K05.321 Chronic 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 K05.3 Chronic periodontitis

Applicable to

• Chronic pericoronitis
• Complex periodontitis
• Periodontitis NOS
• Simplex periodontitis

Excludes1 (never code together)

• chronic apical periodontitis (K04.5)

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 523.42 Chronic periodontitis, generalized (approximate)

Code annotations containing back-references to K05.321

Back-references to K05.3

• Type 1 Excludes: K04.5 Chronic apical periodontitis ("chronic periodontitis (K05.3-)")

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 K05.321

• Periodontitis (chronic) (complex) (compound) (local) (simplex) › generalized › slight

Nearby codes

• K05.311 Chronic periodontitis, localized, slight
• K05.312 Chronic periodontitis, localized, moderate
• K05.313 Chronic periodontitis, localized, severe
• K05.319 Chronic periodontitis, localized, unspecified severity
• K05.32 Chronic periodontitis, generalized
• K05.321 Chronic periodontitis, generalized, slight (this code)
• K05.322 Chronic periodontitis, generalized, moderate
• K05.323 Chronic periodontitis, generalized, severe
• K05.329 Chronic periodontitis, generalized, unspecified severity
• K05.4 Periodontosis
• K05.5 Other periodontal diseases