K04.8
Radicular cyst
BillableComplete code, valid to report
K04.8 (also written K048) is a billable ICD-10-CM diagnosis code for radicular cyst. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 12 codes in category K04 (Diseases of pulp and periapical tissues). The Alphabetic Index lists it under 9 entries. Its coding notes include 9 Excludes2 entries.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
This code
- lateral periodontal cyst (K09.0)
Also from chapter/block level (8 notes)
Inherited from Chapter 11 Diseases of the digestive system
- 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)
Inclusion terms
Conditions classified to this code.
This code
- Apical (periodontal) cyst
- Periapical cyst
- Residual radicular cyst
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 9 entries
- Cyst (colloid) (mucous) (simple) (retention), apical (tooth) (periodontal)
- Cyst (colloid) (mucous) (simple) (retention), dental (root)
- Cyst (colloid) (mucous) (simple) (retention), mandible, radicular
- Cyst (colloid) (mucous) (simple) (retention), maxilla, radicular
- Cyst (colloid) (mucous) (simple) (retention), periapical
- Cyst (colloid) (mucous) (simple) (retention), periodontal
- Cyst (colloid) (mucous) (simple) (retention), radicular (residual)
- Cyst (colloid) (mucous) (simple) (retention), radiculodental
- Cyst (colloid) (mucous) (simple) (retention), residual (radicular)