ICD-10 K04.8
Billable / SpecificRadicular cyst
About ICD-10-CM K04.8
ICD-10-CM code K04.8 represents Radicular cyst. This is a billable/specific code in the Digestive System chapter (block K04). The 2026 edition of ICD-10-CM K04.8 became effective on October 1, 2025.
Inclusion Terms / Approximate Synonyms
Clinical terms and conditions classified under K04.8. Per CMS ICD-10-CM Tabular 2026.
- Apical (periodontal) cyst
- Periapical cyst
- Residual radicular cyst
Type 2 Excludes
Not included here, the excluded code is not part of K04.8, but a patient may have both conditions at the same time. Both codes may be coded together when applicable.
- lateral periodontal cyst (K09.0)
Medicare LCD Coverage for K04.8
Local Coverage Determinations (LCDs) from CMS MACs that list K04.8 as a covered diagnosis.
Showing top 10 of 28 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing K04.8.
1 Medicare
CPT Codes Commonly Billed with K04.8
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
We don't have CPT pairings indexed for this specific code yet. Use the CPT search above to find common procedures, or check your payer's published medical policy for code-specific guidance.
Convert K04.8 to ICD-9-CM
Per CMS General Equivalence Mappings (GEMs), useful for legacy data review and historical claim analysis.
| ICD-10 | ICD-9 | Mapping Flags |
|---|---|---|
| K04.8 | 5228 | 00000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To K04.8
Other codes in section K00-K14 (Diseases of oral cavity and salivary glands).
ICD-10 K04.8, Billing FAQ
Is ICD-10 code K04.8 billable? +
Yes, K04.8 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
What other names or terms map to K04.8? +
ICD-10 K04.8 includes: Apical (periodontal) cyst; Periapical cyst; Residual radicular cyst.
What codes are Type 2 Excludes for K04.8? +
Type 2 Excludes (may be coded together when both conditions exist): lateral periodontal cyst (K09.0)
What ICD-9 codes does K04.8 map to? +
Per CMS GEMs, K04.8 maps to ICD-9 codes: 5228. Useful for legacy data review and historical claim analysis.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on June 1, 2026.
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