Chronic periodontitis, localized, severe

This code signifies a long-standing, severe inflammatory disease affecting the supporting structures of a limited number of teeth. It involves significant attachment loss, deep periodontal pockets, and often bone destruction, but is confined to specific areas of the dentition.

Apply this code when documentation confirms chronic periodontitis that is localized to a few teeth or quadrants, with severe clinical indicators such as probing depths of 7mm or greater, significant clinical attachment loss (CAL), and radiographic evidence of substantial bone loss. This diagnosis requires a comprehensive periodontal examination.

• Differentiate from generalized periodontitis (K05.312) based on the extent of affected teeth.
• Ensure documentation explicitly states "severe" to support this specificity, rather than moderate or mild.
• Consider co-morbidities like diabetes (E11.65) which can exacerbate periodontal disease and should be coded separately.