K05.221 Aggressive periodontitis, generalized, slight

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)

• 523.32 Aggressive periodontitis, generalized (approximate)

Code annotations containing back-references to K05.221

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 K05.221

• Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic) › gingival › aggressive › generalized › slight
• Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic) › gum › aggressive › generalized › slight
• Periodontitis (chronic) (complex) (compound) (local) (simplex) › acute › generalized › slight
• Periodontitis (chronic) (complex) (compound) (local) (simplex) › aggressive › generalized › slight

Nearby codes

• 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
• K05.22 Aggressive periodontitis, generalized
• K05.221 Aggressive periodontitis, generalized, slight (this code)
• K05.222 Aggressive periodontitis, generalized, moderate
• K05.223 Aggressive periodontitis, generalized, severe
• K05.229 Aggressive periodontitis, generalized, unspecified severity
• K05.3 Chronic periodontitis
• K05.30 Chronic periodontitis, unspecified