ICD-10 · PDGM grouping
G56 Mononeuropathies of upper limb
All 28 codes in the G56 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
28
Can lead a claim
21
Cannot lead a claim
7
What CMS assigns to G56
21 of the 28 codes group to Neuro Rehabilitation; 7 are assigned no clinical group. None of the 28 is assigned a comorbidity subgroup. 21 of the 28 can lead a claim.
Every code in G56
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 |
|---|---|---|---|---|
| G56.0 Carpal tunnel syndrome | ||||
| G56.00 | Carpal tunnel syndrome, unspecified upper limb | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| G56.01 | Carpal tunnel syndrome, right upper limb | Can lead a claim | B | None |
| G56.02 | Carpal tunnel syndrome, left upper limb | Can lead a claim | B | None |
| G56.03 | Carpal tunnel syndrome, bilateral upper limbs | Can lead a claim | B | None |
| G56.1 Other lesions of median nerve | ||||
| G56.10 | Other lesions of median nerve, unspecified upper limb | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| G56.11 | Other lesions of median nerve, right upper limb | Can lead a claim | B | None |
| G56.12 | Other lesions of median nerve, left upper limb | Can lead a claim | B | None |
| G56.13 | Other lesions of median nerve, bilateral upper limbs | Can lead a claim | B | None |
| G56.2 Lesion of ulnar nerve | ||||
| G56.20 | Lesion of ulnar nerve, unspecified upper limb | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| G56.21 | Lesion of ulnar nerve, right upper limb | Can lead a claim | B | None |
| G56.22 | Lesion of ulnar nerve, left upper limb | Can lead a claim | B | None |
| G56.23 | Lesion of ulnar nerve, bilateral upper limbs | Can lead a claim | B | None |
| G56.3 Lesion of radial nerve | ||||
| G56.30 | Lesion of radial nerve, unspecified upper limb | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| G56.31 | Lesion of radial nerve, right upper limb | Can lead a claim | B | None |
| G56.32 | Lesion of radial nerve, left upper limb | Can lead a claim | B | None |
| G56.33 | Lesion of radial nerve, bilateral upper limbs | Can lead a claim | B | None |
| G56.4 Causalgia of upper limb | ||||
| G56.40 | Causalgia of unspecified upper limb | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| G56.41 | Causalgia of right upper limb | Can lead a claim | B | None |
| G56.42 | Causalgia of left upper limb | Can lead a claim | B | None |
| G56.43 | Causalgia of bilateral upper limbs | Can lead a claim | B | None |
| G56.8 Other specified mononeuropathies of upper limb | ||||
| G56.80 | Other specified mononeuropathies of unspecified upper limb | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| G56.81 | Other specified mononeuropathies of right upper limb | Can lead a claim | B | None |
| G56.82 | Other specified mononeuropathies of left upper limb | Can lead a claim | B | None |
| G56.83 | Other specified mononeuropathies of bilateral upper limbs | Can lead a claim | B | None |
| G56.9 Unspecified mononeuropathy of upper limb | ||||
| G56.90 | Unspecified mononeuropathy of unspecified upper limb | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| G56.91 | Unspecified mononeuropathy of right upper limb | Can lead a claim | B | None |
| G56.92 | Unspecified mononeuropathy of left upper limb | Can lead a claim | B | None |
| G56.93 | Unspecified mononeuropathy of bilateral upper limbs | Can lead a claim | B | 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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