K04.3 Abnormal hard tissue formation in pulp

The ICD-10-CM code for Abnormal hard tissue formation in pulp is K04.3 (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 K04

15 codes (12 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to K04.3:

• Dentin › irregular (in pulp)
• Anomaly, anomalous (congenital) (unspecified type) › hard tissue formation in pulp
• Irregular, irregularity › dentin (in pulp)
• Dentin › secondary (in pulp)
• Secondary › dentin (in pulp)
• Abnormal, abnormality, abnormalities › hard tissue formation in pulp (dental)

Inclusion Terms

• Secondary or irregular dentine

U.S. Hospital Utilization

K04.3 appeared in too few sampled U.S. inpatient stays in 2022 to report a national estimate (AHRQ suppresses counts of 10 or fewer) — a rare inpatient diagnosis.

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)