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Home / ICD-10-CM / Chapter 2: Neoplasms (C00-D49) / Malignant neoplasms of ill-defined, other secondary and unspecified sites (C76-C80)

C79.83: Secondary malignant neoplasm of oral cavity

ICD-10-CM code C79.83

New code ยท FY2027

Billable: use this code on claims.

  • New code, effective October 1, 2026 (FY2027). Before that, this condition was coded as C79.89.

Code breakdown

C79.83

  1. C79CategorySecondary malignant neoplasm of other and unspecified sites
  2. 8Character 4Secondary malignant neoplasm of other specified sites
  3. 3Character 5Secondary malignant neoplasm of oral cavity

Coding notes

Excludes1 (from C79)

  • secondary carcinoid tumors (C7B.-)
  • secondary neuroendocrine tumors (C7B.-)

Medicare coverage

C79.83 is listed as a covered diagnosis in 7 Medicare billing and coding articles:

  • A56621 Billing and Coding: Swallowing Studies for Dysphagia
  • A56695 Billing and Coding: Implantable Infusion Pump
  • A56729 Billing and Coding: Magnetic Resonance Imaging of the Head and Neck
  • A56867 Billing and Coding: Genomic Sequence Analysis Panels in the Treatment of Solid Organ Neoplasms
  • A57788 Billing and Coding: Peripheral Nerve Blocks
  • A58982 Billing and Coding: Erythropoiesis Stimulating Agents
  • A59350 Billing and Coding: Radiation Therapies

Check this code

All FY2027 ICD-10-CM changes

ICD-10-CM codes and descriptions are from the CMS and NCHS code files. Coverage is from the CMS Medicare Coverage Database billing and coding articles.