D56.4Billable

Hereditary persistence of fetal hemoglobin [HPFH]

Chapter
3. Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism
Category
D56
Effective date
October 1, 2026

Related codes in category D56

D56ThalassemiaD56.0Alpha thalassemiaYesD56.1Beta thalassemiaYesD56.2Delta-beta thalassemiaYesD56.3Thalassemia minorYesD56.5Hemoglobin E-beta thalassemiaYesD56.8Other thalassemiasYesD56.9Thalassemia, unspecifiedYes

Frequently asked questions

What is ICD-10 code D56.4?

D56.4 is an ICD-10-CM diagnosis code for Hereditary persistence of fetal hemoglobin [HPFH].

Is D56.4 a billable code?

Yes. D56.4 is billable and specific enough to be used on a claim.

What ICD-10-CM chapter is D56.4 in?

D56.4 falls under Chapter 3: Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism.

When did D56.4 become effective?

D56.4 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.

What other codes are related to D56.4?

D56.4 belongs to category D56, which includes 8 other codes — see the related codes list on this page.

ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.