2026 ICD-10-CM Diagnosis Code K08.55Allergy to existing dental restorative material

ICD-10-CM Codes›K00–K95›K00-K14›K08

ICD-10-CM K08.55
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K08.55 is a billable ICD-10-CM diagnosis code for allergy to existing dental restorative material. 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 Allergic reactions; Any dental condition including traumatic injury; and Caries, periodontitis, and other preventable dental conditions.

Code Identity

ICD-10-CM Code
K08.55
Billable Status
Yes — Valid for Submission
Code Describes
Allergy to existing dental restorative material
Short Description
Allergy to existing dental restorative material
Same as the full description in the CMS dataset.
Parent Code
K08.5
Unsatisfactory restoration of tooth

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK00-K14Diseases of oral cavity and salivary glands
CategoryK08Other disorders of teeth and supporting structures
This CodeK08.55Allergy to existing dental restorative material

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Allergic contact gingivitis caused by acrylic dental material
  • Allergic contact gingivitis caused by nickel
  • Allergic gingival disease
  • Allergic gingivitis
  • Allergy to existing dental restorative material
  • Hypersensitivity gingivitis
  • Lichenoid allergic contact reaction
  • Lichenoid allergic contact reaction caused by amalgam

Tabular List NotesGuidance

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

Use Additional Code

  • code to identify the specific type of allergy

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.

    • Allergy, allergic(reaction) (to)
      • dental restorative material (existing)
    • Restorative material(dental)
      • allergy to

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR INJ031
Allergic reactions
Default principal diagnosis: inpatient No · outpatient No
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

Allergy

An allergy is a reaction by your immune system to something that does not bother most other people. People who have allergies often are sensitive to more than one thing. Substances that often cause reactions are:

Read the full article at MedlinePlus

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

Convert K08.55 to ICD-9-CMHistory

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

ICD-9-CM
525.66 Allergy dental res mat
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 K08.55Overview

Is K08.55 (Unsatisfactory restoration of tooth) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report allergy to existing dental restorative material on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does K08.55 group to?

When allergy to existing dental restorative material 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 K08.55?

Under the General Equivalence Mappings, allergy to existing dental restorative material converts to ICD-9-CM 525.66 (allergy dental res mat). 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.