ICD-10 Code K04.02 – Irreversible Pulpitis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K04.02 – Irreversible pulpitis
What it is
K04.02 identifies irreversible inflammation of the dental pulp that cannot recover on its own. You use it when the tooth nerve is permanently damaged and endodontic treatment or extraction is typically needed.
Clinical signs
Common findings include spontaneous tooth pain, lingering sensitivity to heat or cold, and pain that may wake the patient. Clinical features vary; refer to documentation.
When to use this code
Use this code when the record clearly states irreversible pulpitis, or when the dentist documents pulp inflammation that is not expected to resolve. It fits encounters focused on diagnosis of the affected tooth, including pain evaluation and referral for definitive dental care. Check documentation if the note only says dental pain or pulpitis without specifying irreversibility.
Do not use for
Do not assign K04.02 for reversible pulpitis, nonspecific toothache, or other dental pain without documented irreversible pulp involvement. If the diagnosis is uncertain, check documentation.
Coding tip
Code K04.02 only when the clinician documents “irreversible” pulpitis or equivalent wording.