2022 ICD-10-CM Code C96.21

Aggressive systemic mastocytosis

Version 2021

Valid for Submission

ICD-10:C96.21
Short Description:Aggressive systemic mastocytosis
Long Description:Aggressive systemic mastocytosis

Code Classification

  • Neoplasms (C00–D48)
    • Malignant neoplasms of lymphoid, hematopoietic and related tissue (C81-C96)
      • Oth & unsp malig neoplm of lymphoid, hematpoetc and rel tiss (C96)

C96.21 is a billable diagnosis code used to specify a medical diagnosis of aggressive systemic mastocytosis. The code C96.21 is valid during the fiscal year 2022 from October 01, 2021 through September 30, 2022 for the submission of HIPAA-covered transactions.

The ICD-10-CM code C96.21 might also be used to specify conditions or terms like aggressive lymphadenopathic mastocytosis with eosinophilia, aggressive systemic mastocytosis, malignant white blood cell disorder, systemic mast cell disease or systemic mast cell disease.

Index to Diseases and Injuries

The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10 code(s). The following references for the code C96.21 are found in the index:

Approximate Synonyms

The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

Clinical Information

Replacement Code

C9621 replaces the following previously assigned ICD-10 code(s):

Convert C96.21 to ICD-9 Code

The General Equivalency Mapping (GEM) crosswalk indicates an approximate mapping between the ICD-10 code C96.21 its ICD-9 equivalent. The approximate mapping means there is not an exact match between the ICD-10 code and the ICD-9 code and the mapped code is not a precise representation of the original code.

Code History

  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018