2026 ICD-10-CM Diagnosis Code M24.871Other specific joint derangements of right ankle, not elsewhere classified

ICD-10-CM Codes›M00–M99›M20-M25›M24

ICD-10-CM M24.871
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M24.871 is a billable ICD-10-CM diagnosis code for other specific joint derangements of right ankle, not elsewhere classified. 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified joint disorders.

Code Identity

ICD-10-CM Code
M24.871
Billable Status
Yes — Valid for Submission
Code Describes
Other specific joint derangements of right ankle, not elsewhere classified
Short Description
Oth specific joint derangements of right ankle, NEC
Parent Code
M24.87
Other specific joint derangements of ankle and foot, not elsewhere classified

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM20-M25Other joint disorders
CategoryM24Other specific joint derangements
This CodeM24.871Other specific joint derangements of right ankle, not elsewhere classified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Ankle crepitus
  • Crepitus of joint of bilateral ankles
  • Crepitus of joint of left ankle
  • Crepitus of joint of right ankle
  • Derangement of ankle
  • Derangement of bilateral ankle joints
  • Derangement of left ankle joint
  • Derangement of right ankle joint

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

Ankle Injuries and Disorders

Your ankle bone and the ends of your two lower leg bones make up the ankle joint. Your ligaments, which connect bones to one another, stabilize and support it. Your muscles and tendons move it.

Read the full article at MedlinePlus

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

Convert M24.871 to ICD-9-CMHistory

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

ICD-9-CM
718.77 Dev disloc jt-ankle/foot
Approximate The match is approximate rather than exact.
ICD-9-CM
718.87 Jt derangement NEC-ankle
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 M24.871Overview

Is M24.871 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other specific joint derangements of right ankle, not elsewhere classified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does M24.871 group to?

When other specific joint derangements of right ankle, not elsewhere classified 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 M24.871?

Under the General Equivalence Mappings, other specific joint derangements of right ankle, not elsewhere classified converts to ICD-9-CM 718.77 (dev disloc jt-ankle/foot) and 718.87 (jt derangement NEC-ankle). 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.