ICD-10 · PDGM grouping
Q07 Other congenital malformations of nervous system
All 6 codes in the Q07 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
6
Can lead a claim
5
Cannot lead a claim
1
What CMS assigns to Q07
5 of the 6 codes group to Neuro Rehabilitation; 1 is assigned no clinical group. None of the 6 is assigned a comorbidity subgroup. 5 of the 6 can lead a claim.
Every code in Q07
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 |
|---|---|---|---|---|
| Q07.0 Arnold-Chiari syndrome | ||||
| Q07.00 | Arnold-Chiari syndrome without spina bifida or hydrocephalus | Can lead a claim | B | None |
| Q07.01 | Arnold-Chiari syndrome with spina bifida | Can lead a claim | B | None |
| Q07.02 | Arnold-Chiari syndrome with hydrocephalus | Can lead a claim | B | None |
| Q07.03 | Arnold-Chiari syndrome with spina bifida and hydrocephalus | Can lead a claim | B | None |
| Q07.8 | Other specified congenital malformations of nervous system | Can lead a claim | B | None |
| Q07.9 | Congenital malformation of nervous system, unspecified | 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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