2026 ICD-10-CM Diagnosis Code M84.575SPathological fracture in neoplastic disease, left foot, sequela

ICD-10-CM Codes›M00–M99›M80-M85›M84

ICD-10-CM M84.575S
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M84.575S is a billable ICD-10-CM diagnosis code for pathological fracture in neoplastic disease, left foot, sequela. The 7th character S marks it as a sequela code, which reports a problem that remains after the original condition has resolved. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 559 through 561. Coders also document this condition as pathological fracture of left foot. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Pathological, stress and atypical fractures, sequela.

Code Identity

ICD-10-CM Code
M84.575S
Billable Status
Yes — Valid for Submission
Code Describes
Pathological fracture in neoplastic disease, left foot, sequela
Short Description
Path fracture in neoplastic disease, left foot, sequela
Parent Code
M84.575
Pathological fracture in neoplastic disease, left foot

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM80-M85Disorders of bone density and structure
CategoryM84Disorder of continuity of bone
This CodeM84.575SPathological fracture in neoplastic disease, left foot, sequela

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Pathological fracture of left foot
  • Pathological fracture of left foot due to neoplastic disease

Clinical ClassificationClinical

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

CCSR MUS020
Pathological, stress and atypical fractures, sequela
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Foot Injuries and Disorders

Each of your feet has 26 bones, 33 joints, and more than 100 tendons, muscles, and ligaments. No wonder a lot of things can go wrong. Here are a few common problems:

Read the full article at MedlinePlus

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

Convert M84.575S to ICD-9-CMHistory

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

ICD-9-CM
905.4 Late effect leg fx
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 M84.575SOverview

Is M84.575S (Pathological fracture in neoplastic disease, left foot) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report pathological fracture in neoplastic disease, left foot, sequela on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character S in M84.575S mean?

The final character S makes this a sequela code: it reports a lingering problem that remains after the pathological fracture in neoplastic disease, left foot itself has resolved, not the original event.

What MS-DRG does M84.575S group to?

When pathological fracture in neoplastic disease, left foot, sequela is the principal diagnosis on an inpatient stay, it groups to MS-DRG 559, 560, 561, with relative weights from 0.8039 to 1.8649 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of M84.575S?

Under the General Equivalence Mappings, pathological fracture in neoplastic disease, left foot, sequela converts to ICD-9-CM 905.4 (late effect leg fx). 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.