ICD-10 · PDGM grouping
B01 Varicella [chickenpox]
All 7 codes in the B01 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
7
Can lead a claim
7
Cannot lead a claim
0
What CMS assigns to B01
All 7 codes group to MMTA - Infectious Disease, Neoplasms, and Blood-Forming Diseases (4) and Neuro Rehabilitation (3). None of the 7 is assigned a comorbidity subgroup. Every code can lead a claim.
Every code in B01
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 |
|---|---|---|---|---|
| B01.0 | Varicella meningitis | Can lead a claim | B | None |
| B01.1 Varicella encephalitis, myelitis and encephalomyelitis | ||||
| B01.11 | Varicella encephalitis and encephalomyelitis | Can lead a claim | B | None |
| B01.12 | Varicella myelitis | Can lead a claim | B | None |
| B01.2 | Varicella pneumonia | Can lead a claim | K | None |
| B01.8 Varicella with other complications | ||||
| B01.81 | Varicella keratitis | Can lead a claim | K | None |
| B01.89 | Other varicella complications | Can lead a claim | K | None |
| B01.9 | Varicella without complication | Can lead a claim | K | 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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