ICD-10-CM 2027
ICD-10 code for H Constant Spring hemoglobin
From the official ICD-10-CM alphabetic index entry “Hemoglobin › H Constant Spring”. Page updated September 29, 2026.
About coding H Constant Spring hemoglobin
The ICD-10-CM code for H Constant Spring hemoglobin is D56.0 (Alpha thalassemia).
Within D56 (thalassemia), D56.0 is specifically for alpha thalassemia. Related codes cover beta thalassemia (D56.1), Delta-beta thalassemia (D56.2), minor (D56.3), hereditary persistence of fetal hemoglobin [HPFH] (D56.4), hemoglobin E-beta thalassemia (D56.5), other thalassemias (D56.8) and unspecified (D56.9).
Don't report D56.0 together with the conditions in its Excludes1 note: alpha thalassemia trait or minor (D56.3), asymptomatic alpha thalassemia (D56.3), hydrops fetalis due to isoimmunization (P56.0) and hydrops fetalis not due to immune hemolysis (P83.2).
Use an additional code, if applicable, for hydrops fetalis due to alpha thalassemia (P56.99).
Don't confuse with (Excludes1 for D56.0)
Common questions about H Constant Spring hemoglobin ICD-10 codes
What is the ICD-10 code for H Constant Spring hemoglobin?
- D56.0 — Alpha thalassemia.
Is D56.0 billable?
- Yes. D56.0 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can D56.0 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict D56.0 as a principal diagnosis.
Is D56.0 a CC or MCC?
- No. D56.0 is neither a CC nor an MCC under MS-DRG v44.0.