2017/18 ICD-10-CM Diagnosis Code D89.42

Idiopathic mast cell activation syndrome

The following code(s) above D89.42 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to D89.42:
  • D50-D89
    2018 ICD-10-CM Range D50-D89

    Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism

    Type 2 Excludes
    • 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)
    Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism
  • D80-D89
    2018 ICD-10-CM Range D80-D89

    Certain disorders involving the immune mechanism

    Includes
    • defects in the complement system
    • immunodeficiency disorders, except human immunodeficiency virus [HIV] disease
    • sarcoidosis
    Type 1 Excludes
    • autoimmune disease (systemic) NOS (M35.9)
    • functional disorders of polymorphonuclear neutrophils (D71)
    • human immunodeficiency virus [HIV] disease (B20)
    Certain disorders involving the immune mechanism
  • D89
    ICD-10-CM Diagnosis Code D89

    Other disorders involving the immune mechanism, not elsewhere classified

      2016 2017 2018 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • hyperglobulinemia NOS (R77.1)
    • monoclonal gammopathy (of undetermined significance) (D47.2)
    Type 2 Excludes
    • transplant failure and rejection (T86.-)
    Other disorders involving the immune mechanism, not elsewhere classified
  • D89.4
    ICD-10-CM Diagnosis Code D89.4

    Mast cell activation syndrome and related disorders

      2017 - New Code 2018 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • aggressive systemic mastocytosis (C96.21)
    • congenital cutaneous mastocytosis (Q82.2)
    • (non-congenital) cutaneous mastocytosis (D47.01)
    • (indolent) systemic mastocytosis (D47.02)
    • malignant mast cell neoplasm (C96.2-)
    • malignant mastocytoma (C96.29)
    • mast cell leukemia (C94.3-)
    • mast cell sarcoma (C96.22)
    • mastocytoma NOS (D47.09)
    • other mast cell neoplasms of uncertain behavior (D47.09)
    • systemic mastocytosis associated with a clonal hematologic non-mast cell lineage disease (SM-AHNMD) (D47.02)
    Mast cell activation syndrome and related disorders
ICD-10-CM D89.42 is grouped within Diagnostic Related Group(s) (MS-DRG v35.0):

Convert D89.42 to ICD-9-CM

Code History

Diagnosis Index entries containing back-references to D89.42:

ICD-10-CM Codes Adjacent To D89.42
D86.89 Sarcoidosis of other sites
D86.9 Sarcoidosis, unspecified
D89 Other disorders involving the immune mechanism, not elsewhere classified
D89.0 Polyclonal hypergammaglobulinemia
D89.1 Cryoglobulinemia
D89.2 Hypergammaglobulinemia, unspecified
D89.3 Immune reconstitution syndrome
D89.4 Mast cell activation syndrome and related disorders
D89.40 Mast cell activation, unspecified
D89.41 Monoclonal mast cell activation syndrome
D89.42 Idiopathic mast cell activation syndrome
D89.43 Secondary mast cell activation
D89.49 Other mast cell activation disorder
D89.8 Other specified disorders involving the immune mechanism, not elsewhere classified
D89.81 Graft-versus-host disease
D89.810 Acute graft-versus-host disease
D89.811 Chronic graft-versus-host disease
D89.812 Acute on chronic graft-versus-host disease
D89.813 …… unspecified
D89.82 Autoimmune lymphoproliferative syndrome [ALPS]
D89.89 Other specified disorders involving the immune mechanism, not elsewhere classified

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.