ICD-10-CM > K00-K95 > K00-K14 > K04 K04 Diseases of pulp and periapical tissues Non-Billable/Non-Specific Codes K04.0PulpitisK04.01Reversible pulpitisK04.02Irreversible pulpitisK04.1Necrosis of pulpK04.2Pulp degenerationK04.3Abnormal hard tissue formation in pulpK04.4Acute apical periodontitis of pulpal originK04.5Chronic apical periodontitisK04.6Periapical abscess with sinusK04.7Periapical abscess without sinusK04.8Radicular cystK04.9Other and unspecified diseases of pulp and periapical tissuesK04.90Unspecified diseases of pulp and periapical tissuesK04.99Other diseases of pulp and periapical tissues