ICD-10-CM 2027
ICD-10 code for Indolent systemic mastocytosis
From the official ICD-10-CM alphabetic index entry “Mastocytosis › indolent systemic”. Page updated September 29, 2026.
About coding Indolent systemic mastocytosis
The ICD-10-CM code for Indolent systemic mastocytosis is D47.02 (Systemic mastocytosis).
Within D47.0 (mast cell neoplasms of uncertain behavior), D47.02 is specifically for systemic mastocytosis. Related codes cover cutaneous mastocytosis (D47.01) and other mast cell neoplasms of uncertain behavior (D47.09).
Don't report D47.02 together with the conditions in its Excludes1 note: aggressive systemic mastocytosis (C96.21) and mast cell leukemia (C94.3-).
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
Don't confuse with (Excludes1 for D47.02)
Common questions about Indolent systemic mastocytosis ICD-10 codes
What is the ICD-10 code for Indolent systemic mastocytosis?
- D47.02 — Systemic mastocytosis.
Is D47.02 billable?
- Yes. D47.02 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can D47.02 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict D47.02 as a principal diagnosis.
Is D47.02 a CC or MCC?
- D47.02 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.