Classification System for Periodontal Diseases and Conditions

There is ongoing confusion regarding how to classify periodontal disease diagnoses. Some dental offices still use outdated AAP classifications or case type classifications developed by some dental insurance companies (primarily Delta, particularly WDS).

In 1999, the American Academy of Periodontology significantly revised their guidelines for periodontal disease classifications. You may read AAP "Development of a Classification System for Periodontal Diseases and Conditions"; Annals of Periodontology, Volume 4 Classification article for helpful details.

In this article, the classifications in Figure 1 may be used as a guide in patient work-ups, charting, and dental insurance documentation. Here is an abbreviated version of the periodontal diseases classifications:

Gingival Diseases

Chronic Periodontitis (slight: 1-2 mm CAL; moderate: 3-4 mm CAL; severe: > 5 mm CAL)

Aggressive Periodontitis (slight: 1-2 mm CAL; moderate: 3-4 mm CAL; severe: > 5 mm CAL)

Periodontitis as a Manifestation of Systemic Diseases

Necrotizing Periodontal Diseases

Abscesses of the Periodontium

Periodontitis Associated With Endodontic Lesions

Developmental or Acquired Deformities and Conditions

See the more detailed Periodontal Disease Classification System.

See the WDS Case Types.