All ICD10 Codes
C77Not billable, use a more specific code below

Secondary and unspecified malignant neoplasm of lymph nodes

In Malignant neoplasms of ill-defined, other secondary and unspecified sites (C76-C80), chapter 2: Neoplasms

8 billable codes under C77: all are a CC; all map to HCC 18 (Cancer Metastatic to Bone, Other and Unspecified Metastatic Cancer; Acute Leukemia Except Myeloid), HCC 17 (Cancer Metastatic to Lung, Liver, Brain, and Other Organs; Acute Myeloid Leukemia Except Promyelocytic), HCC 20 (Lung and Other Severe Cancers).A CC or MCC (major CC) is a secondary diagnosis that raises the MS-DRG payment. An HCC counts toward a Medicare Advantage patient's risk score.

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Instructional notes

Excludes1: not coded here, use a different code

  • 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)

Official coding guidelines

From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.

Other Chapter 2 topics:

Read Section I.C.2 (page 32), 11 more topics

All codes under C77

C77 can't be used on a claim. Pick a billable code below; grey headings group them.

C77 MS-DRGs

As the principal diagnosis, the billable codes under C77 group to these 9 MS-DRGs (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.

Other codes that refer to C77

Notes on these codes point to C77.

  • C81-C96 Excludes2: secondary and unspecified neoplasm of lymph nodes (C77.-)
  • Z85.89 Includes: Conditions classifiable to C7A.098, C76, C77-C79

About the condition

Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.

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. These extra cells can form a mass called a tumor.

Read more about cancer on MedlinePlus

Code history

Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.