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

A48 Other bacterial diseases, not elsewhere classified

All 8 codes in the A48 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

8

Can lead a claim

8

Cannot lead a claim

0

What CMS assigns to A48

All 8 codes group to MMTA - Infectious Disease, Neoplasms, and Blood-Forming Diseases (6) and Wound (2). 1 of the 8 counts toward the Whooping Cough and Pneumonia comorbidity subgroup; 7 are assigned none. Every code can lead a claim.

  • Whooping Cough and Pneumonia: counts toward the high comorbidity tier only in an interaction pair.

Every code in A48

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

CodeDescriptionPrimary positionClinical groupComorbidity subgroup
A48.0Gas gangreneCan lead a claimCNone
A48.1Legionnaires' diseaseCan lead a claimKWhooping Cough and Pneumonia
A48.2Nonpneumonic Legionnaires' disease [Pontiac fever]Can lead a claimKNone
A48.3Toxic shock syndromeCan lead a claimKNone
A48.4Brazilian purpuric feverCan lead a claimKNone
A48.5 Other specified botulism
A48.51Infant botulismCan lead a claimKNone
A48.52Wound botulismCan lead a claimCNone
A48.8Other specified bacterial diseasesCan lead a claimKNone

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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