K05.20 Aggressive periodontitis, unspecified

Billable ICD-10-CM code, FY2026.

Applies from K05 Gingivitis and periodontal diseases

Use additional code

• code to identify:
• alcohol abuse and dependence (F10.-)
• exposure to environmental tobacco smoke (Z77.22)
• exposure to tobacco smoke in the perinatal period (P96.81)
• history of tobacco dependence (Z87.891)
• occupational exposure to environmental tobacco smoke (Z57.31)
• tobacco dependence (F17.-)
• tobacco use (Z72.0)

Applies from K05.2 Aggressive periodontitis

Applicable to

• Acute pericoronitis

Excludes1 (never code together)

• acute apical periodontitis (K04.4)
• periapical abscess (K04.7)
• periapical abscess with sinus (K04.6)

MS-DRG index

Defines the logic of DRG(s) 011-013 in MDC PRE.

Approximate ICD-9-CM (GEMs)

• 523.30 Aggressive periodontitis, unspecified (approximate)
• 523.33 Acute periodontitis (approximate)

Code annotations containing back-references to K05.20

Back-references to K05.2

• Type 1 Excludes: K04.4 Acute apical periodontitis of pulpal origin ("acute periodontitis (K05.2-)")

Back-references to K05

• Type 2 Excludes: K13 Other diseases of lip and oral mucosa ("certain disorders of gingiva and edentulous alveolar ridge (K05-K06)")

Diagnosis Index entries for K05.20

• Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic) › gingival › aggressive
• Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic) › gum › aggressive
• Infection, infected, infective (opportunistic) › peridental, periodontal
• Infection, infected, infective (opportunistic) › tooth, teeth › peridental, periodontal
• Pericementitis (chronic) (suppurative) › acute
• Periodontitis (chronic) (complex) (compound) (local) (simplex) › acute
• Periodontitis (chronic) (complex) (compound) (local) (simplex) › aggressive
• Suppuration, suppurative › gum

Nearby codes

• K05.01 Acute gingivitis, non-plaque induced
• K05.1 Chronic gingivitis
• K05.10 Chronic gingivitis, plaque induced
• K05.11 Chronic gingivitis, non-plaque induced
• K05.2 Aggressive periodontitis
• K05.20 Aggressive periodontitis, unspecified (this code)
• K05.21 Aggressive periodontitis, localized
• K05.211 Aggressive periodontitis, localized, slight
• K05.212 Aggressive periodontitis, localized, moderate
• K05.213 Aggressive periodontitis, localized, severe
• K05.219 Aggressive periodontitis, localized, unspecified severity