K04.8
Radicular cyst
Clinical Classification Guidelines
Inclusion Terms
- Apical (periodontal) cyst
- Periapical cyst
- Residual radicular cyst
Excludes Type 2
- lateral periodontal cyst (K09.0)
Medical Intelligence & Overview
A radicular cyst, also known as an apical or periapical cyst, is a type of dental cyst that develops at the apex of a tooth's root. It is the most common cyst associated with tooth infection and is typically caused by chronic inflammation stemming from untreated dental decay or trauma. This cyst forms as a result of the body's response to infection, leading to the formation of a fluid-filled sac at the root tip. Radicular cysts often grow slowly and may not cause noticeable symptoms initially, but they can lead to discomfort, swelling, and other dental complications if left untreated.
Causes & Symptoms
Clinical Causes: Persistent bacterial infection in the root canal system due to untreated dental caries Trauma to a tooth causing pulp necrosis Failed or incomplete root canal treatment Chronic pulpitis or pulp necrosis leading to periapical inflammation Adjacent periodontal infections spreading to the periapical region
Key Symptoms: Mild to severe pain around the affected tooth, especially if secondary infection occurs Swelling in the gums or face near the affected tooth Sensitivity to hot or cold temperatures Feeling of pressure or a lump at the tip of the tooth root Loose or mobile tooth in advanced cases Pus discharge if secondary bacterial infection develops Asymptomatic in early stages, discovered incidentally through dental X-rays
Diagnostic & Treatment
Diagnosis Path: Diagnosis typically involves clinical dental examination and imaging studies. Dentists may perform visual and physical assessments, including probing the tooth and surrounding tissues. Radiographic imaging, primarily periapical X-rays, are essential to visualize the cystic lesion, which appears as a well-defined radiolucent area at the apex of the involved tooth. Advanced imaging techniques, like cone-beam computed tomography (CBCT), can provide detailed 3D views to assess the size and extent of the cyst. Histopathological examination of tissue samples may be performed after surgical removal to confirm the diagnosis.
Treatment Protocols: Treatment options for a radicular cyst often depend on the size and location of the lesion, as well as the condition of the affected tooth. Common approaches include: - **Root canal therapy**: In many cases, root canal treatment can eliminate infection and allow the cyst to resolve naturally. - **Apicoectomy**: Surgical removal of the apex of the tooth root along with the cyst, often performed if root canal therapy is unsuccessful or if the cyst is large. - **Extraction**: Removal of the affected tooth may be necessary if the tooth is irreparably damaged. - **Enucleation or cystectomy**: Surgical removal of the cyst itself, often combined with tooth treatment. Post-treatment follow-up is essential to ensure healing and to monitor for recurrence. In some cases, cysts may resolve completely following appropriate dental procedures, while others may require additional interventions.
Clinical Advice & FAQs
Billing Guidance
Is K04.8 a billable ICD-10 code?
Yes, K04.8 is a specific, billable code that can be used to indicate a diagnosis for reimbursement purposes.
Documentation
How do I report K04.8?
Clinical documentation must specify the nature of Radicular cyst and any associated comorbidities for accurate reporting.
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