2026 ICD-10-CM Diagnosis Code M26.51Abnormal jaw closure

ICD-10-CM Codes›M00–M99›M26-M27›M26

ICD-10-CM M26.51
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M26.51 is a billable ICD-10-CM diagnosis code for abnormal jaw closure. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 11 through 13, 157 through 159. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Any dental condition including traumatic injury, Disorders of jaw, and Disorders of teeth and gingiva.

Code Identity

ICD-10-CM Code
M26.51
Billable Status
Yes — Valid for Submission
Code Describes
Abnormal jaw closure
Short Description
Abnormal jaw closure
Same as the full description in the CMS dataset.
Parent Code
M26.5
Dentofacial functional abnormalities

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM26-M27Dentofacial anomalies [including malocclusion] and other disorders of jaw
CategoryM26Dentofacial anomalies [including malocclusion]
This CodeM26.51Abnormal jaw closure

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Abnormal jaw closure
  • Abnormal jaw movement

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.

CCSR DEN001
Any dental condition including traumatic injury
Default principal diagnosis: inpatient No · outpatient No
CCSR MUS029
Disorders of jaw
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR DIG002
Disorders of teeth and gingiva
Default principal diagnosis: inpatient No · outpatient No
CCSR DEN002
Nontraumatic dental conditions
Default principal diagnosis: inpatient No · outpatient No

Patient EducationClinical

Jaw Injuries and Disorders

Your jaw is a set of bones that holds your teeth. It includes:

Read the full article at MedlinePlus

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

Convert M26.51 to ICD-9-CMHistory

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

ICD-9-CM
524.51 Abnormal jaw closure
Exact Match The mapping is direct, with no qualifiers.

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 M26.51Overview

What is the ICD-10 code for abnormal jaw closure?

The ICD-10-CM code for abnormal jaw closure is M26.51 (sometimes written as M2651). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Is M26.51 (Dentofacial functional abnormalities) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report abnormal jaw closure on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does M26.51 group to?

When abnormal jaw closure is the principal diagnosis on an inpatient stay, it groups to MS-DRG 11, 12, 13, 157, 158, 159, with relative weights from 0.7085 to 5.4541 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of M26.51?

Under the General Equivalence Mappings, abnormal jaw closure converts to ICD-9-CM 524.51 (abnormal jaw closure). The mapping is a direct match.