ICD-10-CM 2027
ICD-10 code for consanguinity
From the official ICD-10-CM alphabetic index entry “Consanguinity”. Page updated September 29, 2026.
About coding consanguinity
The ICD-10-CM code for consanguinity is Z84.3 (Family history of consanguinity). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on Z84.3.
Within Z84 (family history of other conditions), Z84.3 is specifically for family history of consanguinity. Related codes cover diseases of the skin and subcutaneous tissue (Z84.0), disorders of kidney and ureter (Z84.1), other diseases of the genitourinary system (Z84.2), other specified conditions (Z84.8) and exposure to diethylstilbestrol (Z84.A).
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 consanguinity codes (official index)
- counseling Z71.89 — Other specified counseling
Common questions about consanguinity ICD-10 codes
What is the ICD-10 code for consanguinity?
- Z84.3 — Family history of consanguinity. More specific codes apply when the documentation supports them: Z71.89.
What is the ICD-10 code for counseling consanguinity?
- Z71.89 — Other specified counseling.
Is Z84.3 billable?
- Yes. Z84.3 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can Z84.3 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 Z84.3 a CC or MCC?
- No. Z84.3 is neither a CC nor an MCC under MS-DRG v44.0.