Data Users:Denver Metro
Public Health Agencies
Technology Partner:University of Colorado
Anschutz Medical Campus
Technology Partner:CORHIO & CCMCN
Data Partners:Health Care and
Mental Health Partners
Convener: CHI
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BACKGROUND: POPMEDNET
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Federated Model for Secure Data Sharing
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PopMedNet
• Open-source application to facilitate data sharing among multi-site health data networks
• HIPAA-compliant distributed infrastructurePopMedNet Portal
• Web-based app for query distribution
DataMart Client
• Windows application for query execution and response installed at each site
Web Service API
• Implements application logic to process requests against network(s)
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PopMedNet
• Scalable; used by several regional and national networks:
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The Query Process
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BACKGROUND: CHORDS VIRTUAL DATA WAREHOUSE
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The CHORDS Data Model
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• Encounters • Diagnoses (ICD-9/-10 codes)• Procedures (ICD-9/-10; CPT, HCPCS)• Social History (e.g., tobacco, alcohol, and/or drug use)• Laboratory Results (e.g., test type, date of test and result)• Patient Demographics (e.g., age, gender, race, ethnicity)• Patient Residence and Community Factors (e.g., census tract of
residence, American Community Survey socioeconomic data)• Prescribing (e.g. written prescriptions; rxnorm; prescribing md,
quantity, refills)• Vital Signs (e.g. height and weight; diastolic and systolic blood
pressure)• New for 2019: Benefits, Linkage
The CHORDS Common Data Model: VDW
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• Many existing data sources rely on self-reported measures
• CHORDS uses EHR data, accessing measurements entered by providers
Enhancing Data Reliability
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• CHORDS provides aggregated data for use by public health agencies
• Information cannot be traced back to individual patients – limited data set
• Each data partner retains full control over their patients’ data – opt out model
Maintaining Patient Privacy
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NETWORK USES
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• Public Health– Retrospective surveillance
• Disease prevalence across demographic, geographic strata
• Adapters standardized for specific case definitions
• Healthcare Research– Infrastructure (governance, analytic support) for
internal/external research using CHORDS data
CHORDS Network Use
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Public Health and Research Requests
• Public Health Topics:• Depression• Mental Health and
Pregnancy• Hypertension• Diabetes• Adult/Child BMI• Tobacco Use• Opioid Use Disorder• Marijuana
• Research Topics:• Asthma Exacerbation
Index• Adolescent
Pregnancy and LARCs• Spinal Fusion
Procedures and Opioids
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Underlying Data
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Public Health Use Case:Depression Among the Latino Age Wave
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Research Use Case: Asthma
Absolute Eos. vs. % Eos.
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INNOVATION: CUSTOMIZING CHORDS
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Structured public health requests
• Menu-driven user interface• Small cell size suppression• Tailored reports• Enhancements for large numbers of records• Coverage
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Structured public health requests
• Menu-driven user interface• Small cell size suppression• Tailored reports• Enhancements for large numbers of records• Coverage
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Small cell size suppression
• Aligned with CMS Guidelines– Cell sizes ≤10 are replaced with ≤10 – This masking can be turned off for QA checks
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Structured public health requests
• Menu-driven user interface• Small cell size suppression• Tailored reports• Enhancements for large numbers of records• Coverage
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Structured public health requests
• Menu-driven user interface• Small cell size suppression• Tailored reports• Enhancements for large numbers of records• Coverage
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Enhancements for large numbers of records
• Change in file size of transmissions from DMC to Portal to minimize SQL Server space requirements
• Limiting displayed rows in Portal
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Structured public health requests
• Menu-driven user interface• Small cell size suppression• Tailored reports• Enhancements for large numbers of records• Coverage
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Customizing CHORDS
• Linking and de-duplicating records across data-contributing sites
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CHALLENGES
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Data Partners
• Legal/regulatory• Different technical resources
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Legal/Regulatory
• Unique processes at each site• Agreements required to share data
– Reciprocal DUA
• IRB approval: site by site considerations• Research vs. public health
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Data Partners
• Legal/regulatory• Different technical resources
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Different Technical Resources
• Full IT team vs. summer interns/part time assistance
• Software licensing considerations• Previous experience in other data networks
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Data Partners
• ETL (Extract, Transform and Load) challenges• QA efforts
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Data Partners: ETL
• Differing experience levels• Site-specific decisions• The mystery of the missing heights
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Data Partners
• ETL challenges• QA efforts
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Data Partners: QA
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**do not distribute.
Patient Volume Stratified by Age
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Data Partners: QA
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**do not distribute.
Pregnancy Lab Test Volume, 2005-2016
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WHERE WE ARE NOW AND WHERE WE ARE GOING
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Geographic Area• NOW:
– Metro Denver area
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Geographic Area• GOING TO:
– Northern Colorado/Front Range
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Data Partners• NOW:
– 12 data partners contributing data
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Data Partners
• GOING TO:– Adding new data partners, including two of the
largest state-wide systems. – Adding new behavioral health data partners– New outreach
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VDW
• NOW– CHORDS VDW 3.1– Assessed data model concordance with:
• HCSRN VDW CDM: 98%• PCORnet CDM: 47%
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VDW
• GOING TO:– Balance of specialized tables/fields vs. staying in
alignment: point of no return? – CHORDS VDW 3.2: BENEFITS and LINKAGE tables– Next up: Social Determinants, Screening?
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Software
• Customization: pros and cons• Keeping up with the Joneses (aka new
releases)• Help from the Harvard Pilgrim development
team
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Where Else?
• Linkage and de-duplication• Expanded Research Agenda
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Linkage and De-duplication
• We’ve got an eMPI… now what?– Distributed data network design– Which record “wins”
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Where Else?
• Linkage and de-duplication• Expanded Research Agenda
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Expanded Research Agenda
• Deep dive into newer tables• New fields, lab tests• Revisiting regulatory/legal processes at each
site
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Additional Resources Online
www.coloradohealthinstitute.org/research/colorado-health-observation-regional-data-service
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