ICD-10-CM
ICD-10 code for Cyst (colloid) (mucous) (simple) (retention) periapical: K04.8
The ICD-10-CM index points "Cyst (colloid) (mucous) (simple) (retention) periapical" to K04.8, Radicular cyst. K04.8 is a billable code.
Source: CDC ICD-10-CM FY2027 Alphabetic Index file dated June 16, 2026. Publisher page
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More specific codes in K04
A header groups codes and is not billed. A billable code is one you can report.
- K04Diseases of pulp and periapical tissuesHeader
- K04.0PulpitisHeader
- K04.01Reversible pulpitisBillable
- K04.02Irreversible pulpitisBillable
- K04.1Necrosis of pulpBillable
- K04.2Pulp degenerationBillable
- K04.3Abnormal hard tissue formation in pulpBillable
- K04.4Acute apical periodontitis of pulpal originBillable
- K04.5Chronic apical periodontitisBillable
- K04.6Periapical abscess with sinusBillable
- K04.7Periapical abscess without sinusBillable
- K04.8Radicular cystBillable
- K04.9Other and unspecified diseases of pulp and periapical tissuesHeader
- K04.90Unspecified diseases of pulp and periapical tissuesBillable
- K04.99Other diseases of pulp and periapical tissuesBillable
Excludes2
Excludes2 means the other condition can be reported with this one when both are documented.
Related conditions
Related pages
- K04.8 code detailsNotes, nearby codes, CMS-HCC group
- Category K04Every code under it
- Chapter 11Diseases of the digestive system
- ICD-10 codes by conditionA to Z
- Check a list of ICD-10 codes
- Denial code CO-11Diagnosis does not support the procedure
- Denial code CO-146Diagnosis invalid for the date of service
- HCPCS Level II code lookup
Questions
What is the ICD-10 code for Cyst (colloid) (mucous) (simple) (retention) periapical?
The ICD-10-CM index points "Cyst (colloid) (mucous) (simple) (retention) periapical" to K04.8, Radicular cyst. K04.8 is a billable code.
Is K04.8 billable?
Yes. K04.8 is a billable code in the FY2027 ICD-10-CM file. Use a more specific code when the record documents one.
What documentation notes apply to K04.8?
The CDC tabular list gives 1 Excludes2 note (may be coded together when both are documented) for K04.8 and the categories above it. They are listed on this page.
What chapter is K04.8 in?
Chapter 11. Diseases of the digestive system.
When do ICD-10-CM codes change?
Every October 1, with the new fiscal year file. Some years add April 1 updates. This page uses the FY2027 file, effective October 1, 2026.