2026 ICD-10-CM Diagnosis Code C22.9Malignant neoplasm of liver, not specified as primary or secondary

ICD-10-CM Codes›C00–D49›C15-C26›C22

ICD-10-CM C22.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

C22.9 is a billable ICD-10-CM diagnosis code for malignant neoplasm of liver, not specified as primary or secondary. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 435 through 437. Coders also document this condition as adenocarcinoma of liver. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Gastrointestinal cancers - liver.

Code Identity

ICD-10-CM Code
C22.9
Billable Status
Yes — Valid for Submission
Code Describes
Malignant neoplasm of liver, not specified as primary or secondary
Short Description
Malig neoplasm of liver, not specified as primary or sec
Parent Code
C22
Malignant neoplasm of liver and intrahepatic bile ducts

Code Classification

ChapterC00–D49Neoplasms
SectionC15-C26Malignant neoplasms of digestive organs
CategoryC22Malignant neoplasm of liver and intrahepatic bile ducts
This CodeC22.9Malignant neoplasm of liver, not specified as primary or secondary

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Adenocarcinoma of liver
  • Adenocarcinoma of liver and intrahepatic biliary tract
  • Local recurrence of malignant neoplasm of liver
  • Lymphoma of liver
  • Malignant neoplasm of liver
  • Primary carcinosarcoma of liver

Clinical ClassificationClinical

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

CCSR NEO017
Gastrointestinal cancers - liver
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.
hepatic [See Also: Index to disease, by histology]C22.9C78.7D01.5D13.4D37.6D49.0
liver [See Also: Index to disease, by histology]C22.9C78.7D01.5D13.4D37.6D49.0

Patient EducationClinical

Liver Cancer

Your liver is the largest organ inside your body. It helps your body digest food, store energy, and remove poisons. Primary liver cancer starts in the liver. Metastatic liver cancer starts somewhere else and spreads to your liver.

The full article covers:

  • What is Liver Cancer?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert C22.9 to ICD-9-CMHistory

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

ICD-9-CM
155.2 Malignant neo liver NOS
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 C22.9Overview

Is C22.9 (Malignant neoplasm of liver and intrahepatic bile ducts) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report malignant neoplasm of liver, not specified as primary or secondary on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does C22.9 group to?

When malignant neoplasm of liver, not specified as primary or secondary is the principal diagnosis on an inpatient stay, it groups to MS-DRG 435, 436, 437, with relative weights from 0.8533 to 1.8367 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of C22.9?

Under the General Equivalence Mappings, malignant neoplasm of liver, not specified as primary or secondary converts to ICD-9-CM 155.2 (malignant neo liver NOS). 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.