2026 ICD-10-CM Diagnosis Code M84.58XAPathological fracture in neoplastic disease, other specified site, initial encounter for fracture

ICD-10-CM Codes›M00–M99›M80-M85›M84

ICD-10-CM M84.58XA
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M84.58XA is a billable ICD-10-CM diagnosis code for pathological fracture in neoplastic disease, other specified site, initial encounter for fracture. The 7th character A marks it as an initial encounter code, used while the patient is receiving active treatment. 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Conditions due to neoplasm or the treatment of neoplasm; and Pathological fracture, initial encounter.

Code Identity

ICD-10-CM Code
M84.58XA
Billable Status
Yes — Valid for Submission
Code Describes
Pathological fracture in neoplastic disease, other specified site, initial encounter for fracture
Short Description
Pathological fracture in neoplastic disease, oth site, init
Parent Code
M84.58
Pathological fracture in neoplastic disease, other specified site

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM80-M85Disorders of bone density and structure
CategoryM84Disorder of continuity of bone
This CodeM84.58XAPathological fracture in neoplastic disease, other specified site, initial encounter for fracture

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Malignant neoplasm of vertebra
  • Mass of thoracic vertebrae
  • Metastatic malignant neoplasm to vertebral column
  • Neoplasm of bone of sacrum
  • Neoplasm of cervical vertebra
  • Neoplasm of lumbar vertebra
  • Neoplasm of thoracic vertebra
  • Pathologic fracture of bone at site of metastatic neoplasm
  • Pathologic fracture of cervical vertebra at site of neoplasm
  • Pathologic fracture of lumbar vertebra at site of neoplasm
  • Pathologic fracture of pelvis at site of neoplasm
  • Pathologic fracture of sacral vertebra at site of neoplasm
  • Pathologic fracture of vertebra at site of metastatic neoplasm
  • Pathologic fracture of vertebra at site of neoplasm
  • Pathological fracture of cervical vertebra
  • Pathological fracture of lumbar vertebra
  • Pathological fracture of pelvis
  • Pathological fracture of sacral vertebra
  • Pathological fracture of thoracic vertebra
  • Pathological fracture of thoracic vertebra due to neoplastic disease
  • Pathological fracture of vertebra

Clinical ClassificationClinical

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

CCSR NEO074
Conditions due to neoplasm or the treatment of neoplasm
Default principal diagnosis: inpatient No · outpatient No
CCSR MUS014
Pathological fracture, initial encounter
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Fractures

A fracture is a break in a bone. Fractures are usually caused by injuries. Since they can sometimes be serious, it's important to get medical care right away if you think you have a fracture.

The full article covers:

  • What is a fracture?
  • What are the different types of fractures?
  • What causes fractures?
  • What are the symptoms of a fracture?
  • How are fractures diagnosed?
  • What are the treatments for fractures?
  • Can fractures be prevented?

Read the full article at MedlinePlus

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

Convert M84.58XA to ICD-9-CMHistory

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

ICD-9-CM
733.13 Path fx vertebrae
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 M84.58XAOverview

Is M84.58XA a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report pathological fracture in neoplastic disease, other specified site, initial encounter for fracture on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character A in M84.58XA mean?

The final character A marks the initial encounter: use it while the patient is receiving active treatment for pathological fracture in neoplastic disease, other specified site, such as an emergency visit or first evaluation.

What MS-DRG does M84.58XA group to?

When pathological fracture in neoplastic disease, other specified site, initial encounter for fracture 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 M84.58XA?

Under the General Equivalence Mappings, pathological fracture in neoplastic disease, other specified site, initial encounter for fracture converts to ICD-9-CM 733.13 (path fx vertebrae). 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.