cqframework/clinical_quality_language

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Clinical Quality Language (CQL) is an HL7 specification for the expression of clinical knowledge that can be used within both the Clinical Decision Support (CDS) and Clinical Quality Measurement (CQM) domains. This repository contains complementary tooling in support of that specification.

Stars: 330
Forks: 147
Open beginner issues: 0
Indexed issues: 238
Avg merge: 5d 5h
Merged PRs (30d): 6

Dominant language: Kotlin
License: Apache-2.0
Last GitHub push: Sep 17, 2026
Latest indexed: Sep 20, 2026
Contributing guide: No contributing guide
Code of conduct: Code of conduct
Beginner labels: help wanted

Beginner friendly Everything

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238 open issues indexed

Consider adding a warning for unused dependencies Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 48/100

cqframework/clinical_quality_language#1845 · Opened Sep 19, 2026
ModelInfo baseCanonical uses targetUrl instead of model-specific url Open

bug md impact tracking

Difficulty 4/5 3-5 days Newbie friendliness 48/100

cqframework/clinical_quality_language#1842 · Opened Sep 16, 2026
@cqframework/cql: TrackBack locator fields are Kotlin/JS-mangled that change between releases Open

Difficulty 4/5 3-5 days Newbie friendliness 58/100

cqframework/clinical_quality_language#1841 · Opened Sep 15, 2026
Intervals of Integer, Decimal and Time are returned as CQL text instead of FHIR.Range / FHIR.Period Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 68/100

cqframework/clinical_quality_language#1832 · Opened Aug 26, 2026
5.2.0: function resolution and casting fail for a choice of profiles that all derive from the declaring type (3.27.0 accepts; blocks current CMS QICore/USQC content) Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

cqframework/clinical_quality_language#1831 · Opened Aug 26, 2026
ELM JSON loading: default (empty) compiler options serialize to a null translatorOptions annotation, which compilerOptionsMatch treats as a mismatch Open

cqframework/clinical_quality_language#1828 · 1 assignee · Opened Aug 18, 2026
Add to community projects Open

enhancement

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

cqframework/clinical_quality_language#1818 · 1 reaction · Opened Jul 31, 2026
Split does not handle empty separator or empty-string input as expected Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

cqframework/clinical_quality_language#1811 · Opened Jul 10, 2026
Feature request: enhanced error handling in cql-to-elm-cli Open

enhancement

Difficulty 3/5 1-2 days Newbie friendliness 55/100

cqframework/clinical_quality_language#1810 · Opened Jul 10, 2026
ClassCastException in cql-to-elm-cli when using modelinfo Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 74/100

cqframework/clinical_quality_language#1803 · Opened Jul 8, 2026
FHIR ModelInfo should expose typed choice accessors so .effectiveDateTime works alongside .effective.ofType(dateTime) Open

enhancement

cqframework/clinical_quality_language#1801 · 1 assignee · Opened Jul 8, 2026
DateTime + Integer (no time unit) should be a compile-time type error, not a runtime InvalidPrecision exception Open

bug

cqframework/clinical_quality_language#1800 · 1 assignee · Opened Jul 8, 2026
Choice-type overloads missing on Exists / Empty / Count; is on absent choice field returns empty and propagates Open

bug

cqframework/clinical_quality_language#1799 · 1 assignee · Opened Jul 8, 2026
FHIRPath union of string literals translates to Union(String, String), which has no CQL overload Open

bug

cqframework/clinical_quality_language#1798 · 1 assignee · Opened Jul 8, 2026
Point from Interval[null, null] is returning null instead of erroring Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 68/100

cqframework/clinical_quality_language#1794 · Opened Jul 7, 2026
Probe: engine 5.0.0 evaluating FHIR CQL over kotlin-fhir (no HAPI) — and the missing DataProvider Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

cqframework/clinical_quality_language#1791 · 2 comments · Opened Jul 3, 2026
Difference in weeks calculating incorrectly Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 68/100

cqframework/clinical_quality_language#1788 · Opened Jun 17, 2026
ucum units incorrectly converting when multiplying Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 50/100

cqframework/clinical_quality_language#1773 · Opened Jun 3, 2026
expand Interval of Dates is returning intervals of DateTime Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 65/100

cqframework/clinical_quality_language#1770 · Opened May 29, 2026
@cqframework/cql: subpath exports ship .mjs with no "types", so CqlTranslator methods (e.g. toJson) aren't visible to consumers Open

