2026 ICD-10-CM Diagnosis Code K08.409Partial loss of teeth, unspecified cause, unspecified class

ICD-10-CM Codes›K00–K95›K00-K14›K08

ICD-10-CM K08.409
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K08.409 is a billable ICD-10-CM diagnosis code for partial loss of teeth, unspecified cause, unspecified class. 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 edentulous mandible. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Any dental condition including traumatic injury; Caries, periodontitis, and other preventable dental conditions; and Disorders of teeth and gingiva.

Code Identity

ICD-10-CM Code
K08.409
Billable Status
Yes — Valid for Submission
Code Describes
Partial loss of teeth, unspecified cause, unspecified class
Short Description
Partial loss of teeth, unspecified cause, unspecified class
Same as the full description in the CMS dataset.
Parent Code
K08.40
Partial loss of teeth, unspecified cause

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK00-K14Diseases of oral cavity and salivary glands
CategoryK08Other disorders of teeth and supporting structures
This CodeK08.409Partial loss of teeth, unspecified cause, unspecified class

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Edentulous mandible
  • Partial edentulism
  • Partially edentulous mandible
  • Partially edentulous maxilla

Tabular List NotesGuidance

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

Inclusion Terms

  • Tooth extraction status 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.

    • Absence(of) (organ or part) (complete or partial)
      • teeth, tooth (congenital)
        • acquired (complete)
          • partial
    • Status(post)
      • tooth (teeth) extraction

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 DEN003
Caries, periodontitis, and other preventable dental conditions
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

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 K08.409 to ICD-9-CMHistory

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

ICD-9-CM
525.50 Partial edentulism NOS
ApproximateCombination The match is approximate, and more than one code can be needed to describe the source diagnosis. Confirm with contextual judgment.
ICD-9-CM
525.10 Acq absence of teeth NOS
ApproximateCombination The match is approximate, and more than one code can be needed to describe the source diagnosis. Confirm with contextual judgment.

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 K08.409Overview

Is K08.409 (Partial loss of teeth, unspecified cause) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report partial loss of teeth, unspecified cause, unspecified class on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does K08.409 group to?

When partial loss of teeth, unspecified cause, unspecified class 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 K08.409?

Under the General Equivalence Mappings, partial loss of teeth, unspecified cause, unspecified class converts to ICD-9-CM 525.50 (partial edentulism NOS) and 525.10 (acq absence of teeth NOS). The mapping is approximate, so confirm the match fits the documentation.

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.