2026 ICD-10-CM Diagnosis Code K08.23Severe atrophy of the mandible

ICD-10-CM Codes›K00–K95›K00-K14›K08

ICD-10-CM K08.23
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K08.23 is a billable ICD-10-CM diagnosis code for severe atrophy of the mandible. 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
K08.23
Billable Status
Yes — Valid for Submission
Code Describes
Severe atrophy of the mandible
Short Description
Severe atrophy of the mandible
Same as the full description in the CMS dataset.
Parent Code
K08.2
Atrophy of edentulous alveolar ridge

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK00-K14Diseases of oral cavity and salivary glands
CategoryK08Other disorders of teeth and supporting structures
This CodeK08.23Severe atrophy of the mandible

Tabular List NotesGuidance

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

Inclusion Terms

  • Severe atrophy of the edentulous mandible

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.

    • Atrophy, atrophic(of)
      • mandible (edentulous)
        • severe

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 No · outpatient No
CCSR DIG002
Disorders of teeth and gingiva
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 K08.23 to ICD-9-CMHistory

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

ICD-9-CM
525.23 Atrophy mandible-severe
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 K08.23Overview

Is K08.23 (Atrophy of edentulous alveolar ridge) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report severe atrophy of the mandible on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does K08.23 group to?

When severe atrophy of the mandible 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 K08.23?

Under the General Equivalence Mappings, severe atrophy of the mandible converts to ICD-9-CM 525.23 (atrophy mandible-severe). 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.