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K05.21

K05.21: Aggressive periodontitis, localized

Non-billable headerICD-10-CM

K05.21 is a non-billable header ICD-10-CM code for aggressive periodontitis, localized. It cannot be billed on its own: choose one of the more specific child codes below.

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

  • Periodontal abscess

Excludes1 inherited from the categories above K05.21

A category’s note binds every code beneath it.

Written on K05.2: Aggressive periodontitis

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

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Code history

Unchanged in every release from FY2024 to FY2027.

Code to one of these instead K05.21

4 child codes. Green means billable.

Other codes under K05.2

ICD-10-CMFY2027· effective October 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release: see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.