2026 ICD-10-CM Diagnosis Code M25.859Other specified joint disorders, unspecified hip

ICD-10-CM Codes›M00–M99›M20-M25›M25

ICD-10-CM M25.859
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M25.859 is a billable ICD-10-CM diagnosis code for other specified joint disorders, unspecified hip. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 555 through 556. Coders also document this condition as disorder of hip. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified joint disorders.

Code Identity

ICD-10-CM Code
M25.859
Billable Status
Yes — Valid for Submission
Code Describes
Other specified joint disorders, unspecified hip
Short Description
Other specified joint disorders, unspecified hip
Same as the full description in the CMS dataset.
Parent Code
M25.85
Other specified joint disorders, hip

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM20-M25Other joint disorders
CategoryM25Other joint disorder, not elsewhere classified
This CodeM25.859Other specified joint disorders, unspecified hip

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Disorder of hip
  • Femoral acetabular impingement
  • Femoral trochlear dysplasia
  • Mass of hip joint
  • Problem of hip
  • Problem of lower limb
  • Retraction of capsule of hip

Clinical ClassificationClinical

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

CCSR MUS007
Other specified joint disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Hip Injuries and Disorders

Your hip is the joint where your femur (thigh bone) meets your pelvis (hip bone). There are two main parts: a ball at the end of the femur, which fits in a socket in the pelvis. Your hip is known as a ball-and-socket joint. This is because you have a ball at the end of your femur, and it fits into a socket in your pelvis.

Read the full article at MedlinePlus

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

Convert M25.859 to ICD-9-CMHistory

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

ICD-9-CM
719.85 Joint dis NEC-pelvis
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 M25.859Overview

Is M25.859 (Other specified joint disorders, hip) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other specified joint disorders, unspecified hip on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does M25.859 group to?

When other specified joint disorders, unspecified hip is the principal diagnosis on an inpatient stay, it groups to MS-DRG 555, 556, with relative weights from 0.8306 to 1.3218 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of M25.859?

Under the General Equivalence Mappings, other specified joint disorders, unspecified hip converts to ICD-9-CM 719.85 (joint dis NEC-pelvis). 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.