CPT Code 00145: Vitreoretinal Surgery -- Complete Billing & Coding Guide
What Does CPT Code 00145 Mean?
CPT code 00145 describes anesthesia services provided for vitreoretinal surgery — procedures involving the vitreous humor, retina, and posterior segment of the eye. This code covers pars plana vitrectomy, retinal detachment repair, epiretinal membrane peel, macular hole repair, and other complex posterior segment surgeries. With base units of 5, this code reflects the higher complexity, longer operative times, and greater anesthesia requirements compared to anterior segment procedures.
Key Code Attributes:
- Billable Status: Fully billable as a standalone anesthesia service
- Base Units (CMS 2026): 5 — higher than other eye codes (00140-00144 at 4)
- Primary Setting: Hospital outpatient department or ambulatory surgery center
- Provider Type: Anesthesiologist (MD/DO), CRNA with physician supervision
- Service Category: Monitored anesthesia care (MAC) or general anesthesia
- Effective Status: Active CPT code with no planned retirement (verified through 2026)
- Typical Patient Population: Adults with retinal detachment, macular hole, epiretinal membrane, vitreous hemorrhage, diabetic retinopathy complications, or retained lens fragments
What Services and Procedures Does CPT Code 00145 Cover?
CPT 00145 covers anesthesia for surgical procedures involving the vitreous and retina — the posterior segment of the eye. These procedures are typically more complex, longer in duration, and require more intensive anesthesia management than anterior segment surgery.
Covered Procedures and Surgical Indications:
- Pars plana vitrectomy (PPV) — 23-gauge, 25-gauge, or 27-gauge
- Retinal detachment repair — pneumatic retinopexy, scleral buckle, or vitrectomy with gas or silicone oil tamponade
- Epiretinal membrane peel
- Macular hole repair
- Vitreous hemorrhage clearance (diabetic, traumatic)
- Retained lens fragment removal (posterior segment)
- Endophthalmitis treatment — vitrectomy with intravitreal antibiotics
- Intraocular foreign body removal (posterior segment)
- Subretinal injection or gene therapy delivery
- Retinectomy or retinotomy
- Choroidal biopsy or tumor resection
- Vitreous biopsy for diagnostic purposes
What Does CPT 00145 Specifically Exclude?
| Excluded Procedure | Correct Code | Rationale |
|---|---|---|
| Corneal transplant alone | CPT 00144 | Anterior segment procedure |
| Cataract surgery alone | CPT 00142 | Anterior segment |
| Combined vitrectomy with cataract | CPT 00145 | Primary procedure determines code |
| Glaucoma surgery | CPT 00140 | Broader eye code |
| Strabismus correction | CPT 00140 | Extraocular muscle procedure |
| Pediatric eye surgery (under 1 year) | CPT 00148 | Age-specific code |
When Is CPT Code 00145 the Right Code to Use?
Step-by-Step Code Selection
- Confirm the primary procedure involves the vitreous or retina (posterior segment)
- Vitrectomy with membrane peel or retinal detachment repair are the most common indications
- If combined with cataract extraction, CPT 00145 remains correct as the primary posterior segment procedure
- Document anesthesia type — GA is common for longer cases; MAC for shorter vitrectomies
Comparison With Related Codes
| Code | Procedure | Base Units (2026) |
|---|---|---|
| 00145 | Vitreoretinal surgery | 5 |
| 00140 | Eye — general | 4 |
| 00142 | Lens surgery | 4 |
| 00144 | Corneal surgery | 4 |
| 00147 | Iris procedures | 4 |
| 00148 | Eye — under 1 year | 5 |
Documentation Requirements
Preoperative: History and physical, ASA classification, airway assessment, anticoagulant/antiplatelet review (critical — may affect surgical approach), anesthesia plan (MAC vs. GA), NPO status. Diabetic and hypertensive patients are common — document disease control status.
Intraoperative: Start/stop times, vital signs q5min, anesthetic agents and doses, level of sedation monitoring, airway management, oculocardiac reflex monitoring (common during retinal detachment repair), fluid management, blood pressure control (avoid hypertension to reduce intraocular bleeding).
