Specific code 2014 ICD-9-CM Diagnosis Code 238.5
Neoplasm of uncertain behavior of histiocytic and mast cells
  • Billable Code
  • Short description: Mastocytoma NOS.
  • ICD-9-CM 238.5 will be replaced by an equivalent ICD-10-CM code (or codes) when the United States transitions from ICD-9-CM to ICD-10-CM on October 1, 2015.
  • ICD-9-CM 238.5 is a billable medical code that can be used to specify a diagnosis on a reimbursement claim.
Disease Synonyms
  • Mastocytoma
  • Neoplasm of uncertain behavior, histiocytic or mas
  • Neoplasm of uncertain behavior, histiocytic or mast cell
Clinical Information
  • A heterogeneous group of disorders characterized by the abnormal growth and accumulation of mast cells in one or more organ systems. Recent data suggest that most variants of mastocytosis are clonal disorders. (who, 2001)
  • A localized tumor composed of sheets of mast cells without atypia. It includes the cutaneous mastocytoma which involves the dermis and subcutaneous tissue, and the extracutaneous mastocytoma. Most cases of extracutaneous mastocytoma have been reported in the lung.
  • A nodule of mast cells. Mastocytomas can involve the skin, subcutaneous tissue, and sometimes muscle. Also called a mast cell tumor.
  • Nodular cutaneous mast cell infiltrate, which is usually present at birth or soon after as a solitary nodule, although three to four lesions may occur; lesions typical of urticaria pigmentosa may occur later.
Applies To
  • Mast cell tumor NOS
  • Mastocytoma NOS
Convert to ICD-10-CM: 238.5 converts directly to:
  • 2014 ICD-10-CM D47.0 Histiocytic and mast cell tumors of uncertain behavior
ICD-9-CM Volume 2 Index entries containing back-references to 238.5:
  • Mast cell
    • tumor (M9740/1) 238.5
      • malignant (M9740/3) 202.6
  • Mastocytoma (M9740/1) 238.5
    • malignant (M9740/3) 202.6
  • Tumor (M8000/1) - see also Neoplasm, by site, unspecified nature
    • mast cell (M9740/1) 238.5
      • malignant (M9740/3) 202.6
ICD-9-CM codes are used in medical billing and coding to describe diseases, injuries, symptoms and conditions. ICD-9-CM 238.5 is one of thousands of ICD-9-CM codes used in healthcare. Although ICD-9-CM and CPT codes are largely numeric, they differ in that CPT codes describe medical procedures and services. Can't find a code? Start at the root of ICD-9-CM, check the 2014 ICD-9-CM Index or use the search engine at the top of this page to lookup any code.