ICD-10 · PDGM grouping
B26 Mumps
All 11 codes in the B26 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
11
Can lead a claim
11
Cannot lead a claim
0
What CMS assigns to B26
All 11 codes group to MMTA - Infectious Disease, Neoplasms, and Blood-Forming Diseases (8) and Neuro Rehabilitation (3). None of the 11 is assigned a comorbidity subgroup. Every code can lead a claim.
Every code in B26
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 |
|---|---|---|---|---|
| B26.0 | Mumps orchitis | Can lead a claim | K | None |
| B26.1 | Mumps meningitis | Can lead a claim | B | None |
| B26.2 | Mumps encephalitis | Can lead a claim | B | None |
| B26.3 | Mumps pancreatitis | Can lead a claim | K | None |
| B26.8 Mumps with other complications | ||||
| B26.81 | Mumps hepatitis | Can lead a claim | K | None |
| B26.82 | Mumps myocarditis | Can lead a claim | K | None |
| B26.83 | Mumps nephritis | Can lead a claim | K | None |
| B26.84 | Mumps polyneuropathy | Can lead a claim | B | None |
| B26.85 | Mumps arthritis | Can lead a claim | K | None |
| B26.89 | Other mumps complications | Can lead a claim | K | None |
| B26.9 | Mumps 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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