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ICD-10-CM 2027

ICD-10 code for phenotype

Choose a code from the options below based on the documentation.

From the official ICD-10-CM alphabetic index entry “Phenotype”. Page updated September 29, 2026.

About coding phenotype

The official ICD-10-CM index doesn't give a single default code for phenotype; the code depends on the details below.

More specific phenotype codes (official index)

  • Duffy
  • a positive Z67.A2 — Duffy a positive
  • a and b positive Z67.A4 — Duffy a and b positive
  • b positive Z67.A3 — Duffy b positive
  • Fy (a+b-) Z67.A2 — Duffy a positive
  • Fy (a-b-) Z67.A1 — Duffy null
  • Fy (a-b+) Z67.A3 — Duffy b positive
  • Fy (a+b+) Z67.A4 — Duffy a and b positive
  • null Z67.A1 — Duffy null