2026 ICD-10-CM Diagnosis Code M95.9Acquired deformity of musculoskeletal system, unspecified

ICD-10-CM Codes›M00–M99›M95›M95

ICD-10-CM M95.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M95.9 is a billable ICD-10-CM diagnosis code for acquired deformity of musculoskeletal system, unspecified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 564 through 566. Coders also document this condition as acquired musculoskeletal deformity. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Acquired deformities (excluding foot).

Code Identity

ICD-10-CM Code
M95.9
Billable Status
Yes — Valid for Submission
Code Describes
Acquired deformity of musculoskeletal system, unspecified
Short Description
Acquired deformity of musculoskeletal system, unspecified
Same as the full description in the CMS dataset.
Parent Code
M95
Other acquired deformities of musculoskeletal system and connective tissue

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM95Other disorders of the musculoskeletal system and connective tissue
CategoryM95Other acquired deformities of musculoskeletal system and connective tissue
This CodeM95.9Acquired deformity of musculoskeletal system, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acquired musculoskeletal deformity
  • Acquired skeletal deformity
  • Angulation deformity of bone - finding
  • Bowing deformity of bone
  • Deformation of bone
  • Deformity after injury
  • Deformity due to and following burn
  • Osteopathies, chondropathies and acquired musculoskeletal deformities
  • Protrusion of bone
  • Rotational deformity of bone

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Deformity
      • acquired (unspecified site)
    • Deformity
      • bone (acquired) NOS
    • Deformity
      • musculoskeletal system (acquired)

Clinical ClassificationClinical

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

CCSR MUS023
Acquired deformities (excluding foot)
Default principal diagnosis: inpatient Yes · outpatient Yes

Convert M95.9 to ICD-9-CMHistory

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

ICD-9-CM
738.9 Acq deformity NOS
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 M95.9Overview

Is M95.9 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report acquired deformity of musculoskeletal system, unspecified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does M95.9 group to?

When acquired deformity of musculoskeletal system, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 564, 565, 566, with relative weights from 0.7493 to 1.5436 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of M95.9?

Under the General Equivalence Mappings, acquired deformity of musculoskeletal system, unspecified converts to ICD-9-CM 738.9 (acq deformity NOS). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.