Summary & Overview
HCPCS Level II C1842: Retinal Prosthesis System, Internal and External Components
HCPCS Level II code C1842 denotes an implantable retinal prosthesis system including all internal and external components, coded as an add-on to C1841. Retinal prostheses are specialized devices intended to restore some visual perception for patients with severe retinal degenerative conditions and represent a high-cost, high-complexity implantable technology with implications for device coverage, surgical infrastructure, and long-term follow-up care nationwide.
Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of how the code is defined, typical sites of service where implantation and initial programming occur, and the clinical context for use. The publication outlines benchmark considerations for utilization and coverage pathways, common billing and coding relationships (including its status as an add-on code to C1841), and policy updates that affect payment and prior authorization practices.
The report provides a concise reference for payers, billing teams, and clinical program managers seeking clarity on service classification, expected care settings, and the administrative considerations tied to deploying retinal prosthesis technology at scale. Data not available in the input is identified where applicable.
Billing Code Overview
HCPCS Level II code C1842 describes a retinal prosthesis, includes all internal and external components; add-on to C1841. This code represents a medical device system implanted to provide visual function by electrically stimulating the retina and includes both implanted (internal) components and external components needed for operation.
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Service type: Implantable retinal prosthesis system (device implantation and associated device components)
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Typical site of service: Hospital inpatient or outpatient surgery center where implantation and device programming occur
Clinical & Coding Specifications
Clinical Context
A 58-year-old patient with advanced retinitis pigmentosa and profound central vision loss is evaluated in a tertiary ophthalmology clinic for consideration of a retinal prosthesis. Visual acuity is light perception only and prior medical management and low-vision services have been exhausted. Multidisciplinary evaluation includes retinal surgery, neuro-ophthalmology, low-vision rehabilitation, and device counseling. After device selection and informed consent, the patient undergoes staged surgery: implantation of the internal retinal prosthesis components (scleral/epiretinal array and internal electronics) typically as an inpatient or outpatient ambulatory surgical center procedure under monitored anesthesia care or general anesthesia. The external components (power source, transmitter, and external processor) are fitted and activated in subsequent outpatient visits for programming and rehabilitation. Perioperative workflow includes preoperative imaging (ocular ultrasound, OCT), anesthesia clearance, device inventory verification, sterile implantation, documentation of device model and serial numbers, and post-op device programming visits. Billing uses the HCPCS code C1841 for the primary retinal prosthesis and C1842 as the add-on code for additional internal and external components. Typical site of service is an ambulatory surgical center or hospital outpatient department with follow-up in a specialized ophthalmology or low-vision clinic. Common patient modifiers applied reflect anesthesia, multiple surgeons, or unusual procedural circumstances.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|