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ICD-10-CM 2027 diagnosis code

K00.2Abnormalities of size and form of teeth

✓ Billable / specific

K00.2 is a valid, billable ICD-10-CM code for abnormalities of size and form of teeth. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Looking up by condition? See ICD-10 code for Twinning, ICD-10 code for Dichotomy, ICD-10 code for Enameloma, ICD-10 code for Gemination.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About K00.2

K00.2 is the ICD-10-CM diagnosis code for abnormalities of size and form of teeth. It belongs to category K00 (disorders of tooth development and eruption), block K00-K14 (diseases of oral cavity and salivary glands) and chapter 11 (diseases of the digestive system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within K00 (disorders of tooth development and eruption), K00.2 is specifically for abnormalities of size and form of teeth. Related codes cover Anodontia (K00.0), Supernumerary teeth (K00.1), Mottled teeth (K00.3), disturbances in tooth formation (K00.4), hereditary disturbances in tooth structure, not elsewhere classified (K00.5), disturbances in tooth eruption (K00.6), Teething syndrome (K00.7), other disorders of tooth development (K00.8) and 1 more.

Don't report K00.2 together with the conditions in its Excludes1 note: abnormalities of teeth due to congenital syphilis (A50.5) and tuberculum Carabelli, which is regarded as a normal variation and should not be coded.

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 011 (Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy with MCC, relative weight 5.6154), DRG 012 (Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy with CC, relative weight 4.381), DRG 013 (Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy without CC/MCC, relative weight 2.7307), DRG 157 (Dental and Oral Diseases with MCC, relative weight 1.809), DRG 158 (Dental and Oral Diseases with CC, relative weight 0.9366) and DRG 159 (Dental and Oral Diseases without CC/MCC, relative weight 0.6893), in Pre-MDC and MDC 03 (Diseases and Disorders of the Ear, Nose, Mouth and Throat), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 520.2 (abnormalities of size and form of teeth).

Coding notes

Applicable toConditions and synonyms classified to this code
  • Concrescence of teeth
  • Fusion of teeth
  • Gemination of teeth
  • Dens evaginatus
  • Dens in dente
  • Dens invaginatus
  • Enamel pearls
  • Macrodontia
  • Microdontia
  • Peg-shaped [conical] teeth
  • Supernumerary roots
  • Taurodontism
  • Tuberculum paramolare
Excludes1Not coded here — never report together with this code
  • abnormalities of teeth due to congenital syphilis (A50.5)
  • tuberculum Carabelli, which is regarded as a normal variation and should not be coded

Notes that apply from higher levels

Instructions written at a parent level also apply to K00.2.

› From K00 Disorders of tooth development and eruption
Excludes2
  • embedded and impacted teeth (K01.-)

Broader instructions also apply from Chapter 11: Diseases of the digestive system.

Alphabetic index entries

33 entries

Terms in the official ICD-10-CM index that lead to K00.2.

Codes whose notes reference K00.2

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

ICD-9-CM equivalent

Converter →
  • 520.2Abnormalities of size and form of teethexact

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about K00.2

Is K00.2 billable?

Yes. K00.2 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can K00.2 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict K00.2 as a principal diagnosis.

Is K00.2 a CC or MCC?

No. K00.2 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does K00.2 group to?

K00.2 is used in the MS-DRG v44.0 logic for MS-DRG 011 (Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy with MCC), MS-DRG 012 (Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy with CC), MS-DRG 013 (Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy without CC/MCC), MS-DRG 157 (Dental and Oral Diseases with MCC), MS-DRG 158 (Dental and Oral Diseases with CC) and MS-DRG 159 (Dental and Oral Diseases without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for K00.2?

The CMS General Equivalence Mappings map K00.2 to ICD-9-CM 520.2.