2026 ICD-10-CM Diagnosis Code C77.8Secondary and unspecified malignant neoplasm of lymph nodes of multiple regions

ICD-10-CM Codes›C00–D49›C76-C80›C77

ICD-10-CM C77.8
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

C77.8 is a billable ICD-10-CM diagnosis code for secondary and unspecified malignant neoplasm of lymph nodes of multiple regions. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 820 through 825, 840 through 842. Coders also document this condition as metastasis to lymph node from adenocarcinoma. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Secondary malignancies.

Code Identity

ICD-10-CM Code
C77.8
Billable Status
Yes — Valid for Submission
Code Describes
Secondary and unspecified malignant neoplasm of lymph nodes of multiple regions
Short Description
Sec and unsp malig neoplasm of nodes of multiple regions
Parent Code
C77
Secondary and unspecified malignant neoplasm of lymph nodes

Code Classification

ChapterC00–D49Neoplasms
SectionC76-C80Malignant neoplasms of ill-defined, other secondary and unspecified sites
CategoryC77Secondary and unspecified malignant neoplasm of lymph nodes
This CodeC77.8Secondary and unspecified malignant neoplasm of lymph nodes of multiple regions

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Metastasis to lymph node from adenocarcinoma
  • Metastatic adenocarcinoma of lymph nodes of multiple sites
  • Metastatic malignant neoplasm to lymph nodes of multiple sites
  • Metastatic malignant neoplasm to multiple lymph nodes
  • Metastatic squamous cell carcinoma to lymph node
  • Metastatic squamous cell carcinoma to lymph nodes of multiple sites

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR NEO070
Secondary malignancies
Default principal diagnosis: inpatient Yes · outpatient Yes

Table of NeoplasmsClinical

Anatomical sites in the Table of Neoplasms that reference this code family.

SiteMalig.
Primary		Malig.
Secondary		Ca
in situ		BenignUncertainUnspec.
lymph, lymphatic channel NEC › gland (secondary) › multiple sites in categories C77.0 - C77.5–C77.8–D36.0D48.7D49.89

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Convert C77.8 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
196.8 Mal neo lymph node-mult
Exact Match The mapping is direct, with no qualifiers.

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 C77.8Overview

Is C77.8 (Secondary and unspecified malignant neoplasm of lymph nodes) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report secondary and unspecified malignant neoplasm of lymph nodes of multiple regions on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does C77.8 group to?

When secondary and unspecified malignant neoplasm of lymph nodes of multiple regions is the principal diagnosis on an inpatient stay, it groups to MS-DRG 820, 821, 822, 823, 824, 825, 840, 841, 842, with relative weights from 1.0104 to 5.8648 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of C77.8?

Under the General Equivalence Mappings, secondary and unspecified malignant neoplasm of lymph nodes of multiple regions converts to ICD-9-CM 196.8 (mal neo lymph node-mult). The mapping is a direct match.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.