2026 ICD-10-CM Diagnosis Code K03.4Hypercementosis

ICD-10-CM Codes›K00–K95›K00-K14›K03

ICD-10-CM K03.4
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K03.4 is a billable ICD-10-CM diagnosis code for hypercementosis. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 11 through 13, 157 through 159. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Any dental condition including traumatic injury, Disorders of teeth and gingiva, and Nontraumatic dental conditions.

Code Identity

ICD-10-CM Code
K03.4
Billable Status
Yes — Valid for Submission
Code Describes
Hypercementosis
Short Description
Hypercementosis
Same as the full description in the CMS dataset.
Parent Code
K03
Other diseases of hard tissues of teeth

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK00-K14Diseases of oral cavity and salivary glands
CategoryK03Other diseases of hard tissues of teeth
This CodeK03.4Hypercementosis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Hypercementosis

Tabular List NotesGuidance

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

Inclusion Terms

  • Cementation hyperplasia

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

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 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

  • Hypercementosis

    a regressive change of teeth characterized by excessive development of secondary cementum on the tooth surface. it may occur on any part of the root, but the apical two-thirds are most commonly affected. (dorland, 27th ed)

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 K03.4 to ICD-9-CMHistory

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

ICD-9-CM
521.5 Hypercementosis
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 K03.4Overview

What is the ICD-10 code for hypercementosis?

The ICD-10-CM code for hypercementosis is K03.4 (sometimes written as K034). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Is K03.4 (Other diseases of hard tissues of teeth) a billable code?

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

What MS-DRG does K03.4 group to?

When hypercementosis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 11, 12, 13, 157, 158, 159, with relative weights from 0.7085 to 5.4541 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of K03.4?

Under the General Equivalence Mappings, hypercementosis converts to ICD-9-CM 521.5 (hypercementosis). The mapping is a direct match.