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

cqframework/clinical_quality_language#1768 · 9 comments · Opened May 27, 2026
Date/DateTime add/subtract behavior Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 48/100

cqframework/clinical_quality_language#1767 · Opened May 17, 2026
CqlDateTime Operators does not handle precision correctly Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 58/100

cqframework/clinical_quality_language#1766 · Opened May 7, 2026
DateTime Operator "Add" for year and weeks treating 52 weeks as a calendar year Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 55/100

cqframework/clinical_quality_language#1765 · Opened May 7, 2026
CqlComparisonOperatorsTest "groupName": "Unit Comparison" have many failures Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 55/100

cqframework/clinical_quality_language#1763 · Opened May 6, 2026
In R4 system.long is being handled incorrectly Open

Difficulty 3/5 1-2 days Newbie friendliness 65/100

cqframework/clinical_quality_language#1750 · Opened Apr 24, 2026
Collapse a list of Intervals returns an array instead of a list Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

cqframework/clinical_quality_language#1744 · Opened Apr 17, 2026
DataRequirementsProcessor produces duplicate cqf-logicDefinition extensions Open

bug

cqframework/clinical_quality_language#1738 · 1 assignee · Opened Apr 7, 2026
Expression Tuple equivalence on tuples with mismatched number of items does not return false Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

cqframework/clinical_quality_language#1735 · Opened Apr 3, 2026
Operation Split('a,b', null) should return null, but returns a valueString Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

cqframework/clinical_quality_language#1728 · Opened Apr 2, 2026
Operation Split('a,b', '-') should return a list, but returns a valueString Open

Difficulty 3/5 1-2 days Newbie friendliness 58/100

cqframework/clinical_quality_language#1727 · Opened Apr 2, 2026
"days between" operation on DateTime with Uncertain Interval returns string instead of interval Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

cqframework/clinical_quality_language#1725 · Opened Apr 2, 2026
Uncertainty interval with "months between" operation returns wrong low interval Open

Difficulty 3/5 1-2 days Newbie friendliness 72/100

cqframework/clinical_quality_language#1724 · Opened Apr 2, 2026
Distinct operation on a list with all nulls does not return a list but a single null Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

cqframework/clinical_quality_language#1723 · Opened Apr 2, 2026
Sort Dates Asc and Desc operations do not preserve time (and desc) Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

cqframework/clinical_quality_language#1722 · Opened Apr 2, 2026
Except Time List and Except DateTime List return single instead of a list Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

cqframework/clinical_quality_language#1719 · Opened Apr 2, 2026
Negation handling with US Quality Core Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

cqframework/clinical_quality_language#1714 · Opened Apr 1, 2026
Milliseconds are read incorrectly from time and date time literals Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

cqframework/clinical_quality_language#1702 · 1 comment · Opened Mar 12, 2026
Loading libraries from intermediary forms Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

cqframework/clinical_quality_language#1700 · 1 comment · Opened Mar 9, 2026
Issue with unit conversion Open

md impact tracking

cqframework/clinical_quality_language#1690 · 7 comments · 1 assignee · Opened Feb 25, 2026
Bug in the precision of "day of" interval calculation Open

md impact tracking

cqframework/clinical_quality_language#1678 · 3 comments · 1 assignee · Opened Feb 18, 2026
CQL build has circular dependencies Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

cqframework/clinical_quality_language#1677 · Opened Feb 12, 2026
@cqframework/cql should include model files and CQL helper code Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

cqframework/clinical_quality_language#1672 · Opened Jan 28, 2026
JavaScript @cqframework/cql LibraryManager needs UCUM documentation and examples Open

Difficulty 2/5 1-3 hours Newbie friendliness 48/100

cqframework/clinical_quality_language#1671 · Opened Jan 28, 2026
JavaScript CQL validation result types are obfuscated Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

cqframework/clinical_quality_language#1670 · Opened Jan 28, 2026
@cqframework/cql NPMjs package does not include type declarations. Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

cqframework/clinical_quality_language#1669 · Opened Jan 27, 2026
Add cqf-resourceType extension to relatedArtifact entries Open

enhancement

cqframework/clinical_quality_language#1665 · 1 assignee · Opened Jan 15, 2026
Code casting to list error expected Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

cqframework/clinical_quality_language#1657 · 1 comment · Opened Dec 15, 2025
Capture evaluation warnings and infos separately Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 45/100

cqframework/clinical_quality_language#1652 · Opened Dec 8, 2025
identifier hiding warning may not be working Open

input needed

Difficulty 3/5 1-2 days Newbie friendliness 45/100

cqframework/clinical_quality_language#1651 · 2 comments · Opened Dec 4, 2025
Duplicate fluent function definitions is not an error Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 45/100

cqframework/clinical_quality_language#1643 · Opened Nov 16, 2025

cqframework/clinical_quality_language

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