ICD-10 · PDGM grouping
Q26 Congenital malformations of great veins
All 9 codes in the Q26 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
9
Cannot lead a claim
0
What CMS assigns to Q26
All 9 codes group to MMTA - Other. None of the 9 is assigned a comorbidity subgroup. Every code can lead a claim.
Every code in Q26
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 |
|---|---|---|---|---|
| Q26.0 | Congenital stenosis of vena cava | Can lead a claim | A | None |
| Q26.1 | Persistent left superior vena cava | Can lead a claim | A | None |
| Q26.2 | Total anomalous pulmonary venous connection | Can lead a claim | A | None |
| Q26.3 | Partial anomalous pulmonary venous connection | Can lead a claim | A | None |
| Q26.4 | Anomalous pulmonary venous connection, unspecified | Can lead a claim | A | None |
| Q26.5 | Anomalous portal venous connection | Can lead a claim | A | None |
| Q26.6 | Portal vein-hepatic artery fistula | Can lead a claim | A | None |
| Q26.8 | Other congenital malformations of great veins | Can lead a claim | A | None |
| Q26.9 | Congenital malformation of great vein, unspecified | Can lead a claim | A | 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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