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Table 3 CPI Codes in periodontal assessments

From: Prevention in practice – a summary.

CPI code 0

No increased probing depths, no bleeding on probing. Indicates healthy periodontal tissues.

CPI code 1

Bleeding on probing, together with clinical evidence of gingival inflammation (erythema, oedema), indicates gingivitis.

CPI codes 3 and 4

Probing depths of 4mm or greater, indicative of periodontitis. In this case, detailed periodontal examination should be performed, together with radiographic assessment of alveolar bone status as indicated by the clinical situation.