Non-Billable / Non-Specific Code
ICD-10-CM K05.21 is the diagnosis code for Aggressive periodontitis, localized. This code falls under the section "Diseases of oral cavity and salivary glands" within Chapter 11 — Diseases of the digestive system (K00-K95). It is a non-billable/non-specific ICD-10-CM code that should not be used for reimbursement. A more specific sub-code is required for billing. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
Understanding where K05.21 sits in the ICD-10-CM classification helps ensure proper coding:
No, K05.21 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
K05.21 is the ICD-10-CM diagnosis code for "Aggressive periodontitis, localized". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of K05.21 is K05.2 ("Aggressive periodontitis"). K05.21 provides a more specific classification within this category.
K05.21 is located in Section K00-K14 — "Diseases of oral cavity and salivary glands" within Chapter 11 of the ICD-10-CM Tabular List.
K05.21 has 4 sub-code(s) that provide more specific detail: K05.211, K05.212, K05.213, K05.219.
Use K05.21 when the patients documented diagnosis matches "Aggressive periodontitis, localized" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Aggressive periodontitis, localized is K05.21.
No, K05.21 is non-billable. Use a more specific sub-code for primary diagnosis billing.
K05.21 is in Chapter 11 of the ICD-10-CM Tabular List.
Yes, K05.21 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.