ICD-10 · PDGM grouping
G70 Myasthenia gravis and other myoneural disorders
All 8 codes in the G70 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
8
Can lead a claim
5
Cannot lead a claim
3
What CMS assigns to G70
5 of the 8 codes group to Neuro Rehabilitation; 3 are assigned no clinical group. None of the 8 is assigned a comorbidity subgroup. 5 of the 8 can lead a claim. CMS attaches a code-first note to 2 of the 8.
Code first
CMS grouper convention 8, on G70.1. Code first:
- , if applicable, toxic effects of substances chiefly nonmedicinal as to source (T51-T65)
CMS grouper convention 12, on G70.81. Code first:
- underlying disease
Every code in G70
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 |
|---|---|---|---|---|
| G70.0 Myasthenia gravis | ||||
| G70.00 | Myasthenia gravis without (acute) exacerbation | Can lead a claim | B | None |
| G70.01 | Myasthenia gravis with (acute) exacerbation | Can lead a claim | B | None |
| G70.1 | Toxic myoneural disorders | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| G70.2 | Congenital and developmental myasthenia | Can lead a claim | B | None |
| G70.8 Other specified myoneural disorders | ||||
| G70.80 | Lambert-Eaton syndrome, unspecified | Can lead a claim | B | None |
| G70.81 | Lambert-Eaton syndrome in disease classified elsewhere | Cannot lead a claimManifestation code is not reportable as principal diagnosis | None | None |
| G70.89 | Other specified myoneural disorders | Can lead a claim | B | None |
| G70.9 | Myoneural disorder, 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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