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C39.9

C39.9Malignant neoplasm of lower respiratory tract, part unspecified

Billable / specific codeICD-10-CM

C39.9 is a billable, specific ICD-10-CM code for malignant neoplasm of lower respiratory tract, part unspecified. It is valid for submission on a claim.

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

  • Malignant neoplasm of respiratory tract NOS

Risk adjustment

C39.9 risk-adjusts. Under the CMS-HCC V28 model it maps to this category:

  • HCC 21 Lymphoma and Other Cancers0.671 RAF

Coefficient shown for the Community Non-dual Aged segment. A higher HCC in the same hierarchy will suppress this one, so capturing it does not always add score.

Medicare coverage

C39.9 is named in 41 Medicare coverage policies 41 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

  • A52479Oral Anticancer Drugs - Policy Article
  • A52479Oral Anticancer Drugs - Policy Article
  • A52480Oral Antiemetic Drugs (Replacement for Intravenous Antiemetics) - Policy Article
  • A55315Billing and Coding: Proton Beam Therapy

Related codes at this level

Codes that share C39. If C39.9 is not quite right, the correct code is usually one of these.

Questions about C39.9

Is C39.9 a billable ICD-10-CM code?
Yes. C39.9 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does C39.9 sit in the tabular list?
Neoplasms (C00-D49), in the block Malignant neoplasms of respiratory and intrathoracic organs (C30-C39).
ICD-10-CMFY2026-Apr· effective April 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release — see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.