ICD-10 · PDGM grouping
G51 Facial nerve disorders
All 10 codes in the G51 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
8
Cannot lead a claim
2
What CMS assigns to G51
8 of the 10 codes group to Neuro Rehabilitation; 2 are assigned no clinical group. None of the 10 is assigned a comorbidity subgroup. 8 of the 10 can lead a claim.
Every code in G51
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 |
|---|---|---|---|---|
| G51.0 | Bell's palsy | Can lead a claim | B | None |
| G51.1 | Geniculate ganglionitis | Can lead a claim | B | None |
| G51.2 | Melkersson's syndrome | Can lead a claim | B | None |
| G51.3 Clonic hemifacial spasm | ||||
| G51.31 | Clonic hemifacial spasm, right | Can lead a claim | B | None |
| G51.32 | Clonic hemifacial spasm, left | Can lead a claim | B | None |
| G51.33 | Clonic hemifacial spasm, bilateral | Can lead a claim | B | None |
| G51.39 | Clonic hemifacial spasm, unspecified | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| G51.4 | Facial myokymia | Can lead a claim | B | None |
| G51.8 | Other disorders of facial nerve | Can lead a claim | B | None |
| G51.9 | Disorder of facial nerve, 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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