Diseases of pulp and periapical tissues (K04) ICD-10-CM
The K04 code range covers diseases of pulp and periapical tissues with 15 ICD-10-CM diagnosis codes. 12 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Codes in the K04 Range 15 codes · 12 billable
- K04 Diseases of pulp and periapical tissuesNon-billable
- K04.0 PulpitisNon-billable
- K04.01 Reversible pulpitis
- K04.02 Irreversible pulpitis
- K04.1 Necrosis of pulp
- K04.2 Pulp degeneration
- K04.3 Abnormal hard tissue formation in pulp
- K04.4 Acute apical periodontitis of pulpal origin
- K04.5 Chronic apical periodontitis
- K04.6 Periapical abscess with sinus
- K04.7 Periapical abscess without sinus
- K04.8 Radicular cyst
- K04.9 Other and unspecified diseases of pulp and periapical tissuesNon-billable
- K04.90 Unspecified diseases of pulp and periapical tissues
- K04.99 Other diseases of pulp and periapical tissues
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the K04 range.
Abnormal Hard Tissue Formation in Pulp
Development of hard tissue in the inner substance of the tooth where blood vessels, lymphatic, and nerve tissue is normally found.
Periapical Abscess with Sinus
Localized collection of pus in the tissues that enclose the root of a tooth and is associated with the presence of a sinus tract.
Pulp Degeneration
Deterioration of the normal pulp tissue.
Pulpitis
Inflammation of the DENTAL PULP, usually due to bacterial infection in dental caries, tooth fracture, or other conditions causing exposure of the pulp to bacterial invasion. Chemical irritants, thermal factors, hyperemic changes, and other factors may also cause pulpitis.
Radicular Cyst
Slow-growing fluid-filled epithelial sac at the apex of a tooth with a nonvital pulp or defective root canal filling.
Tooth, Nonvital
A tooth from which the dental pulp has been removed or is necrotic. (Boucher, Clinical Dental Terminology, 4th ed)
About the K04 Code Range
These conditions affect the pulp inside a tooth or tissues around its root tip. They include inflammation, pulp damage, abscesses, and cysts.
K04.0 describes pulpitis, or inflamed tooth pulp, and separates reversible from irreversible forms. Other pulp categories identify tissue death, degeneration, and abnormal hard tissue formation.
For tissues near the root tip, the codes distinguish acute apical periodontitis of pulpal origin from chronic apical periodontitis. Abscesses separate by whether a sinus is present: K04.6 has one, while K04.7 does not. The remaining categories include radicular cysts and other or unspecified diseases of the pulp and surrounding tissues.
Questions About This Page
How many billable codes are in the K04 range?
Of the 15 codes in this range, 12 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the K04 range classify?
The range classifies diseases of pulp and periapical tissues. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