Postoperative: PACU admission and discharge times, pain scores, PONV assessment, Aldrete score, visual acuity check.
Base Unit Assignment
| Component | Value |
|---|---|
| Base Units (CMS 2026) | 5 |
| Time Unit Increment | 15 minutes |
| P3 | +1 unit |
| P4 | +2 units |
| P5 | +3 units |
Reimbursement
Note: Anesthesia services use a unit-based formula, not RVUs. Medicare payment = (Base Units + Time Units + Modifying Units) x Anesthesia Conversion Factor. The 2026 Medicare anesthesia CF is approximately $21.71 (varies by locality). Commercial payer CFs are typically 2-5x higher.
Common Modifiers
| Modifier | Use |
|---|---|
| AA | Personally performed |
| QS | MAC service |
| QX/QZ | CRNA |
| P1-P4 | ASA status |
Payer Considerations
- Medicare (CMS): CPT 00145 is a covered service under the Medicare Physician Fee Schedule. Reimbursement follows the anesthesia unit-based formula using the $21.71 Medicare conversion factor. No prior authorization is typically required for vitreoretinal surgery under Medicare Part B, though medical necessity (retinal detachment, macular hole, vitreous hemorrhage) must be clearly documented. General anesthesia is commonly accepted without additional review. Use appropriate ICD-10 codes such as H33.0 (retinal detachment with break), H35.3 (macular hole), or H43.8 (vitreous degeneration) to support the claim.
- Commercial Payers (Aetna, UnitedHealthcare, Cigna, Blue Cross): Most commercial insurers accept CMS base unit assignments for 00145 but apply higher conversion factors ranging from $40 to $100 per unit. Prior authorization may be required for elective vitreoretinal procedures such as macular hole repair or epiretinal membrane peel. Emergency cases such as retinal detachment or endophthalmitis are typically exempt from auth requirements. If a prior authorization is denied, request a peer-to-peer review with the plan’s medical director to discuss the surgical and anesthesia indications.
- State Medicaid Programs: Medicaid reimbursement for anesthesia varies by state, with some programs paying 80-100% of the Medicare anesthesia conversion factor and others maintaining separate fee schedules. Check your state’s Medicaid anesthesia policy and verify whether prior authorization is needed for posterior segment eye surgery before submitting claims.
- Medicare Advantage Plans: May impose additional prior authorization requirements beyond traditional Medicare, especially for elective posterior segment procedures. Verify coverage and obtain written authorization before surgery. Track authorization numbers and effective dates carefully to prevent claim denials.
- Workers Compensation and Auto Insurance: These carriers reimburse at higher rates than standard commercial plans. Detailed documentation of anesthesia time, ASA status, and the relationship of the surgery to the work injury or accident is essential for claims adjudication.
- Self-Pay and Cash-Pay Patients: Provide a good-faith estimate using the unit-based formula. For example, an uninsured patient with 10 total units would owe approximately $217 at the Medicare rate. ASCs and surgical centers often offer self-pay discounts and should discuss payment options preoperatively.
Real-World Scenario
A 65-year-old female with a full-thickness macular hole (stage 4) and epiretinal membrane presents for 25-gauge pars plana vitrectomy with internal limiting membrane peel and gas tamponade under general anesthesia. The patient has no significant comorbidities and is classified as ASA II. General anesthesia is selected to ensure complete immobility during delicate membrane peeling and to maintain controlled intraocular pressure throughout the case. Total anesthesia time is 75 minutes from induction start to PACU arrival.
Coding: CPT 00145 + AA + P2. Base 5, time 5 (75 min / 15 = 5), P2 +0, total 10 units. Estimated payment at Medicare CF of $21.71: 10 x $21.71 = ~$217.
Intraoperative Management: Induction with propofol and succinylcholine to facilitate rapid sequence intubation given fasting concerns. Maintenance with desflurane in O2/air with remifentanil infusion. No oculocardiac reflex episodes noted. Controlled hypotension maintained at MAP 70-80 mmHg to reduce intraocular bleeding risk. Emergence smooth with ondansetron for PONV prophylaxis.
