ICD-10 · PDGM grouping
R90 Abnormal findings on diagnostic imaging of central nervous system
All 4 codes in the R90 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
4
Can lead a claim
0
Cannot lead a claim
4
What CMS assigns to R90
None of the 4 codes is assigned a clinical group. None of the 4 is assigned a comorbidity subgroup. None can lead a claim.
Every code in R90
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 |
|---|---|---|---|---|
| R90.0 | Intracranial space-occupying lesion found on diagnostic imaging of central nervous systemCMS: Intcrn space-occupying lesion found on dx imaging of cnsl | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| R90.8 Other abnormal findings on diagnostic imaging of central nervous system | ||||
| R90.81 | Abnormal echoencephalogram | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| R90.82 | White matter disease, unspecified | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| R90.89 | Other abnormal findings on diagnostic imaging of central nervous systemCMS: Oth abnormal findings on diagnostic imaging of cnsl | 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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