2026 ICD-10-CM Diagnosis Code C77.5Secondary and unspecified malignant neoplasm of intrapelvic lymph nodes

ICD-10-CM Codes›C00–D49›C76-C80›C77

ICD-10-CM C77.5
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

C77.5 is a billable ICD-10-CM diagnosis code for secondary and unspecified malignant neoplasm of intrapelvic 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
C77.5
Billable Status
Yes — Valid for Submission
Code Describes
Secondary and unspecified malignant neoplasm of intrapelvic lymph nodes
Short Description
Secondary and unsp malignant neoplasm of intrapelv 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 CodeC77.5Secondary and unspecified malignant neoplasm of intrapelvic lymph nodes

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Malignant neoplasm of parametrium
  • Metastasis to lymph node from adenocarcinoma
  • Metastatic adenocarcinoma to abdominal lymph node
  • Metastatic adenocarcinoma to pelvic lymph node
  • Metastatic carcinoma of abdominal lymph node
  • Metastatic carcinoma of pelvic lymph node
  • Metastatic malignant neoplasm to iliac lymph nodes
  • Metastatic malignant neoplasm to intrapelvic lymph nodes
  • Metastatic malignant neoplasm to obturator lymph nodes
  • Metastatic malignant neoplasm to parametrial lymph nodes
  • Metastatic malignant neoplasm to parametrium
  • Metastatic malignant neoplasm to pararectal lymph nodes
  • Metastatic malignant neoplasm to paravaginal lymph nodes
  • Metastatic malignant neoplasm to soft tissues of pelvis
  • Metastatic squamous cell carcinoma of pelvic lymph node
  • Metastatic squamous cell carcinoma to abdominal lymph node
  • Metastatic squamous cell carcinoma to lymph node
  • Neoplasm of obturator lymph nodes
  • Neoplasm of parametrial lymph nodes
  • Neoplasm of parametrium
  • Neoplasm of paravaginal lymph nodes

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) › hypogastric–C77.5–D36.0D48.7D49.89
lymph, lymphatic channel NEC › gland (secondary) › iliac–C77.5–D36.0D48.7D49.89
lymph, lymphatic channel NEC › gland (secondary) › intrapelvic–C77.5–D36.0D48.7D49.89
lymph, lymphatic channel NEC › gland (secondary) › obturator–C77.5–D36.0D48.7D49.89
lymph, lymphatic channel NEC › gland (secondary) › paracervical–C77.5–D36.0D48.7D49.89
lymph, lymphatic channel NEC › gland (secondary) › parametrial–C77.5–D36.0D48.7D49.89
lymph, lymphatic channel NEC › gland (secondary) › pelvic–C77.5–D36.0D48.7D49.89
lymph, lymphatic channel NEC › gland (secondary) › presymphysial–C77.5–D36.0D48.7D49.89
lymph, lymphatic channel NEC › gland (secondary) › sacral–C77.5–D36.0D48.7D49.89

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.

Convert C77.5 to ICD-9-CMHistory

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

ICD-9-CM
196.6 Mal neo lymph-intrapelv
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 C77.5Overview

Is C77.5 (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 intrapelvic lymph nodes on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does C77.5 group to?

When secondary and unspecified malignant neoplasm of intrapelvic 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 C77.5?

Under the General Equivalence Mappings, secondary and unspecified malignant neoplasm of intrapelvic lymph nodes converts to ICD-9-CM 196.6 (mal neo lymph-intrapelv). 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.