2026 ICD-10-CM Diagnosis Code C79.52Secondary malignant neoplasm of bone marrow

ICD-10-CM Codes›C00–D49›C76-C80›C79

ICD-10-CM C79.52
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

C79.52 is a billable ICD-10-CM diagnosis code for secondary malignant neoplasm of bone marrow. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 456 through 458, 542 through 544. Coders also document this condition as metastatic malignant neoplasm to bone marrow. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Secondary malignancies.

Code Identity

ICD-10-CM Code
C79.52
Billable Status
Yes — Valid for Submission
Code Describes
Secondary malignant neoplasm of bone marrow
Short Description
Secondary malignant neoplasm of bone marrow
Same as the full description in the CMS dataset.
Parent Code
C79.5
Secondary malignant neoplasm of bone and bone marrow

Code Classification

ChapterC00–D49Neoplasms
SectionC76-C80Malignant neoplasms of ill-defined, other secondary and unspecified sites
CategoryC79Secondary malignant neoplasm of other and unspecified sites
This CodeC79.52Secondary malignant neoplasm of bone marrow

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Metastatic malignant neoplasm to bone marrow

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.
bone (periosteum) › marrow NEC (any bone)C96.9C79.52––D47.9D49.89
marrow (bone) NECC96.9C79.52––D47.9D49.89
spine, spinal (column) › marrow NECC96.9C79.52––D47.9D49.89
vertebra (column) › marrow NECC96.9C79.52––D47.9D49.89

Patient EducationClinical

Bone Marrow Diseases

Bone marrow is the spongy tissue inside some of your bones, such as your hip and thigh bones. It contains stem cells. The stem cells can develop into the red blood cells that carry oxygen through your body, the white blood cells that fight infections, and the platelets that help with blood clotting.

Read the full article at MedlinePlus

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

Convert C79.52 to ICD-9-CMHistory

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

ICD-9-CM
198.5 Secondary malig neo bone
Approximate The match is approximate rather than exact.

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 C79.52Overview

Is C79.52 (Secondary malignant neoplasm of bone and bone marrow) a billable code?

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

What MS-DRG does C79.52 group to?

When secondary malignant neoplasm of bone marrow is the principal diagnosis on an inpatient stay, it groups to MS-DRG 456, 457, 458, 542, 543, 544, with relative weights from 0.7546 to 8.4034 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of C79.52?

Under the General Equivalence Mappings, secondary malignant neoplasm of bone marrow converts to ICD-9-CM 198.5 (secondary malig neo bone). The mapping is approximate, so confirm the match fits the documentation.

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.