Is ICD-10-CM code C78.31 billable?

Yes, C78.31 (Secondary malignant neoplasm of larynx) is a billable ICD-10-CM diagnosis code, valid for reimbursement on HIPAA-covered transactions for FY2027.

What chapter does ICD-10-CM code C78.31 belong to?

C78.31 belongs to Chapter 2 of the ICD-10-CM tabular list: C00–D49 (Neoplasms).

Is C78.31 a new ICD-10-CM code for 2027?

Yes, C78.31 was added or revised in the FY2027 ICD-10-CM update, effective October 1, 2026, as published by the Centers for Medicare and Medicaid Services (CMS).

C78.31BillableCCNew for FY2027

Secondary malignant neoplasm of larynx

Neoplasms·Secondary malignant neoplasm of other and unspecified respiratory organs·subcategory·FY 2027

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Instructional notes

Also applies, from C78: Secondary malignant neoplasm of respiratory and digestive organs

These notes sit on C78 and apply to every code under it, including C78.31.

Excludes1: not coded here, use a different code

secondary carcinoid tumors of liver (C7B.02)
secondary carcinoid tumors of peritoneum (C7B.04)

Excludes2: not included here, code separately if applicable

lymph node metastases (C77.0)

Where C78.31 sits

C76-C80 Malignant neoplasms of ill-defined, other secondary and unspecified sites (C76-C80)
C78 Secondary malignant neoplasm of respiratory and digestive organs
C78.3 Secondary malignant neoplasm of other and unspecified respiratory organs
C78.31 Secondary malignant neoplasm of larynx

MS-DRGs

As the principal diagnosis, this code groups to these MS-DRGs (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.

Code history

FY 2026: replaced C78.39 (Secondary malignant neoplasm of other respiratory organs)