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

G99 Other disorders of nervous system in diseases classified elsewhere

All 3 codes in the G99 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

3

Can lead a claim

0

Cannot lead a claim

3

What CMS assigns to G99

None of the 3 codes is assigned a clinical group. 1 of the 3 counts toward the Nondiabetic neuropathy comorbidity subgroup; 2 are assigned none. None can lead a claim. CMS attaches a code-first note to all 3.

  • Nondiabetic neuropathy: counts toward the high comorbidity tier only in an interaction pair.

Code first

CMS grouper convention 9, on G99.2. Code first:

  • neoplasm (C00-D49)

CMS grouper convention 45, on G99.0. Code first:

  • amyloidosis (E85.-)
  • gout (M1A.-, M10.-)
  • hyperthyroidism (E05.-)
  • underlying disease, such as:

CMS grouper convention 46, on G99.8. Code first:

  • amyloidosis (E85.-)
  • avitaminosis (E56.-)
  • underlying disorder, such as:

Every code in G99

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

CodeDescriptionPrimary positionClinical groupComorbidity subgroup
G99.0Autonomic neuropathy in diseases classified elsewhereCannot lead a claimManifestation code is not reportable as principal diagnosisNoneNondiabetic neuropathy
G99.2Myelopathy in diseases classified elsewhereCannot lead a claimManifestation code is not reportable as principal diagnosisNoneNone
G99.8Other specified disorders of nervous system in diseases classified elsewhereCMS: Oth disrd of nervous system 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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