Summary & Overview
CPT 0450T: Subconjunctival Aqueous Drainage Device Implantation
CPT code 0450T covers implantation of an additional aqueous drainage device placed with its tip in the subconjunctival space to drain aqueous humor and reduce intraocular pressure in glaucoma patients. This procedure represents a minimally invasive surgical option in the evolving landscape of glaucoma management and matters nationally as payers and providers assess access, coding clarity, and coverage policies for newer ocular drainage technologies.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise operational and clinical context for the code, typical sites of service, and an overview of payer coverage considerations. The publication also summarizes benchmark topics such as utilization patterns, reimbursement guidance, and documentation elements relevant to billing for implantation of subconjunctival aqueous drainage devices.
The report is intended to help clinical, billing, and policy stakeholders understand where 0450T fits within glaucoma procedural coding, what to expect from major national payers, and which clinical details drive coding and coverage determinations. Data not available in the input will be noted where applicable.
Billing Code Overview
CPT code 0450T describes the insertion of an additional aqueous drainage device into the interior of the eye with its distal end positioned in the subconjunctival space. The device does not include a reservoir; it serves to drain aqueous fluid and lower intraocular pressure in patients with glaucoma.
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Service type: Surgical implant procedure for glaucoma drainage (implantation of a non-reservoir subconjunctival aqueous drainage device)
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Typical site of service: Ambulatory surgical center or hospital outpatient department, performed in an ophthalmic surgical setting under sterile conditions
Clinical & Coding Specifications
Clinical Context
A 68-year-old patient with medically uncontrolled primary open-angle glaucoma presents to an ophthalmology ambulatory surgical center after progressive visual field loss and elevated intraocular pressure despite maximal tolerated topical and/or oral therapy. The surgeon performs implantation of a subconjunctival aqueous drainage device to lower intraocular pressure. Typical workflow: preoperative evaluation by the glaucoma specialist including visual acuity, slit-lamp exam, gonioscopy, optic nerve assessment, visual field testing, and medication review; informed consent and preoperative anesthetic assessment; the procedure performed in an operating room or procedure suite under monitored anesthesia care or regional/local anesthesia; placement of the device with its distal end in the subconjunctival space to drain aqueous humor; intraoperative confirmation of flow and conjunctival closure; postoperative recovery with topical antibiotics and steroids, and follow-up visits for IOP checks and bleb evaluation. Typical site of service: outpatient ambulatory surgery center or hospital outpatient department. Service type: ophthalmic surgical supply and implant procedure for glaucoma (minimally invasive glaucoma surgery with subconjunctival drainage device). Typical patient scenario: adult with uncontrolled glaucoma despite medications and/or previous trabeculectomy or tube shunt failure who requires an additional subconjunctival drainage device to lower intraocular pressure.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | No modifier | Standard reporting when no modifier applies |
22 | Increased procedural services | Use when the work required to place the device is substantially greater than typical due to complexity |
23 | Unusual anesthesia | Use when procedure is performed under general anesthesia due to unusual circumstances |
52 | Reduced services | Use when procedure is partially reduced or not completed as originally planned |
53 | Discontinued procedure | Use when procedure is started but terminated due to patient-related or system reasons |
62 | Two surgeons | Use when two surgeons with distinct, documented roles perform portions of the procedure |
66 | Surgical team | Use when a surgical team performs the procedure per institutional policy |
78 | Return to OR for related procedure during global period | Use when a related, therapeutic procedure for a complication of the implant is performed during the global period |
80 | Assistant surgeon | Use when an assistant surgeon is documented and required |
AS | Physician assistant, nurse practitioner, or clinical nurse specialist services in ambulatory surgical center | Use when an APP provides services in the ASC setting |
| Taxonomy Code | Specialty | Notes |
|---|---|---|
| 207W00000X | Ophthalmology | Glaucoma surgeons and general ophthalmologists who perform surgical glaucoma procedures |
| 207WP3000X | Ophthalmic Plastic and Reconstructive Surgery | Ophthalmic subspecialists who may perform complex ocular surface or conjunctival work related to device placement |
| 226E00000X | Optometrist | Pre- and postoperative care in some settings; surgical procedures performed only where state scope allows |
| 363A00000X | Physician Assistant | Common surgical team member providing perioperative and ASC services |
| 363L00000X | Nurse Practitioner | Common provider in perioperative and follow-up management |
Related Diagnoses
| ICD-10 Code | Description | Clinical Relevance |
|---|---|---|
H40.11X1 | Primary open-angle glaucoma, mild stage | Common indication for subconjunctival drainage device to lower IOP when meds are insufficient |
H40.11X2 | Primary open-angle glaucoma, moderate stage | Procedure indicated for progressive disease to preserve visual field |
H40.11X3 | Primary open-angle glaucoma, severe stage | Advanced disease where surgical intervention is often required |
H40.13X0 | Low-tension glaucoma, unspecified eye | Some patients with normal-tension glaucoma may receive surgical drainage when progression occurs |
H40.2210 | Primary open-angle glaucoma suspect, unspecified eye | Preoperative evaluation may include suspects progressing to require surgery |
Related CPT Codes
| CPT Code | Description | Relationship to This Procedure |
|---|---|---|
65820 | Trabeculectomy ab externo with or without intraoperative antimetabolite (eg, mitomycin) | Alternative or prior filtering procedure; may be performed before or instead of subconjunctival device placement |
66180 | Implantation of internal drainage device (aqueous shunt) without external reservoir (eg, nonvalved tube) | Similar category of glaucoma drainage implants; may be performed in cases requiring a traditional tube shunt rather than a minimally invasive subconjunctival device |
66984 | Extracapsular cataract removal with insertion of intraocular lens (IOL) | Often performed concurrently or staged with glaucoma surgery in patients with coexisting visually significant cataract |
67028 | Intravitreal injection of a pharmacologic agent | Postoperative intervention that may be used if intraocular inflammation or other retinal issues arise (not routine for glaucoma implant but performed in some combined cases) |
0100T | Insertion of aqueous drainage device, internal, without reservoir, with distal subconjunctival implantation (example related Category III codes exist for emerging devices) | Procedures for similar devices or device-specific temporary codes that may be reported when applicable |