ICD-10 · PDGM grouping
Q18 Other congenital malformations of face and neck
All 10 codes in the Q18 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
10
Can lead a claim
0
Cannot lead a claim
10
What CMS assigns to Q18
None of the 10 codes is assigned a clinical group. None of the 10 is assigned a comorbidity subgroup. None can lead a claim.
Every code in Q18
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 |
|---|---|---|---|---|
| Q18.0 | Sinus, fistula and cyst of branchial cleft | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| Q18.1 | Preauricular sinus and cyst | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| Q18.2 | Other branchial cleft malformations | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| Q18.3 | Webbing of neck | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| Q18.4 | Macrostomia | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| Q18.5 | Microstomia | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| Q18.6 | Macrocheilia | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| Q18.7 | Microcheilia | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| Q18.8 | Other specified congenital malformations of face and neck | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| Q18.9 | Congenital malformation of face and neck, 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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