ICD-10 · PDGM grouping
Q20 Congenital malformations of cardiac chambers and connections
All 9 codes in the Q20 family, with the PDGM clinical group, comorbidity subgroup and primary-position rule CMS assigns, read from the CMS grouper crosswalk v07.2.26 and the CDC FY2027 code file.
Codes in family
9
Can lead a claim
8
Cannot lead a claim
1
What CMS assigns to Q20
8 of the 9 codes group to MMTA - Other; 1 is assigned no clinical group. None of the 9 is assigned a comorbidity subgroup. 8 of the 9 can lead a claim.
Every code in Q20
Descriptions are CDC’s FY2027 wording; where CMS’s grouper abbreviates one, its form is shown beneath.
| Code | Description | Primary position | Clinical group | Comorbidity subgroup |
|---|---|---|---|---|
| Q20.0 | Common arterial trunk | Can lead a claim | A | None |
| Q20.1 | Double outlet right ventricle | Can lead a claim | A | None |
| Q20.2 | Double outlet left ventricle | Can lead a claim | A | None |
| Q20.3 | Discordant ventriculoarterial connection | Can lead a claim | A | None |
| Q20.4 | Double inlet ventricle | Can lead a claim | A | None |
| Q20.5 | Discordant atrioventricular connection | Can lead a claim | A | None |
| Q20.6 | Isomerism of atrial appendages | Can lead a claim | A | None |
| Q20.8 | Other congenital malformations of cardiac chambers and connectionsCMS: Oth congenital malform of cardiac chambers and connections | Can lead a claim | A | None |
| Q20.9 | Congenital malformation of cardiac chambers and connections, unspecifiedCMS: Congenital malform of cardiac chambers and connections, unsp | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
Sources: CMS HH PPS Grouper Software v07.2.26, effective 2026-10-01, for the clinical group, comorbidity subgroup, code-first conventions and primary-position flags; CDC NCHS ICD-10-CM FY2027 code descriptions for the family title and code wording. This is the crosswalk Medicare runs a claim through. Grouping also depends on admission source, timing, the OASIS functional items and the rest of the diagnosis list.
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