K04: Diseases of pulp and periapical tissues
Codes under K04 (Diseases of pulp and periapical tissues). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| K04.0 | Pulpitis | — |
| K04.0 | Pulpitis | — |
| K04.01 | Reversible pulpitis | ✓ |
| K04.01 | Reversible pulpitis | ✓ |
| K04.1 | Necrosis of pulp | ✓ |
| K04.1 | Necrosis of pulp | ✓ |
| K04.02 | Irreversible pulpitis | ✓ |
| K04.02 | Irreversible pulpitis | ✓ |
| K04.2 | Pulp degeneration | ✓ |
| K04.2 | Pulp degeneration | ✓ |
| K04.3 | Abnormal hard tissue formation in pulp | ✓ |
| K04.3 | Abnormal hard tissue formation in pulp | ✓ |
| K04.4 | Acute apical periodontitis of pulpal origin | ✓ |
| K04.4 | Acute apical periodontitis of pulpal origin | ✓ |
| K04.5 | Chronic apical periodontitis | ✓ |
| K04.5 | Chronic apical periodontitis | ✓ |
| K04.6 | Periapical abscess with sinus | ✓ |
| K04.6 | Periapical abscess with sinus | ✓ |
| K04.7 | Periapical abscess without sinus | ✓ |
| K04.7 | Periapical abscess without sinus | ✓ |
| K04.8 | Radicular cyst | ✓ |
| K04.8 | Radicular cyst | ✓ |
| K04.9 | Other and unspecified diseases of pulp and periapical tissues | — |
| K04.9 | Other and unspecified diseases of pulp and periapical tissues | — |
| K04.90 | Unspecified diseases of pulp and periapical tissues | ✓ |
| K04.90 | Unspecified diseases of pulp and periapical tissues | ✓ |
| K04.99 | Other diseases of pulp and periapical tissues | ✓ |
| K04.99 | Other diseases of pulp and periapical tissues | ✓ |
Frequently asked questions
What is ICD-10-CM code K04?
K04 is an ICD-10-CM category covering Diseases of pulp and periapical tissues. It contains 28 more specific diagnosis codes, 24 of which are billable.
Is K04 a billable code?
No — K04 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example K04.0 — Pulpitis). 24 of the 28 codes under K04 are billable.
What codes fall under K04?
K04 includes K04.0, K04.0, K04.01, K04.01, K04.1, plus 23 more. See the full list with descriptions and billable status above.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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