Summary & Overview
HCPCS A4650: Implantable Radiation Dosimeter, Each
HCPCS Level II code A4650 denotes an implantable radiation dosimeter, a device used to measure delivered ionizing radiation dose at or near an implanted location. This code is relevant for radiation oncology practices, hospital outpatient departments, and ambulatory surgical centers that use implantable dosimeters for treatment verification, quality assurance, and patient safety. Nationally, the code matters as medical teams increasingly adopt precision radiation techniques that rely on in vivo dosimetry to confirm dose delivery and document treatment accuracy.
Key payers addressed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of the clinical context for implantable dosimeters, typical sites of service, and the payer landscape relevant to billing and coverage evaluation. The publication offers benchmarks and policy considerations such as coverage variability among major commercial payers and Medicare, coding conventions for HCPCS Level II reporting, and operational implications for radiation oncology services.
This summary equips clinicians, billing professionals, and policy analysts with a concise reference to what A4650 represents, why it is used in clinical practice, and which national payers are commonly involved. Data not available in the input is noted where applicable.
Billing Code Overview
HCPCS Level II code A4650 describes an implantable radiation dosimeter, each. This device is a small, implantable sensor used to measure the dose of ionizing radiation delivered internally or in the immediate vicinity of the implant site during radiation therapy.
Service type: Implantable radiation monitoring device placement or provision
Typical site of service: Hospital outpatient department, radiation oncology clinic, or ambulatory surgical center, where radiation therapy planning and delivery occur.
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Clinical & Coding Specifications
Clinical Context
A typical patient is an adult oncology patient scheduled to receive external beam radiation therapy for prostate, breast, or head and neck malignancy. The radiation oncology team discusses placement of an A4650 implantable radiation dosimeter to measure in vivo dose at or near the tumor or critical structure. The patient presents to the outpatient radiation oncology procedure suite or ambulatory surgery center. Under local anesthesia with or without conscious sedation, the radiation oncologist or interventional radiologist places the small implantable dosimeter into or adjacent to the target using image guidance (ultrasound, CT, or fluoroscopy). The dosimeter remains in place for planned treatment fractions and is interrogated during or after treatment sessions to verify delivered dose and detect deviations from the planned dose. Typical documentation includes indication for in vivo dosimetry, informed consent, implant technique and site, imaging guidance used, device model/serial number, any complications, and a record of dose readings compared to planned dose. Typical site of service: outpatient radiation oncology clinic, ambulatory surgery center, or hospital outpatient department.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | When billing professional interpretation or physician-performed portion distinct from technical device placement. |