Payer Comparison: At Medicare’s $21.71/unit this case reimburses ~$217. At a commercial payer CF of $70/unit, the same 10 units would reimburse ~$700, demonstrating how commercial payer mix significantly affects anesthesia practice revenue.
Coding Errors to Avoid
- Using 00140 instead of 00145 — Vitreoretinal surgery has higher base units (5 vs. 4)
- Billing regional block separately — Peribulbar/retrobulbar block by anesthesia is bundled
- Missing MAC vs. GA documentation — GA is more common for longer cases
- Combined vitrectomy with cataract — Use 00145 (primary posterior segment code)
Real-World Scenario
A 55-year-old diabetic male with tractional retinal detachment and vitreous hemorrhage undergoes 25-gauge pars plana vitrectomy with endolaser and gas tamponade under general anesthesia. Total anesthesia time is 75 minutes. Patient is ASA III (diabetes with end-organ damage).
Coding: CPT 00145 + AA + P3. Base 5, time 5, P3 +1, total 11 units. Estimated payment ~$239.
Frequently Asked Questions
Why Does CPT 00145 Have Higher Base Units?
CPT 00145 has base units of 5 (vs. 4 for 00140-00144) because vitreoretinal surgery typically involves longer operative times, higher complexity, greater potential for complications (oculocardiac reflex, bleeding, hypotony), and more intensive anesthesia requirements.
Is General Anesthesia Required for Vitreoretinal Surgery?
General anesthesia is common for longer vitreoretinal cases (retinal detachment repair, complex vitrectomy) to ensure patient immobility and controlled ventilation. MAC may be appropriate for shorter procedures in cooperative patients.
When MAC is selected, the anesthesia provider must document the level of sedation and the patient’s ability to remain still during critical portions of the case such as membrane peeling or laser application. Any conversion from MAC to GA during the case should be documented with the reason for conversion.
What Is the Oculocardiac Reflex in Vitreoretinal Surgery?
The oculocardiac reflex (bradycardia, hypotension) is triggered by traction on the extraocular muscles or pressure on the globe — common during scleral buckle placement and retinal detachment repair. Anesthesia providers must monitor for OCR and be prepared to intervene.
Immediate treatment includes asking the surgeon to release traction, administering anticholinergic agents such as atropine or glycopyrrolate, and supporting blood pressure with fluids or vasopressors if needed. Document any OCR episode in the anesthesia record, including the heart rate nadir, interventions performed, and resolution time.
Can CPT 00145 Be Billed for Intravitreal Injections?
No. Intravitreal injections (anti-VEGF, steroids) are office-based procedures typically performed under topical anesthesia without anesthesia provider involvement. No anesthesia code is reported.
How Does Silicone Oil Tamponade Affect Anesthesia Documentation?
Silicone oil tamponade is used for complex retinal detachments and requires longer surgical time and more positioning constraints. Document the type of tamponade (gas vs. silicone oil) in the anesthesia record, as silicone oil cases may involve longer operative times and higher anesthesia units. Accurate documentation of the longer time directly translates to higher total units and increased reimbursement under the unit-based formula.
What Documentation Supports Medical Necessity for 00145?
Medical necessity for vitreoretinal anesthesia is supported by the surgical indication and the complexity of the planned procedure. Document the specific diagnosis (retinal detachment, macular hole, vitreous hemorrhage), the planned surgical approach (gauge, tamponade type), and why anesthesia provider involvement is required. Append relevant ICD-10 codes to the claim to substantiate medical necessity.
Key Takeaways
- CPT 00145 is specific to vitreoretinal surgery (posterior segment)
- Base units 5 — higher than other eye codes (4) due to complexity
- GA is common; MAC for select shorter cases
- OCR monitoring is essential — document any interventions
- Combined with cataract = still 00145 (primary code)
- Single code per anesthetic session
References
- CMS PFS: cms.gov
- ASA Relative Value Guide
- American Society of Retina Specialists
- American Academy of Ophthalmology
