ICD-10-CM 2027
ICD-10 code for Rh incompatibility
From the official ICD-10-CM alphabetic index entry “Incompatibility › Rh (blood group) (factor)”. Page updated September 29, 2026.
About coding Rh incompatibility
The ICD-10-CM code for Rh incompatibility is Z31.82 (Encounter for Rh incompatibility status). The official index lists 3 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on Z31.82.
Within Z31.8 (encounter for other procreative management), Z31.82 is specifically for encounter for Rh incompatibility status. Related codes cover male factor infertility in female patient (Z31.81), assisted reproductive fertility procedure cycle (Z31.83), fertility preservation procedure (Z31.84) and other procreative management (Z31.89).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 951 (Other Factors Influencing Health Status, relative weight 0.5577), in MDC 23 (Factors Influencing Health Status and Other Contacts with Health Services), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific Rh incompatibility codes (official index)
Common questions about Rh incompatibility ICD-10 codes
What is the ICD-10 code for Rh incompatibility?
- Z31.82 — Encounter for Rh incompatibility status. More specific codes apply when the documentation supports them: O36.09, O36.01, P55.0.
What is the ICD-10 code for newborn rh incompatibility?
- P55.0 — Rh isoimmunization of newborn.
Is Z31.82 billable?
- Yes. Z31.82 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can Z31.82 be used as a principal diagnosis?
- No. It is not acceptable as the principal diagnosis for an inpatient stay; it may be reported as a secondary diagnosis.
Is Z31.82 a CC or MCC?
- No. Z31.82 is neither a CC nor an MCC under MS-DRG v44.0.