Z67.A2 Duffy a positive

Billable ICD-10-CM code, FY2026. Exempt from present-on-admission (POA) reporting.

Applicable to

• Duffy phenotype Fy(a+b-)

MS-DRG index

Defines the logic of DRG(s) 951 in MDC 23.

Medicare Code Edits (MCE v43.1 (April 2026))

• Unacceptable principal diagnosis: These codes describe a circumstance which influences care but is not a current illness or injury, or capture only an underlying condition, and are unacceptable as principal diagnosis.

Diagnosis Index entries for Z67.A2

• Phenotype › Duffy › a positive
• Phenotype › Duffy › Fy (a+b-)

Nearby codes

• Z67.9 Unspecified blood type
• Z67.90 Unspecified blood type, Rh positive
• Z67.91 Unspecified blood type, Rh negative
• Z67.A Duffy phenotype
• Z67.A1 Duffy null
• Z67.A2 Duffy a positive (this code)
• Z67.A3 Duffy b positive
• Z67.A4 Duffy a and b positive