2021 ICD-10-CM Diagnosis Code K05.21

Aggressive periodontitis, localized

    2016 2017 - Converted to Parent Code 2018 2019 2020 2021 Non-Billable/Non-Specific Code
  • K05.21 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
  • The 2021 edition of ICD-10-CM K05.21 became effective on October 1, 2020.
  • This is the American ICD-10-CM version of K05.21 - other international versions of ICD-10 K05.21 may differ.
Applicable To
  • Periodontal abscess
The following code(s) above K05.21 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to K05.21:
  • K00-K95
    2021 ICD-10-CM Range K00-K95

    Diseases of the digestive system

    Type 2 Excludes
    • certain conditions originating in the perinatal period (P04-P96)
    • certain infectious and parasitic diseases (A00-B99)
    • complications of pregnancy, childbirth and the puerperium (O00-O9A)
    • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
    • endocrine, nutritional and metabolic diseases (E00-E88)
    • injury, poisoning and certain other consequences of external causes (S00-T88)
    • neoplasms (C00-D49)
    • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
    Diseases of the digestive system
  • K05
    ICD-10-CM Diagnosis Code K05

    Gingivitis and periodontal diseases

      2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
    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)
    Gingivitis and periodontal diseases
  • K05.2
    ICD-10-CM Diagnosis Code K05.2

    Aggressive periodontitis

      2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
    Applicable To
    • Acute pericoronitis
    Type 1 Excludes
    • acute apical periodontitis (K04.4)
    • periapical abscess (K04.7)
    • periapical abscess with sinus (K04.6)
    Aggressive periodontitis
Approximate Synonyms
  • Aggressive localized periodontitis
Clinical Information
  • Localized circumscribed purulent area of inflammation in the periodontal tissue. It is a derivative of marginal periodontitis and commonly associated with suprabony and infrabony pockets and interradicular involvements, in contrast to periapical abscess which is attributable to pulp necrosis.
Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): Deleted code
  • 2017 (effective 10/1/2016): New code
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
  • 2021 (effective 10/1/2020): No change
Code annotations containing back-references to K05.21:
  • Type 2 Excludes: K12.2
    ICD-10-CM Diagnosis Code K12.2

    Cellulitis and abscess of mouth

      2016 2017 2018 2019 2020 2021 Billable/Specific Code
    Applicable To
    • Cellulitis of mouth (floor)
    • Submandibular abscess
    Type 2 Excludes
ICD-10-CM Codes Adjacent To K05.21
K04.99 Other diseases of pulp and periapical tissues
K05 Gingivitis and periodontal diseases
K05.0 Acute gingivitis
K05.00 …… plaque induced
K05.01 …… non-plaque induced
K05.1 Chronic gingivitis
K05.10 …… plaque induced
K05.11 …… non-plaque induced
K05.2 Aggressive periodontitis
K05.20 …… unspecified
K05.21 Aggressive periodontitis, localized
K05.211 …… slight
K05.212 …… moderate
K05.213 …… severe
K05.219 …… unspecified severity
K05.22 Aggressive periodontitis, generalized
K05.221 …… slight
K05.222 …… moderate
K05.223 …… severe
K05.229 …… unspecified severity
K05.3 Chronic periodontitis

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.