Duffy phenotype

This code exists but cannot be submitted on its own. It groups the more specific codes beneath it.

A category header for its whole life, FY2025 onwards. It has never been valid for submission on its own.

Submit one of these 4 more specific codes instead:

• Z67.A1 Duffy null
• Z67.A2 Duffy a positive
• Z67.A3 Duffy b positive
• Z67.A4 Duffy a and b positive