ICD-10-CM > K00-K95 > K00-K14 > K05 > K05.2 > K05.21 K05.21 Aggressive periodontitis, localized Non-Billable/Non-Specific Applicable To Periodontal abscess Codes K05.211Aggressive periodontitis, localized, slightK05.212Aggressive periodontitis, localized, moderateK05.213Aggressive periodontitis, localized, severeK05.219Aggressive periodontitis, localized, unspecified severity