2026 ICD-10-CM Diagnosis Code K08.20Unspecified atrophy of edentulous alveolar ridge

ICD-10-CM Codes›K00–K95›K00-K14›K08

ICD-10-CM K08.20
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K08.20 is a billable ICD-10-CM diagnosis code for unspecified atrophy of edentulous alveolar ridge. 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 alveolar bone loss. 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
K08.20
Billable Status
Yes — Valid for Submission
Code Describes
Unspecified atrophy of edentulous alveolar ridge
Short Description
Unspecified atrophy of edentulous alveolar ridge
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 CodeK08.20Unspecified atrophy of edentulous alveolar ridge

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Alveolar bone loss
  • Alveolar ridge abnormality of maxilla
  • Atrophy of edentulous alveolar ridge
  • Atrophy of edentulous mandibular alveolar ridge
  • Atrophy of edentulous maxillary alveolar ridge
  • Edentulous alveolar ridge with labial resorption
  • Horizontal alveolar bone loss
  • Horizontal atrophy of edentulous alveolar ridge

Tabular List NotesGuidance

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

Inclusion Terms

  • Atrophy of the mandible NOS
  • Atrophy of the maxilla NOS

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)
      • alveolar process or ridge (edentulous)
    • Atrophy, atrophic(of)
      • edentulous alveolar ridge
    • Atrophy, atrophic(of)
      • mandible (edentulous)
    • Atrophy, atrophic(of)
      • maxilla

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

Clinical InformationClinical

  • Alveolar Bone Loss

    resorption or wasting of the tooth-supporting bone (alveolar process) in the maxilla or mandible.

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 K08.20 to ICD-9-CMHistory

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

ICD-9-CM
525.20 Atrophy alvlar ridge NOS
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 K08.20Overview

Is K08.20 (Atrophy of edentulous alveolar ridge) a billable code?

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

What MS-DRG does K08.20 group to?

When unspecified atrophy of edentulous alveolar ridge 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 K08.20?

Under the General Equivalence Mappings, unspecified atrophy of edentulous alveolar ridge converts to ICD-9-CM 525.20 (atrophy alvlar ridge NOS). 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.