ICD-10 · PDGM grouping
P56 Hydrops fetalis due to hemolytic disease
All 3 codes in the P56 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
3
Can lead a claim
2
Cannot lead a claim
1
What CMS assigns to P56
2 of the 3 codes group to MMTA - Other; 1 is assigned no clinical group. None of the 3 is assigned a comorbidity subgroup. 2 of the 3 can lead a claim.
Every code in P56
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 |
|---|---|---|---|---|
| P56.0 | Hydrops fetalis due to isoimmunization | Can lead a claim | A | None |
| P56.9 Hydrops fetalis due to other and unspecified hemolytic disease | ||||
| P56.90 | Hydrops fetalis due to unspecified hemolytic disease | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| P56.99 | Hydrops fetalis due to other hemolytic disease | Can lead a claim | A | 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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