2026 ICD-10-CM Diagnosis Code M26.29Other anomalies of dental arch relationship

ICD-10-CM Codes›M00–M99›M26-M27›M26

ICD-10-CM M26.29
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M26.29 is a billable ICD-10-CM diagnosis code for other anomalies of dental arch relationship. 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 Disorders of teeth and gingiva.

Code Identity

ICD-10-CM Code
M26.29
Billable Status
Yes — Valid for Submission
Code Describes
Other anomalies of dental arch relationship
Short Description
Other anomalies of dental arch relationship
Same as the full description in the CMS dataset.
Parent Code
M26.2
Anomalies of dental arch relationship

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 CodeM26.29Other anomalies of dental arch relationship

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Absence of teeth
  • Asymmetric mandibular arch form
  • Bilateral crossbite
  • Bilateral posterior lingual occlusion of mandibular teeth
  • Bimaxillary proclination
  • Bimaxillary protrusion
  • Broad mandibular arch form
  • Broad maxillary arch form
  • Canine guided functional occlusion
  • Class I incisal relationship
  • Class II buccal segment relationship - half unit
  • Deep curve of Spee
  • Deep impinging overbite with soft tissue destruction
  • Deep overbite
  • Dental arch length loss
  • Dental arch length loss due to congenitally missing teeth
  • Dental arch length loss due to dental caries
  • Dental arch length loss due to loss of deciduous teeth
  • Dental arch length loss due to loss of permanent teeth
  • Dental midlines coincident and incorrect
  • Disto-occlusion of teeth
  • Edentulous
  • Edentulous interarch space limited
  • Edentulous maxillomandibular relationship class I
  • Edentulous maxillomandibular relationship class II
  • Edge to edge occlusion of teeth
  • Excessive curve of Wilson
  • Excessive dental arch length
  • Fit of maxillofacial prosthesis finding
  • Flat curve of Spee
  • Flat curve of Wilson
  • Flush terminal plane occlusion of primary dentition
  • Functional occlusion
  • Group functional occlusion
  • Horizontal overbite
  • Impinging overbite
  • Incisal relationship
  • Incisor tooth inclination - finding
  • Lateral openbite
  • Lateral openbite - left
  • Lateral openbite - right
  • Mandibular midline deviation to left
  • Mandibular midline deviation to right
  • Maxillary and mandibular midline deviation to left
  • Maxillary and mandibular midline deviation to right
  • Maxillary midline deviation to left
  • Maxillary midline deviation to right
  • Midline deviation of dental arch
  • Midline deviation of maxillary dental arch
  • Mild midline deviation of maxillary dental arch to left
  • Mild midline deviation of maxillary dental arch to right
  • Moderate midline deviation of maxillary dental arch to left
  • Moderate midline deviation of maxillary dental arch to right
  • Narrow mandibular arch form
  • Narrow maxillary arch form
  • Non-working interference functional occlusion
  • Open bite
  • Overbite traumatic to labial mucosa
  • Overbite traumatic to palate
  • Periodontitis due to occlusal trauma
  • Posterior crossbite
  • Posterior lingual occlusion of mandibular teeth
  • Proclined incisor tooth
  • Protrusion of tooth
  • Reduced overbite
  • Removable partial denture with loss of occlusal relationship
  • Reverse curve of Spee
  • Reverse curve of Wilson
  • Severe midline deviation of maxillary dental arch to left
  • Severe midline deviation of maxillary dental arch to right
  • Shallow curve of Spee
  • Tooth absent
  • Tooth size - dental arch length discrepancy
  • Traumatic overbite
  • Vertical overbite
  • Working interference functional occlusion

Tabular List NotesGuidance

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

Inclusion Terms

  • Midline deviation of dental arch
  • Overbite (excessive) deep
  • Overbite (excessive) horizontal
  • Overbite (excessive) vertical
  • Posterior lingual occlusion of mandibular teeth

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.

    • Abocclusion
    • Anomaly, anomalous(congenital) (unspecified type)
      • dental
        • arch relationship
          • specified NEC
    • Anomaly, anomalous(congenital) (unspecified type)
      • dentofacial
        • dental arch relationship
          • specified NEC
    • Anomaly, anomalous(congenital) (unspecified type)
      • dentofacial
        • malocclusion
          • dental arch relationship NEC
    • Apertognathia
    • Closed bite
    • Deviation(in)
      • midline (jaw) (teeth) (dental arch)
    • Deviation(in)
      • teeth, midline
    • Occlusion, occluded
      • posterior lingual, of mandibular teeth
    • Occlusion, occluded
      • teeth (mandibular) (posterior lingual)
    • Overbite(deep) (excessive) (horizontal) (vertical)

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

Clinical InformationClinical

  • Open Bite

    a condition in which certain opposing teeth fail to establish occlusal contact when the jaws are closed.

  • Carcinoma in Situ of Gingiva and Edentulous Alveolar Ridge|Carcinoma in situ of gingiva and edentulous alveolar ridge

    evidence of carcinoma in situ of the gingiva and edentulous alveolar ridge.

  • Edentulous

    having teeth in neither the mandible nor the maxilla.

  • Edentulous

    an indication that an individual lacks teeth/dentition.

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 M26.29 to ICD-9-CMHistory

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

ICD-9-CM
524.29 Anomaly dental arch NEC
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 M26.29Overview

Is M26.29 (Anomalies of dental arch relationship) a billable code?

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

What MS-DRG does M26.29 group to?

When other anomalies of dental arch relationship 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 M26.29?

Under the General Equivalence Mappings, other anomalies of dental arch relationship converts to ICD-9-CM 524.29 (anomaly dental arch NEC). The mapping is a direct match.

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.