ICD-10-CM · Chapter 3 · D50–D89
D89.43
Secondary mast cell activation
Diseases of the blood and immune mechanism
Quick facts
- Code
- D89.43
- Type
- Billable code
- ICD-10-CM chapter
- Chapter 3 — Diseases of the blood and immune mechanism
- Category
- D89 — Other disorders involving the immune mechanism, not elsewhere classified
- Specificity
- 5 characters
How coders use this code
ICD-10-CM D89.43 is a billable, fully specified code, so it can be reported directly on a claim to document a diagnosis of secondary mast cell activation. Coders assign it when the chart documentation supports this level of detail, always matching to the most specific code available and verifying against the chapter-specific guidelines published annually by NCHS/CMS.
Related codes in D89
- D89Other disorders involving the immune mechanism, not elsewhere classified
- D89.0Polyclonal hypergammaglobulinemia
- D89.1Cryoglobulinemia
- D89.2Hypergammaglobulinemia, unspecified
- D89.3Immune reconstitution syndrome
- D89.4Mast cell activation syndrome and related disorders
- D89.40Mast cell activation, unspecified
- D89.41Monoclonal mast cell activation syndrome
- D89.42Idiopathic mast cell activation syndrome
- D89.44Hereditary alpha tryptasemia
- D89.49Other mast cell activation disorder
- D89.8Other specified disorders involving the immune mechanism, not elsewhere classified
- D89.81Graft-versus-host disease
- D89.810Acute graft-versus-host disease
- D89.811Chronic graft-versus-host disease
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