K04.8
ICD-10BillableRadicular cyst
Official ICD-10-CM descriptor (FY2026)
Radicular cyst
K04.8 is valid for submission on a claim — CMS flags it as a billable, specific code.
Inclusion terms
- Apical (periodontal) cyst
- Periapical cyst
- Residual radicular cyst
Excludes2
Not included here. The condition is not part of this code, but a patient may have both, and both codes may be reported together.
- lateral periodontal cyst (K09.0)
Related codes in K04
- K04.0Pulpitiscategory
- K04.1Necrosis of pulp
- K04.2Pulp degeneration
- K04.3Abnormal hard tissue formation in pulp
- K04.4Acute apical periodontitis of pulpal origin
- K04.5Chronic apical periodontitis
- K04.6Periapical abscess with sinus
- K04.7Periapical abscess without sinus
- K04.9Other and unsp diseases of pulp and periapical tissuescategory
Where this code sits
- Parent code
- K04
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ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.