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ICD-10/K05.21

K05.21 ICD-10-CM Code: Aggressive periodontitis, localized

Billing Status: NO. This is a clinician non-billable / parent hierarchy grouping in the ICD-10-CM system.

Official Registry Overview & Definition

Aggressive periodontitis, localized is a non-billable ICD-10-CM category code (K05.21). A more specific billable subcode must be selected for claims submission.

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for K05.21 in the official ICD-10-CM tabular list.

Inclusion Terms

Alternative terms the tabular list files under this code.

  • Periodontal abscess

Excludes1 — Not Coded Here

Conditions generally not reported together with this code (Excludes1) -- an error unless the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Use Additional Code

Supplementary codes the tabular list directs you to add.

  • Use additional 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)

Change history

Verify Before Coding

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim.

Contextual Map

Every relationship of K05.21 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Hierarchy

  • K00-K95 — Chapter 11: Diseases of the Digestive System (K00-K95) (K00-K95) [Hierarchy]

Referenced by Excludes1 notes

  • K04.4 — Acute apical periodontitis of pulpal origin [Excludes1](via K05.2.-): “acute periodontitis (K05.2-)” · check together

Referenced by Excludes2 notes

  • K12.2 — Cellulitis and abscess of mouth [Excludes2]: “periodontal abscess (K05.21)” · check together
  • K13 — Other diseases of lip and oral mucosa [Excludes2](via K05.-): “certain disorders of gingiva and edentulous alveolar ridge (K05-K06)” · check together

Clinical classification (CCSR)

  • DIG002 — Disorders of teeth and gingiva [CCSR]
  • DEN001 — Any dental condition including traumatic injury [CCSR]
  • DEN002 — Nontraumatic dental conditions [CCSR]
  • DEN003 — Caries, periodontitis, and other preventable dental conditions [CCSR]

Nearest codes (33)

  • K05 — Gingivitis and periodontal diseases [Sibling]
  • K05.0 — Acute gingivitis [Sibling]
  • K05.00 — Acute gingivitis, plaque induced [Sibling]
  • K05.01 — Acute gingivitis, non-plaque induced [Sibling]
  • K05.1 — Chronic gingivitis [Sibling]
  • K05.10 — Chronic gingivitis, plaque induced [Sibling]
  • K05.11 — Chronic gingivitis, non-plaque induced [Sibling]
  • K05.2 — Aggressive periodontitis [Sibling]
  • and 25 more

Change history

  • FY2017 — Became a non-billable header [Change history]

Referenced by Other Codes

Clinical classification (AHRQ CCSR):DIG002 — Disorders of teeth and gingiva (default); DEN001 — Any dental condition including traumatic injury; DEN002 — Nontraumatic dental conditions; DEN003 — Caries, periodontitis, and other preventable dental conditions.

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Official ICD-10-CM tabular notes on other codes that name K05.21 or its code family.

1 Excludes1 notes: K04.4 (via K05.2.-).

2 Excludes2 notes: K12.2, K13 (via K05.-).

Frequently Asked Questions (FAQ) & Clinical Guidance

Can K05.21 be billed directly?

No. K05.21 (Aggressive periodontitis, localized) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to K05.21 in its code family, with their registry titles.

  • 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
  • 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

View all codes in the K05 family