October 1 update. Our PDGM and ICD-10 tools now use the FY2027 code set: 190 codes added, 30 deleted, and no existing code changed clinical group.

See what changed

ICD-10 · PDGM grouping

G05 Encephalitis, myelitis and encephalomyelitis in diseases classified elsewhere

All 2 codes in the G05 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.

ICD-10-CM FY2027 · CMS grouper v07.2.26

Codes in family

2

Can lead a claim

0

Cannot lead a claim

2

What CMS assigns to G05

None of the 2 codes is assigned a clinical group. None of the 2 is assigned a comorbidity subgroup. None can lead a claim. CMS attaches a code-first note to all 2.

Code first

CMS grouper convention 31, on all 2 codes. Code first:

  • congenital toxoplasmosis encephalitis, myelitis and encephalomyelitis (P37.1)
  • cytomegaloviral encephalitis, myelitis and encephalomyelitis (B25.8)
  • encephalitis, myelitis and encephalomyelitis (in) systemic lupus erythematosus (M32.19)
  • eosinophilic meningoencephalitis (B83.2)
  • human immunodeficiency virus [HIV] disease (B20)
  • poliovirus (A80.-)
  • suppurative otitis media (H66.01-H66.4)
  • systemic lupus erythematosus (M32.19)
  • trichinellosis (B75)
  • underlying disease
  • underlying disease, such as:

Every code in G05

Descriptions are CDC’s FY2027 wording; where CMS’s grouper abbreviates one, its form is shown beneath.

CodeDescriptionPrimary positionClinical groupComorbidity subgroup
G05.3Encephalitis and encephalomyelitis in diseases classified elsewhereCMS: Encephalitis and encephalomyelitis in diseases classd elswhrCannot lead a claimManifestation code is not reportable as principal diagnosisNoneNone
G05.4Myelitis in diseases classified elsewhereCannot lead a claimManifestation code is not reportable as principal diagnosisNoneNone

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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