ICD-10 · PDGM grouping
R83 Abnormal findings in cerebrospinal fluid
All 9 codes in the R83 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
9
Can lead a claim
0
Cannot lead a claim
9
What CMS assigns to R83
None of the 9 codes is assigned a clinical group. None of the 9 is assigned a comorbidity subgroup. None can lead a claim.
Every code in R83
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 |
|---|---|---|---|---|
| R83.0 | Abnormal level of enzymes in cerebrospinal fluid | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| R83.1 | Abnormal level of hormones in cerebrospinal fluid | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| R83.2 | Abnormal level of other drugs, medicaments and biological substances in cerebrospinal fluidCMS: Abn lev drug/meds/biol subst in cerebrospinal fluid | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| R83.3 | Abnormal level of substances chiefly nonmedicinal as to source in cerebrospinal fluidCMS: Abn lev substances chiefly nonmedicinal as to source in CSF | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| R83.4 | Abnormal immunological findings in cerebrospinal fluid | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| R83.5 | Abnormal microbiological findings in cerebrospinal fluid | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| R83.6 | Abnormal cytological findings in cerebrospinal fluid | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| R83.8 | Other abnormal findings in cerebrospinal fluid | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| R83.9 | Unspecified abnormal finding in cerebrospinal fluid | 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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