ICD-10 · PDGM grouping
R50 Fever of other and unknown origin
All 6 codes in the R50 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
6
Can lead a claim
0
Cannot lead a claim
6
What CMS assigns to R50
None of the 6 codes is assigned a clinical group. None of the 6 is assigned a comorbidity subgroup. None can lead a claim. CMS attaches a code-first note to 1 of the 6.
Code first
CMS grouper convention 160, on R50.81. Code first:
- leukemia (C91-C95)
- neutropenia (D70.-)
- sickle-cell disease (D57.-)
- underlying condition when associated fever is present, such as with:
Every code in R50
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 |
|---|---|---|---|---|
| R50.2 | Drug induced fever | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| R50.8 Other specified fever | ||||
| R50.81 | Fever presenting with conditions classified elsewhere | Cannot lead a claimManifestation code is not reportable as principal diagnosis | None | None |
| R50.82 | Postprocedural fever | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| R50.83 | Postvaccination fever | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| R50.84 | Febrile nonhemolytic transfusion reaction | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| R50.9 | Fever, unspecified | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | 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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