K00.4 Disturbances in tooth formation

The ICD-10-CM code for Disturbances in tooth formation is K00.4 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

11: Diseases of the digestive system (K00-K95)

Section

K00-K14: Diseases of oral cavity and salivary glands (K00-K14)

Category K00

11 codes (10 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to K00.4:

• Dilaceration, tooth
• Odontodysplasia, regional
• Ghost › teeth
• Calcification › dentinal papilla
• Hypoplasia, hypoplastic › enamel of teeth (neonatal) (postnatal) (prenatal)
• Aplasia › cementum
• Hypoplasia, hypoplastic › cementum
• Amelogenesis imperfecta › nonhereditaria (segmentalis)

Inclusion Terms

• Aplasia and hypoplasia of cementum
• Dilaceration of tooth
• Enamel hypoplasia (neonatal) (postnatal) (prenatal)
• Regional odontodysplasia
• Turner's tooth

U.S. Hospital Utilization

• An estimated 75 U.S. inpatient stays in 2017 included K00.4 among the documented diagnoses.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

Official Coding Guidelines

Chapter 11 reserved for future expansion

11. Chapter 11: Diseases of the Digestive System (K00-K95) Reserved for future guideline expansion

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool
• AHRQ — HCUP National Inpatient Sample, Frequencies by Diagnosis Code (2016–2023)