ICD-10 Code C03.9

Malignant neoplasm of gum, unspecified

Version 2019 Billable Code Neoplasm Malignant Primary
ICD-10: C03.9
Short Description:Malignant neoplasm of gum, unspecified
Long Description:Malignant neoplasm of gum, unspecified

Valid for Submission

ICD-10 C03.9 is a billable code used to specify a medical diagnosis of malignant neoplasm of gum, unspecified. The code is valid for the year 2019 for the submission of HIPAA-covered transactions.

Code Classification

  • Neoplasms (C00–D48)
    • Malignant neoplasms of lip, oral cavity and pharynx (C00-C14)
      • Malignant neoplasm of gum (C03)

Information for Medical Professionals

Convert C03.9 to ICD-9

The following crosswalk between ICD-10 to ICD-9 is based based on the General Equivalence Mappings (GEMS) information:

  • 143.8 - Malig neo gum NEC (Approximate Flag)
  • 143.9 - Malig neo gum NOS (Approximate Flag)


The following clinical terms are approximate synonyms:

  • Malignant epithelial neoplasm of alveolus dentalis
  • Malignant melanoma of gum
  • Malignant melanoma of oral cavity
  • Malignant neoplasm of alveolus dentalis
  • Malignant neoplasm of gum and contiguous sites
  • Malignant tumor of gum
  • Neoplasm of alveolar ridge mucosa
  • Primary malignant neoplasm of alveolar ridge mucosa
  • Primary malignant neoplasm of gingival mucosa
  • Primary malignant neoplasm of gum
  • Squamous cell carcinoma of gum
  • Squamous cell carcinoma of oral mucous membrane

Table of Neoplasms

The code C03.9 is included in the table of neoplasms by anatomical site. For each site there are six possible code numbers according to whether the neoplasm in question is malignant, benign, in situ, of uncertain behavior, or of unspecified nature. The description of the neoplasm will often indicate which of the six columns is appropriate.

Where such descriptors are not present, the remainder of the Index should be consulted where guidance is given to the appropriate column for each morphological (histological) variety listed. However, the guidance in the Index can be overridden if one of the descriptors mentioned above is present.

The Tabular must be reviewed for the complete diagnosis code.

Neoplasm, neoplastic Malignant
CaInSitu Benign Uncertain
  »ridge or process
  »ridge or process
»connective tissue NEC
»gingiva (alveolar) (marginal)
»interdental papillae
  »soft tissues
  »alveolar (ridge or process)
»periodontal tissue NEC
»tooth socket NEC

Information for Patients

Oral Cancer

Oral cancer can form in any part of the mouth. Most oral cancers begin in the flat cells that cover the surfaces of your mouth, tongue, and lips. Anyone can get oral cancer, but the risk is higher if you are male, use tobacco, drink lots of alcohol, have HPV, or have a history of head or neck cancer. Frequent sun exposure is also a risk factor for lip cancer.

Symptoms of oral cancer include

  • White or red patches in your mouth
  • A mouth sore that won't heal
  • Bleeding in your mouth
  • Loose teeth
  • Problems or pain with swallowing
  • A lump in your neck
  • An earache

Tests to diagnose oral cancer include a physical exam, endoscopy, biopsy, and imaging tests. Oral cancer treatments may include surgery, radiation therapy, and chemotherapy. Some patients have a combination of treatments.

NIH: National Cancer Institute

  • Leukoplakia (Medical Encyclopedia)
  • Oral cancer (Medical Encyclopedia)
  • Swallowing problems (Medical Encyclopedia)
  • Tongue biopsy (Medical Encyclopedia)
  • Understanding Chemotherapy - NIH - Easy-to-Read (National Cancer Institute)
  • What to Know about External Beam Radiation Therapy - NIH - Easy-to-Read (National Cancer Institute)

[Learn More]

ICD-10 Footnotes

General Equivalence Map Definitions
The ICD-10 and ICD-9 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.

  • Approximate Flag - The approximate flag is on, indicating that the relationship between the code in the source system and the code in the target system is an approximate equivalent.
  • No Map Flag - The no map flag indicates that a code in the source system is not linked to any code in the target system.
  • Combination Flag - The combination flag indicates that more than one code in the target system is required to satisfy the full equivalent meaning of a code in the source system.