2026 ICD-10-CM Diagnosis Code C77Secondary and unspecified malignant neoplasm of lymph nodes

ICD-10-CM Codes›C00–D49›C76-C80›C77

ICD-10-CM C77
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

C77 is a non-billable ICD-10-CM category code for secondary and unspecified malignant neoplasm of lymph nodes, so it cannot be submitted on claims. Use a more specific code from this category instead, such as C77.0, C77.1, C77.2, and C77.3.

Code Identity

ICD-10-CM Code
C77
Billable Status
No — Non-Billable Category
Code Describes
Secondary and unspecified malignant neoplasm of lymph nodes
Short Description
Secondary and unspecified malignant neoplasm of lymph nodes
Same as the full description in the CMS dataset.
Chapter
C76-C80
Malignant neoplasms of ill-defined, other secondary and unspecified sites

Code Classification

ChapterC00–D49Neoplasms
SectionC76-C80Malignant neoplasms of ill-defined, other secondary and unspecified sites
CategoryC77Secondary and unspecified malignant neoplasm of lymph nodes
This CodeC77Secondary and unspecified malignant neoplasm of lymph nodes

Specific Coding for Secondary and unspecified malignant neoplasm of lymph nodesOverview

Non-specific codes like C77 require more characters. Use one of these billable codes instead:

  • Use C77.0 for Secondary and unspecified malignant neoplasm of lymph nodes of head, face and neck

  • Use C77.1 for Secondary and unspecified malignant neoplasm of intrathoracic lymph nodes

  • Use C77.2 for Secondary and unspecified malignant neoplasm of intra-abdominal lymph nodes

  • Use C77.3 for Secondary and unspecified malignant neoplasm of axilla and upper limb lymph nodes

  • Use C77.4 for Secondary and unspecified malignant neoplasm of inguinal and lower limb lymph nodes

  • Use C77.5 for Secondary and unspecified malignant neoplasm of intrapelvic lymph nodes

  • Use C77.8 for Secondary and unspecified malignant neoplasm of lymph nodes of multiple regions

  • Use C77.9 for Secondary and unspecified malignant neoplasm of lymph node, unspecified

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Type 1 Excludes

  • malignant neoplasm of lymph nodes, specified as primary C81 C86 C88 C96
  • mesentery metastasis of carcinoid tumor C7B.04
  • secondary carcinoid tumors of distant lymph nodes C7B.01

Patient EducationClinical

Cancer

Cancer is not just one disease but many diseases. Cancer begins in your cells, which are the building blocks of your body. Usually, your body forms new cells as needed, replacing old cells that die. Sometimes this process goes wrong. New cells grow even when you don't need them, and old cells don't die when they should.

The full article covers:

  • What is cancer?
  • What are the types of cancer?
  • How does cancer develop?
  • What are the symptoms of cancer?
  • How is cancer diagnosed?
  • What are the treatments for cancer?
  • Can cancer be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About C77Overview

Is C77 (Secondary and unspecified malignant neoplasm of lymph nodes) a billable code?

No. This is a category header that groups the codes for secondary and unspecified malignant neoplasm of lymph nodes, and headers cannot be submitted on claims. Claims for secondary and unspecified malignant neoplasm of lymph nodes need a more specific code from this category, such as C77.0, C77.1, and C77.2.