K04.8 — Radicular cyst
K04.8 is a billable, specific ICD-10-CM code for radicular cyst. It is valid for submission on a claim.
Excludes2 — not included here, but may coexist
The excluded condition is not part of this code, but a patient can have both. You may code both.
- lateral periodontal cyst (K09.0)
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Apical (periodontal) cyst
- Periapical cyst
- Residual radicular cyst
Risk adjustment
K04.8 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Medicare coverage
K04.8 is named in 1 Medicare coverage policy — 1 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A57204Billing and Coding: MRI and CT Scans of the Head and Neck
How K04.8 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to K04.8.
- Cyst›apical(tooth) (periodontal)
- Cyst›dental(root)
- Cyst›periapical
- Cyst›periodontal
- Cyst›radicular(residual)
- Cyst›radiculodental
- Cyst›residual(radicular)
- Cyst›mandible›radicular
- Cyst›maxilla›radicular
Related codes at this level
Codes that share K04. If K04.8 is not quite right, the correct code is usually one of these.
- K04.0Pulpitis
- K04.1Necrosis of pulp
- K04.2Pulp degeneration
- K04.3Abnormal hard tissue formation in pulp
- K04.4Acute apical periodontitis of pulpal origin
- K04.5Chronic apical periodontitis
- K04.6Periapical abscess with sinus
- K04.7Periapical abscess without sinus
- K04.9Other and unspecified diseases of pulp and periapical tissues
Questions about K04.8
- Is K04.8 a billable ICD-10-CM code?
- Yes. K04.8 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does K04.8 sit in the tabular list?
- Diseases of the digestive system (K00-K95), in the block Diseases of oral cavity and salivary glands (K00-K14).