ICD-10 K09
Non-Billable HeaderCysts of oral region, not elsewhere classified
About ICD-10-CM K09
ICD-10-CM code K09 represents Cysts of oral region, not elsewhere classified. This is a non-billable header code in the Digestive System chapter (block K09). The 2026 edition of ICD-10-CM K09 became effective on October 1, 2025. Non-billable codes cannot be used as a primary or secondary diagnosis on a claim, use a more specific child code instead.
Type 2 Excludes
Not included here, the excluded code is not part of K09, but a patient may have both conditions at the same time. Both codes may be coded together when applicable.
- cysts of jaw (M27.0-, M27.4-)
- radicular cyst (K04.8)
Includes
- lesions showing histological features both of aneurysmal cyst and of another fibro-osseous lesion
Medicare LCD Coverage for K09
Local Coverage Determinations (LCDs) from CMS MACs that list K09 as a covered diagnosis.
This doesn't mean the code isn't covered, it means no MAC has issued a Local Coverage Determination naming this specific code. Coverage may still apply under National Coverage Determinations or general medical-necessity rules.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing K09.
Our payer policy database covers Aetna, Cigna, Anthem, BCBS, Humana, and Medicare Advantage plans, but K09 doesn't currently appear in any indexed policy. The code may still be covered under standard plan benefits.
CPT Codes Commonly Billed with K09
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.
Codes Adjacent To K09
Other codes in section K00-K14 (Diseases of oral cavity and salivary glands).
ICD-10 K09, Billing FAQ
Is ICD-10 code K09 billable? +
No, K09 is a non-billable header code. Use a more specific child code from block K09 when submitting claims.
What codes are Type 2 Excludes for K09? +
Type 2 Excludes (may be coded together when both conditions exist): cysts of jaw (M27.0-, M27.4-); radicular cyst (K04.8)
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on May 31, 2026.
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