ICD-10-CM 2027 diagnosis code
K04Diseases of pulp and periapical tissues
K04 is a header code, so it can't be reported by itself. Choose one of the 10 more specific codes beneath it.
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 K04
K04 is the ICD-10-CM diagnosis code for diseases of pulp and periapical tissues. It belongs to block K00-K14 (diseases of oral cavity and salivary glands) and chapter 11 (diseases of the digestive system). It is a header code, so it can't be reported by itself; one of its 10 subcodes must be used instead.
To report this condition, pick the subcode that matches the documentation: K04.0 (pulpitis), K04.1 (pulp), K04.2 (degeneration), K04.3 (pulp), K04.4 (origin), K04.5 (periodontitis), K04.6 (sinus), K04.7 (sinus) and 2 more.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Specific codes under K04
- K04.0Pulpitis
- K04.1Necrosis of pulpBillable
- K04.2Pulp degenerationBillable
- K04.3Abnormal hard tissue formation in pulpBillable
- K04.4Acute apical periodontitis of pulpal originBillable
- K04.5Chronic apical periodontitisBillable
- K04.6Periapical abscess with sinusBillable
- K04.7Periapical abscess without sinusBillable
- K04.8Radicular cystBillable
- K04.9Other and unspecified diseases of pulp and periapical tissues
Notes that apply from higher levels
Instructions written at a parent level also apply to K04.
Broader instructions also apply from Chapter 11: Diseases of the digestive system.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about K04
Is K04 billable?
- No. K04 is a header code. Report one of its more specific subcodes instead.