2026 ICD-10-CM Diagnosis Code K00.1Supernumerary teeth

ICD-10-CM Codes›K00–K95›K00-K14›K00

ICD-10-CM K00.1
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K00.1 is a billable ICD-10-CM diagnosis code for supernumerary teeth. 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 teeth and gingiva, and Nontraumatic dental conditions.

Code Identity

ICD-10-CM Code
K00.1
Billable Status
Yes — Valid for Submission
Code Describes
Supernumerary teeth
Short Description
Supernumerary teeth
Same as the full description in the CMS dataset.
Parent Code
K00
Disorders of tooth development and eruption

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK00-K14Diseases of oral cavity and salivary glands
CategoryK00Disorders of tooth development and eruption
This CodeK00.1Supernumerary teeth

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Conical supernumerary tooth
  • Crowding of teeth
  • Crowding of teeth due to supernumerary teeth
  • Developmental abnormality of canine tooth
  • Developmental abnormality of cusp of tooth
  • Developmental abnormality of premolar tooth
  • Distomolar supernumerary tooth
  • Duplication of root of permanent tooth due to and following dental trauma
  • Duplication of teeth
  • Erupted mesiodens
  • Impacted mesiodens
  • Inverted mesiodens
  • Mesiodens
  • Molariform supernumerary tooth
  • Multiple supernumerary teeth related to systemic condition
  • Paramolar supernumerary tooth
  • Radix entomolaris
  • Radix paramolaris
  • Supernumerary cusp of tooth
  • Supernumerary deciduous mandibular left canine tooth
  • Supernumerary deciduous mandibular left central incisor tooth
  • Supernumerary deciduous mandibular left first molar tooth
  • Supernumerary deciduous mandibular left lateral incisor tooth
  • Supernumerary deciduous mandibular left second molar tooth
  • Supernumerary deciduous mandibular right canine tooth
  • Supernumerary deciduous mandibular right central incisor tooth
  • Supernumerary deciduous mandibular right first molar tooth
  • Supernumerary deciduous mandibular right lateral incisor tooth
  • Supernumerary deciduous mandibular right second molar tooth
  • Supernumerary deciduous mandibular tooth
  • Supernumerary deciduous maxillary left canine tooth
  • Supernumerary deciduous maxillary left central incisor tooth
  • Supernumerary deciduous maxillary left first molar tooth
  • Supernumerary deciduous maxillary left lateral incisor tooth
  • Supernumerary deciduous maxillary left second molar tooth
  • Supernumerary deciduous maxillary right canine tooth
  • Supernumerary deciduous maxillary right central incisor tooth
  • Supernumerary deciduous maxillary right first molar tooth
  • Supernumerary deciduous maxillary right lateral incisor tooth
  • Supernumerary deciduous maxillary right second molar tooth
  • Supernumerary deciduous maxillary tooth
  • Supernumerary deciduous tooth
  • Supernumerary peridens tooth
  • Supernumerary permanent mandibular left canine tooth
  • Supernumerary permanent mandibular left central incisor tooth
  • Supernumerary permanent mandibular left first molar tooth
  • Supernumerary permanent mandibular left first premolar tooth
  • Supernumerary permanent mandibular left lateral incisor tooth
  • Supernumerary permanent mandibular left second molar tooth
  • Supernumerary permanent mandibular left second premolar tooth
  • Supernumerary permanent mandibular left third molar tooth
  • Supernumerary permanent mandibular right canine tooth
  • Supernumerary permanent mandibular right central incisor tooth
  • Supernumerary permanent mandibular right first molar tooth
  • Supernumerary permanent mandibular right first premolar tooth
  • Supernumerary permanent mandibular right lateral incisor tooth
  • Supernumerary permanent mandibular right second molar tooth
  • Supernumerary permanent mandibular right second premolar tooth
  • Supernumerary permanent mandibular right third molar tooth
  • Supernumerary permanent mandibular tooth
  • Supernumerary permanent maxillary left canine tooth
  • Supernumerary permanent maxillary left central incisor tooth
  • Supernumerary permanent maxillary left first molar tooth
  • Supernumerary permanent maxillary left first premolar tooth
  • Supernumerary permanent maxillary left lateral incisor tooth
  • Supernumerary permanent maxillary left second molar tooth
  • Supernumerary permanent maxillary left second premolar tooth
  • Supernumerary permanent maxillary left third molar tooth
  • Supernumerary permanent maxillary right canine tooth
  • Supernumerary permanent maxillary right central incisor tooth
  • Supernumerary permanent maxillary right first molar tooth
  • Supernumerary permanent maxillary right first premolar tooth
  • Supernumerary permanent maxillary right lateral incisor tooth
  • Supernumerary permanent maxillary right second molar tooth
  • Supernumerary permanent maxillary right second premolar tooth
  • Supernumerary permanent maxillary right third molar tooth
  • Supernumerary permanent maxillary tooth
  • Supernumerary permanent tooth
  • Supernumerary root of tooth
  • Supernumerary teeth
  • Supernumerary tooth
  • Supplemental tooth
  • Tuberculate supernumerary tooth

Tabular List NotesGuidance

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

Inclusion Terms

  • Distomolar
  • Fourth molar
  • Mesiodens
  • Paramolar
  • Supplementary teeth

Type 2 Excludes

  • supernumerary roots K00.2

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.

    • Accessory(congenital)
      • teeth, tooth
    • Accessory(congenital)
      • tooth, teeth
    • Distomolar(fourth molar)
    • Excess, excessive, excessively
      • number of teeth
    • Fourth
      • molar
    • Mesiodens, mesiodentes
    • Paramolar
    • Supernumerary(congenital)
      • teeth
    • Supplemental teeth

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

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 K00.1 to ICD-9-CMHistory

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

ICD-9-CM
520.1 Supernumerary teeth
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 K00.1Overview

Is K00.1 (Disorders of tooth development and eruption) a billable code?

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

What MS-DRG does K00.1 group to?

When supernumerary teeth 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 K00.1?

Under the General Equivalence Mappings, supernumerary teeth converts to ICD-9-CM 520.1 (supernumerary teeth). 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.