2026 ICD-10-CM Diagnosis Code M26.611Adhesions and ankylosis of right temporomandibular joint

ICD-10-CM Codes›M00–M99›M26-M27›M26

ICD-10-CM M26.611
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M26.611 is a billable ICD-10-CM diagnosis code for adhesions and ankylosis of right temporomandibular joint. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 157 through 159. Coders also document this condition as adhesions of temporomandibular joint. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Any dental condition including traumatic injury, Disorders of jaw, and Nontraumatic dental conditions.

Code Identity

ICD-10-CM Code
M26.611
Billable Status
Yes — Valid for Submission
Code Describes
Adhesions and ankylosis of right temporomandibular joint
Short Description
Adhesions and ankylosis of right temporomandibular joint
Same as the full description in the CMS dataset.
Parent Code
M26.61
Adhesions and ankylosis of temporomandibular joint

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 CodeM26.611Adhesions and ankylosis of right temporomandibular joint

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Adhesions of temporomandibular joint
  • Ankylosis of right temporomandibular joint
  • Ankylosis of temporomandibular joint
  • Right temporomandibular joint adhesion

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 DEN002
Nontraumatic dental conditions
Default principal diagnosis: inpatient No · outpatient No

Patient EducationClinical

Temporomandibular Disorders

Temporomandibular disorders (TMDs) are a group of more than 30 conditions that affect your temporomandibular joints (TMJs). You have two TMJs; one on each side of your jaw. They connect your lower jaw to your skull.

The full article covers:

  • What are temporomandibular disorders (TMDs)?
  • What causes temporomandibular disorders (TMDs)?
  • Who is more likely to develop a temporomandibular disorder (TMD)?
  • What are the symptoms of temporomandibular disorders (TMDs)?
  • How are temporomandibular disorders (TMDs) diagnosed?
  • What are the treatments for temporomandibular disorders (TMDs)?

Read the full article at MedlinePlus

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

Convert M26.611 to ICD-9-CMHistory

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

ICD-9-CM
524.61 Adhesns/ankylosis - TMJ
Approximate The match is approximate rather than exact.

Code History & ChangesHistory

Replacement M26.611 replaces the following previously assigned code(s):

  • M26.61 - Adhesions and ankylosis of temporomandibular joint
FY 2018AddedAdded to the ICD-10-CM code setEffective October 1, 2017.
FY 2019–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About M26.611Overview

Is M26.611 (Adhesions and ankylosis of temporomandibular joint) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report adhesions and ankylosis of right temporomandibular joint on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does M26.611 group to?

When adhesions and ankylosis of right temporomandibular joint is the principal diagnosis on an inpatient stay, it groups to MS-DRG 157, 158, 159, with relative weights from 0.7085 to 1.7168 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of M26.611?

Under the General Equivalence Mappings, adhesions and ankylosis of right temporomandibular joint converts to ICD-9-CM 524.61 (adhesns/ankylosis - TMJ). 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.