K04.8 Radicular cyst

Billable ICD-10-CM code, FY2026.

Applicable to

• Apical (periodontal) cyst
• Periapical cyst
• Residual radicular cyst

Excludes2 (not included here)

• lateral periodontal cyst (K09.0)

MS-DRG index

Defines the logic of DRG(s) 011-013 in MDC PRE.

Approximate ICD-9-CM (GEMs)

• 522.8 Radicular cyst

Code annotations containing back-references to K04.8

Back-references to K04.8

• Type 2 Excludes: K09 Cysts of oral region, not elsewhere classified ("radicular cyst (K04.8)")

Diagnosis Index entries for K04.8

• 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)

Nearby codes

• K04.3 Abnormal hard tissue formation in pulp
• K04.4 Acute apical periodontitis of pulpal origin
• K04.5 Chronic apical periodontitis
• K04.6 Periapical abscess with sinus
• K04.7 Periapical abscess without sinus
• K04.8 Radicular cyst (this code)
• K04.9 Other and unspecified diseases of pulp and periapical tissues
• K04.90 Unspecified diseases of pulp and periapical tissues
• K04.99 Other diseases of pulp and periapical tissues