Alphabetic Index FY2027

D56.0

Alpha thalassemia

FY2027Chapter 3: Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism/D55–D59 Hemolytic anemias

BillableComplete code, valid to report
Care settingsHome Health Primary · MMTA - Infectious Disease, Neoplasms, and Blood-Forming Diseases

D56.0 (also written D560) is a billable ICD-10-CM diagnosis code for alpha thalassemia. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 8 codes in category D56 (Thalassemia). The Alphabetic Index lists it under 8 entries. Its coding notes include a Use additional code instruction, 5 Excludes1 entries and 9 Excludes2 entries.

Use additional code

Add the listed code as a secondary code, if known.

This code
  • code, if applicable, for hydrops fetalis due to alpha thalassemia (P56.99)

Excludes1

Not coded here. The listed conditions generally should not be reported together.

This code
  • alpha thalassemia trait or minor (D56.3)
  • asymptomatic alpha thalassemia (D56.3)
  • hydrops fetalis due to isoimmunization (P56.0)
  • hydrops fetalis not due to immune hemolysis (P83.2)
Inherited from D56 Thalassemia
  • sickle-cell thalassemia (D57.4-)

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

Also from chapter/block level (9 notes)
Inherited from Chapter 3 Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism
  • autoimmune disease (systemic) NOS (M35.9)
  • certain conditions originating in the perinatal period (P00-P96)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • human immunodeficiency virus [HIV] disease (B20)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Care settings

How CMS programs treat this code. These are CMS claim edits and list entries, not coverage or eligibility rules.

Home Health Primary

Accepted as the primary (principal) diagnosis on a home health claim. The Home Health Grouper assigns it to the MMTA - Infectious Disease, Neoplasms, and Blood-Forming Diseases clinical group.

Source: CMS Home Health Grouper Software v07.2.26, effective October 1, 2026

Inclusion terms

Conditions classified to this code.

This code
  • Alpha thalassemia major
  • Hemoglobin H Constant Spring
  • Hemoglobin H disease
  • Hydrops fetalis due to alpha thalassemia
  • Severe alpha thalassemia
  • Triple gene defect alpha thalassemia

Alphabetic Index terms

Terms the official Alphabetic Index lists for this code. 8 entries