ICD-10-CM > K00-K95 > K00-K14 > K05 > K05.3 > K05.31 K05.31 Chronic periodontitis, localized Non-Billable/Non-Specific Codes K05.311Chronic periodontitis, localized, slightK05.312Chronic periodontitis, localized, moderateK05.313Chronic periodontitis, localized, severeK05.319Chronic periodontitis, localized, unspecified severity