2026 ICD-10-CM Diagnosis Code C77.2Secondary and unspecified malignant neoplasm of intra-abdominal lymph nodes

ICD-10-CM Codes›C00–D49›C76-C80›C77

ICD-10-CM C77.2
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

C77.2 is a billable ICD-10-CM diagnosis code for secondary and unspecified malignant neoplasm of intra-abdominal lymph nodes. 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Secondary malignancies.

Code Identity

ICD-10-CM Code
C77.2
Billable Status
Yes — Valid for Submission
Code Describes
Secondary and unspecified malignant neoplasm of intra-abdominal lymph nodes
Short Description
Secondary and unsp malignant neoplasm of intra-abd nodes
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 CodeC77.2Secondary and unspecified malignant neoplasm of intra-abdominal lymph nodes

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Metastasis to lymph node from adenocarcinoma
  • Metastatic adenocarcinoma to abdominal lymph node
  • Metastatic carcinoma of abdominal lymph node
  • Metastatic malignant neoplasm to hypogastric lymph nodes
  • Metastatic malignant neoplasm to intestinal lymph nodes
  • Metastatic malignant neoplasm to intra-abdominal lymph nodes
  • Metastatic malignant neoplasm to intrapelvic lymph nodes
  • Metastatic malignant neoplasm to mesenteric lymph nodes
  • Metastatic malignant neoplasm to retroperitoneal lymph nodes
  • Metastatic squamous cell carcinoma to abdominal lymph node
  • Metastatic squamous cell carcinoma to lymph node

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) › abdominal–C77.2–D36.0D48.7D49.89
lymph, lymphatic channel NEC › gland (secondary) › aortic–C77.2–D36.0D48.7D49.89
lymph, lymphatic channel NEC › gland (secondary) › celiac–C77.2–D36.0D48.7D49.89
lymph, lymphatic channel NEC › gland (secondary) › colic–C77.2–D36.0D48.7D49.89
lymph, lymphatic channel NEC › gland (secondary) › common duct–C77.2–D36.0D48.7D49.89
lymph, lymphatic channel NEC › gland (secondary) › gastric–C77.2–D36.0D48.7D49.89
lymph, lymphatic channel NEC › gland (secondary) › hepatic–C77.2–D36.0D48.7D49.89
lymph, lymphatic channel NEC › gland (secondary) › hilar (pulmonary) › splenic–C77.2–D36.0D48.7D49.89
lymph, lymphatic channel NEC › gland (secondary) › ileocolic–C77.2–D36.0D48.7D49.89
lymph, lymphatic channel NEC › gland (secondary) › intestinal–C77.2–D36.0D48.7D49.89
lymph, lymphatic channel NEC › gland (secondary) › intrabdominal–C77.2–D36.0D48.7D49.89
lymph, lymphatic channel NEC › gland (secondary) › lumbar–C77.2–D36.0D48.7D49.89
lymph, lymphatic channel NEC › gland (secondary) › mesenteric (inferior) (superior)–C77.2–D36.0D48.7D49.89
lymph, lymphatic channel NEC › gland (secondary) › midcolic–C77.2–D36.0D48.7D49.89
lymph, lymphatic channel NEC › gland (secondary) › pancreatic–C77.2–D36.0D48.7D49.89
lymph, lymphatic channel NEC › gland (secondary) › para-aortic–C77.2–D36.0D48.7D49.89
lymph, lymphatic channel NEC › gland (secondary) › peri-aortic–C77.2–D36.0D48.7D49.89
lymph, lymphatic channel NEC › gland (secondary) › peripancreatic–C77.2–D36.0D48.7D49.89
lymph, lymphatic channel NEC › gland (secondary) › porta hepatis–C77.2–D36.0D48.7D49.89
lymph, lymphatic channel NEC › gland (secondary) › portal–C77.2–D36.0D48.7D49.89
lymph, lymphatic channel NEC › gland (secondary) › pyloric–C77.2–D36.0D48.7D49.89
lymph, lymphatic channel NEC › gland (secondary) › retroperitoneal–C77.2–D36.0D48.7D49.89
lymph, lymphatic channel NEC › gland (secondary) › splenic (hilar)–C77.2–D36.0D48.7D49.89

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Convert C77.2 to ICD-9-CMHistory

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

ICD-9-CM
196.2 Mal neo lymph intra-abd
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 C77.2Overview

Is C77.2 (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 intra-abdominal lymph nodes on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does C77.2 group to?

When secondary and unspecified malignant neoplasm of intra-abdominal lymph nodes 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 C77.2?

Under the General Equivalence Mappings, secondary and unspecified malignant neoplasm of intra-abdominal lymph nodes converts to ICD-9-CM 196.2 (mal neo lymph intra-abd). 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.