2026 ICD-10-CM Diagnosis Code M26.74Alveolar mandibular hypoplasia

ICD-10-CM Codes›M00–M99›M26-M27›M26

ICD-10-CM M26.74
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M26.74 is a billable ICD-10-CM diagnosis code for alveolar mandibular hypoplasia. 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 congenital alveolar hypoplasia of mandible. 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
M26.74
Billable Status
Yes — Valid for Submission
Code Describes
Alveolar mandibular hypoplasia
Short Description
Alveolar mandibular hypoplasia
Same as the full description in the CMS dataset.
Parent Code
M26.7
Dental alveolar anomalies

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 CodeM26.74Alveolar mandibular hypoplasia

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Congenital alveolar hypoplasia of mandible
  • Mandibular alveolar hypoplasia

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.

    • Anomaly, anomalous(congenital) (unspecified type)
      • alveolar
        • hypoplasia
          • mandibular
    • Hypoplasia, hypoplastic
      • jaw
        • lower
          • alveolar
    • Hypoplasia, hypoplastic
      • mandible, mandibular
        • alveolar

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

Tooth Disorders

Your teeth are made of a hard, bonelike material. There are four parts:

The full article covers:

  • What are teeth?
  • What are tooth disorders?
  • What causes tooth disorders?
  • What are the symptoms of tooth disorders?
  • How are tooth disorders diagnosed?
  • What are the treatments for tooth disorders?
  • Can tooth disorders be prevented?

Read the full article at MedlinePlus

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

Convert M26.74 to ICD-9-CMHistory

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

ICD-9-CM
524.74 Alveolar mandb hypoplsia
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 M26.74Overview

Is M26.74 (Dental alveolar anomalies) a billable code?

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

What MS-DRG does M26.74 group to?

When alveolar mandibular hypoplasia 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 M26.74?

Under the General Equivalence Mappings, alveolar mandibular hypoplasia converts to ICD-9-CM 524.74 (alveolar mandb hypoplsia). The mapping is a direct match.

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.