2027 ICD-10-CM Diagnosis Code M95.9Acquired deformity of musculoskeletal system, unspecified
ICD-10-CM Codes›M00–M99›M95›M95
- Billable — Valid for Submission
- Not Chronic
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 2027 (October 1, 2026 through September 30, 2027) 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
Code Classification
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
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to M95.9: its own notes plus those printed at M95 and Chapter 13. A note printed at a category, block or chapter applies to every code under it.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- acquired absence of limbs and organs (Z89-Z90)
- acquired deformities of limbs (M20-M21)
- congenital malformations and deformations of the musculoskeletal system (Q65-Q79)
- deforming dorsopathies (M40-M43)
- dentofacial anomalies [including malocclusion] (M26.-)
- postprocedural musculoskeletal disorders (M96.-)
- arthropathic psoriasis (L40.5-)
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- compartment syndrome (traumatic) (T79.A-)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Notes
General instructions on how these codes are used.
- Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Convert M95.9 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About M95.9Overview
What is the ICD-10 code for acquired deformity of musculoskeletal system, unspecified?
The ICD-10-CM code for acquired deformity of musculoskeletal system, unspecified is M95.9 (sometimes written as M959). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
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, 2026 through September 30, 2027.
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, 566, 565, with relative weights from 0.7374 to 1.4909 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.
