2026 ICD-10-CM Diagnosis Code C76.1Malignant neoplasm of thorax

ICD-10-CM Codes›C00–D49›C76-C80›C76

ICD-10-CM C76.1
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

C76.1 is a billable ICD-10-CM diagnosis code for malignant neoplasm of thorax. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 180 through 182. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Cancer of other sites.

Code Identity

ICD-10-CM Code
C76.1
Billable Status
Yes — Valid for Submission
Code Describes
Malignant neoplasm of thorax
Short Description
Malignant neoplasm of thorax
Same as the full description in the CMS dataset.
Parent Code
C76
Malignant neoplasm of other and ill-defined sites

Code Classification

ChapterC00–D49Neoplasms
SectionC76-C80Malignant neoplasms of ill-defined, other secondary and unspecified sites
CategoryC76Malignant neoplasm of other and ill-defined sites
This CodeC76.1Malignant neoplasm of thorax

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Abdominothoracic neuroblastoma
  • Malignant melanoma of axilla
  • Malignant melanoma of chest wall
  • Malignant melanoma of shoulder
  • Malignant neoplasm of axilla
  • Malignant neoplasm of chest wall
  • Malignant neoplasm of thoracic cavity structure
  • Malignant neoplasm of thorax
  • Primary abdominothoracic neuroblastoma
  • Primary adenocarcinoma of chest wall
  • Primary malignant neoplasm of axilla
  • Primary malignant neoplasm of chest wall
  • Primary malignant neoplasm of intrathoracic organs
  • Primary neuroblastoma
  • Primary rhabdomyosarcoma of intrathoracic organ
  • Primary rhabdomyosarcoma of thorax
  • Primary sarcoma of axilla
  • Primary squamous cell carcinoma of intrathoracic organ
  • Primary synovial sarcoma
  • Primary synovial sarcoma of intrathoracic organ
  • Primary thoracic neuroblastoma
  • Primary undifferentiated large cell malignancy of chest wall
  • Synovial sarcoma
  • Thoracic neuroblastoma

Tabular List NotesGuidance

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

Inclusion Terms

  • Intrathoracic malignant neoplasm NOS
  • Malignant neoplasm of axilla NOS
  • Thoracic malignant neoplasm NOS

Clinical ClassificationClinical

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

CCSR NEO069
Cancer of other sites
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.
axilla, axillaryC76.1C79.89D09.8D36.7D48.7D49.89
chest (wall) NECC76.1C79.89D09.8D36.7D48.7D49.89
infraclavicular (region)C76.1C79.89D04.5D36.7D48.7D49.89
intrathoracic (cavity) (organs)C76.1C79.89D09.8D15.9D48.7D49.89
intrathoracic (cavity) (organs) › specified NECC76.1C79.89D09.8D15.7––
scapular regionC76.1C79.89D09.8D36.7D48.7D49.89
thorax, thoracic (cavity) (organs NEC)C76.1C79.89D09.8D36.7D48.7D49.89
thorax, thoracic (cavity) (organs NEC) › wall NECC76.1C79.89D09.8D36.7D48.7D49.89

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 C76.1 to ICD-9-CMHistory

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

ICD-9-CM
195.1 Malign neopl thorax
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 C76.1Overview

Is C76.1 (Malignant neoplasm of other and ill-defined sites) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report malignant neoplasm of thorax on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does C76.1 group to?

When malignant neoplasm of thorax is the principal diagnosis on an inpatient stay, it groups to MS-DRG 180, 181, 182, with relative weights from 0.7440 to 1.7660 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of C76.1?

Under the General Equivalence Mappings, malignant neoplasm of thorax converts to ICD-9-CM 195.1 (malign neopl thorax). 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.