2024 ICD-10-CM Diagnosis Code D47.09

Other mast cell neoplasms of uncertain behavior

ICD-10-CM Code:
ICD-10 Code for:
Other mast cell neoplasms of uncertain behavior
Is Billable?
Yes - Valid for Submission
Chronic Condition Indicator: [1]
Not chronic
Code Navigator:

Code Classification

  • Neoplasms
    • Neoplasms of uncertain behavior, polycythemia vera and myelodysplastic syndromes
      • Other neoplasms of uncertain behavior of lymphoid, hematopoietic and related tissue

D47.09 is a billable diagnosis code used to specify a medical diagnosis of other mast cell neoplasms of uncertain behavior. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2023 through September 30, 2024.

Approximate Synonyms

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

  • Localized extracutaneous mastocytosis
  • Mast cell disorder
  • Mast cell neoplasm
  • Mastocytoma
  • Systemic mast cell disease

Clinical Classification

Clinical Information

  • Mast-Cell Sarcoma

    a unifocal malignant tumor that consists of atypical pathological mast cells without systemic involvement. it causes local destructive growth in organs other than in skin or bone marrow.
  • Mastocytoma

    a solid tumor consisting of a dense infiltration of mast cells. it is generally benign.
  • Mastocytoma, Skin

    a variant of cutaneous mastocytosis which occurs as a single lesion usually in infants. it is found mostly in the wrist and trunk and there is no atypical cytomorphology.
  • Mast Cells

    granulated cells that are found in almost all tissues, most abundantly in the skin and the gastrointestinal tract. like the basophils, mast cells contain large amounts of histamine and heparin. unlike basophils, mast cells normally remain in the tissues and do not circulate in the blood. mast cells, derived from the bone marrow stem cells, are regulated by the stem cell factor.

Tabular List of Diseases and Injuries

The following annotation back-references are applicable to this diagnosis code. The Tabular List of Diseases and Injuries is a list of ICD-10-CM codes, organized "head to toe" into chapters and sections with coding notes and guidance for inclusions, exclusions, descriptions and more.

Inclusion Terms

Inclusion Terms
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
  • Extracutaneous mastocytoma
  • Mast cell tumor NOS
  • Mastocytoma NOS
  • Mastocytosis NOS

Index to Diseases and Injuries References

The following annotation back-references for this diagnosis code are found in the injuries and diseases index. The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10-CM code(s).

  • - Tumor - See Also: Neoplasm, unspecified behavior, by site;

Replacement Code

D4709 replaces the following previously assigned ICD-10-CM code(s):

  • D47.0 - Histiocytic and mast cell tumors of uncertain behavior
  • D47.0 - Mast cell neoplasms of uncertain behavior

Convert D47.09 to ICD-9-CM

  • ICD-9-CM Code: 238.5 - Mastocytoma NOS
    Approximate Flag - The approximate mapping means there is not an exact match between the ICD-10 and ICD-9 codes and the mapped code is not a precise representation of the original code.

Code History

  • FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • 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


[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.