2026 ICD-10-CM Diagnosis Code M27.8Other specified diseases of jaws

ICD-10-CM Codes›M00–M99›M26-M27›M27

ICD-10-CM M27.8
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M27.8 is a billable ICD-10-CM diagnosis code for other specified diseases of jaws. 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. 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
M27.8
Billable Status
Yes — Valid for Submission
Code Describes
Other specified diseases of jaws
Short Description
Other specified diseases of jaws
Same as the full description in the CMS dataset.
Parent Code
M27
Other diseases of jaws

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM26-M27Dentofacial anomalies [including malocclusion] and other disorders of jaw
CategoryM27Other diseases of jaws
This CodeM27.8Other specified diseases of jaws

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Abnormal jaw movement
  • Abnormal jaw opening
  • Buccal exostosis
  • Cherubic facies
  • Cherubism with gingival fibromatosis
  • Condylar hypoplasia with mandibular asymmetry
  • Exostosis of jaw
  • Fibro-osseous lesion of jaw
  • Fibrosis of capsule of temporomandibular joint
  • Fibrous dysplasia of jaw
  • Fistula of hard palate
  • Fistula of soft palate
  • Gingival fibromatosis
  • Hypoplasia of left condyloid process of mandible
  • Hypoplasia of mandibular condyle
  • Hypoplasia of right condyloid process of mandible
  • Labial exostosis
  • Lack of posterior alveolar arch support
  • Lateral soft palate fistula
  • Lingual exostosis
  • Mandibular laterognathia
  • Motor function of jaw - finding
  • Palatal tubercle
  • Resorption of mandible
  • Resorption of mandibular condyle
  • Weak down pressure of chin
  • Weak lateral movement of chin

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Cherubism
  • Exostosis
  • Fibrous dysplasia
  • Unilateral condylar hyperplasia
  • Unilateral condylar hypoplasia

Type 1 Excludes

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Cherubism
    • Deformity
      • palate (congenital)
        • acquired
    • Disease, diseased
      • jaw
        • specified NEC
    • Dysplasia
      • fibrous
        • jaw
    • Enostosis
    • Exostosis
      • jaw (bone)
    • Fistula(cutaneous)
      • palate (hard)
    • Hyperplasia, hyperplastic
      • mandible, mandibular
        • unilateral condylar
    • Hyperplasia, hyperplastic
      • unilateral condylar
    • Hypertrophy, hypertrophic
      • palate (hard)
    • Hypoplasia, hypoplastic
      • mandible, mandibular
        • unilateral condylar
    • Hypoplasia, hypoplastic
      • unilateral condylar

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

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 M27.8 to ICD-9-CMHistory

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

ICD-9-CM
526.81 Exostosis of jaw
Approximate The match is approximate rather than exact.
ICD-9-CM
526.89 Jaw disease NEC
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 M27.8Overview

Is M27.8 (Other diseases of jaws) a billable code?

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

What MS-DRG does M27.8 group to?

When other specified diseases of jaws 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 M27.8?

Under the General Equivalence Mappings, other specified diseases of jaws converts to ICD-9-CM 526.81 (exostosis of jaw) and 526.89 (jaw disease NEC). 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.