2026 ICD-10-CM Diagnosis Code M24.312Pathological dislocation of left shoulder, not elsewhere classified

ICD-10-CM Codes›M00–M99›M20-M25›M24

ICD-10-CM M24.312
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M24.312 is a billable ICD-10-CM diagnosis code for pathological dislocation of left shoulder, 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 562 through 563. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified joint disorders.

Code Identity

ICD-10-CM Code
M24.312
Billable Status
Yes — Valid for Submission
Code Describes
Pathological dislocation of left shoulder, not elsewhere classified
Short Description
Pathological dislocation of left shoulder, NEC
Parent Code
M24.31
Pathological dislocation of shoulder, not elsewhere classified

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM20-M25Other joint disorders
CategoryM24Other specific joint derangements
This CodeM24.312Pathological dislocation of left shoulder, not elsewhere classified

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

Dislocated Shoulder

Your shoulder joint is made up of three bones: your collarbone, your shoulder blade, and your upper arm bone. The top of your upper arm bone is shaped like a ball. This ball fits into a cuplike socket in your shoulder blade. A shoulder dislocation is an injury that happens when the ball pops out of your socket.

The full article covers:

  • What is a dislocated shoulder?
  • What causes a dislocated shoulder?
  • Who is at risk for a dislocated shoulder?
  • What are the symptoms of a dislocated shoulder?
  • How is a dislocated shoulder diagnosed?
  • What are the treatments for a dislocated shoulder?

Read the full article at MedlinePlus

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

Convert M24.312 to ICD-9-CMHistory

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

ICD-9-CM
718.21 Pathol dislocat-shlder
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 M24.312Overview

Is M24.312 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report pathological dislocation of left shoulder, not elsewhere classified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does M24.312 group to?

When pathological dislocation of left shoulder, not elsewhere classified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 562, 563, with relative weights from 0.8955 to 1.4248 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of M24.312?

Under the General Equivalence Mappings, pathological dislocation of left shoulder, not elsewhere classified converts to ICD-9-CM 718.21 (pathol dislocat-shlder). 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.