CPT Code 00144: Corneal Surgery -- Complete Billing & Coding Guide
What Does CPT Code 00144 Mean?
CPT code 00144 describes anesthesia services provided for procedures on the cornea of the eye, most commonly corneal transplantation (keratoplasty). This code covers penetrating keratoplasty (PKP), Descemet stripping endothelial keratoplasty (DSEK/DMEK), deep anterior lamellar keratoplasty (DALK), and other corneal surgical procedures. Corneal surgery is typically more complex than routine cataract surgery and may involve longer operative times, higher anesthesia requirements, and more postoperative monitoring.
Key Code Attributes:
- Billable Status: Fully billable as a standalone anesthesia service
- Base Units (CMS 2026): 4
- Primary Setting: Hospital outpatient department or ambulatory surgery center
- Provider Type: Anesthesiologist (MD/DO), CRNA with physician supervision, or anesthesia assistant under physician direction
- Service Category: Monitored anesthesia care (MAC) or general anesthesia (GA)
- Effective Status: Active CPT code with no planned retirement (verified through 2026)
- Typical Patient Population: Adults with corneal disease including Fuchs endothelial dystrophy, keratoconus, bullous keratopathy, corneal scarring from infection or trauma, and failed prior grafts
What Services and Procedures Does CPT Code 00144 Cover?
CPT 00144 covers anesthesia for surgical procedures involving the cornea — the transparent anterior portion of the eye. Corneal surgery ranges from partial-thickness lamellar procedures to full-thickness penetrating keratoplasty.
Covered Procedures and Surgical Indications:
- Penetrating keratoplasty (PKP) — full-thickness corneal transplant for keratoconus, corneal scarring, failed graft
- Descemet stripping endothelial keratoplasty (DSEK) — endothelial transplant for Fuchs dystrophy, pseudophakic bullous keratopathy
- Descemet membrane endothelial keratoplasty (DMEK) — thinner endothelial transplant with faster visual recovery
- Deep anterior lamellar keratoplasty (DALK) — anterior stromal transplant leaving host endothelium intact
- Corneal laceration repair — complex full-thickness repair requiring general anesthesia
- Pterygium excision with conjunctival autograft or amniotic membrane graft
- Corneal biopsy for diagnostic purposes
- Removal of corneal sutures under anesthesia
- Phototherapeutic keratectomy (PTK) requiring anesthesia provider
- Keratoprosthesis (artificial cornea) implantation
- Repair of corneal perforation with tissue adhesive
What Does CPT 00144 Specifically Exclude?
| Excluded Procedure | Correct Code | Rationale |
|---|---|---|
| Combined cataract with corneal transplant (triple procedure) | CPT 00140 | Multiple eye structures involved — use broader code |
| Cataract surgery alone | CPT 00142 | Lens-specific procedure |
| Vitreoretinal surgery | CPT 00145 | Posterior segment |
| 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 00144 the Right Code to Use?
Step-by-Step Code Selection
- Confirm the primary procedure is corneal (PKP, DSEK, DMEK, DALK, or corneal repair)
- If combined with cataract surgery, use CPT 00140
- Check patient age — use CPT 00148 for patients under 1 year
- Document anesthesia type — MAC for cooperative patients; GA for complex, long, or uncooperative cases
Comparison With Related Codes
| Code | Procedure | Base Units (2026) |
|---|---|---|
| 00144 | Corneal surgery | 4 |
| 00140 | Eye — general | 4 |
| 00142 | Lens surgery | 4 |
| 00145 | Vitreoretinal | 5 |
| 00147 | Iris procedures | 4 |
| 00148 | Eye — under 1 year | 5 |
Documentation Requirements
Preoperative Documentation: History and physical, ASA classification, airway assessment, anticoagulant/antiplatelet review, anesthesia plan (MAC vs. GA), NPO status. Intraoperative Documentation: Start/stop times, vital signs q5min, anesthetic agents and doses, level of sedation monitoring, oxygen administration method, peribulbar block documentation (if performed), complications (oculocardiac reflex, hypertension, hypoxia). Postoperative Documentation: PACU admission and discharge times, pain scores, PONV assessment and treatment, Aldrete score or equivalent.
Base Unit Assignment
| Component | Value |
|---|---|
| Base Units (CMS 2026) | 4 |
| Time Unit Increment | 15 minutes |
| Physical Status P3 | +1 unit |
| Physical Status P4 | +2 units |
| Physical Status 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 Case |
|---|---|
| AA | Anesthesiologist personally performs service |
| QS | Monitored anesthesia care (MAC) |
| QK | Medical direction of 2-4 concurrent cases |
| QX | CRNA with medical direction |
| QZ | CRNA without medical direction |
| P1-P4 | ASA physical status |
Payer Considerations
- Medicare (CMS): CPT 00144 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 corneal surgery under Medicare Part B, though medical necessity and diagnosis (Fuchs dystrophy, keratoconus, corneal scarring) must be clearly documented. MAC with QS modifier is routinely accepted for corneal procedures. Submit claims with ICD-10 codes such as H18.6 (keratoconus), H18.2 (corneal edema), or H18.8 (other corneal disorders) to support medical necessity.
- Commercial Payers (Aetna, UnitedHealthcare, Cigna, Blue Cross): Most commercial insurers accept CMS base unit assignments for 00144 but apply significantly higher conversion factors ranging from $40 to $100 per unit depending on the plan and geographic region. Prior authorization may be required for elective keratoplasty. Some plans require separate notification when general anesthesia is used instead of MAC. If a claim is denied, appeal with the operative report and anesthesia record demonstrating the complexity of the case and the medical necessity for anesthesia provider involvement.
- State Medicaid Programs: Medicaid reimbursement for anesthesia services varies widely by state. Some state Medicaid programs use a percentage of Medicare rates (typically 80-100% of the Medicare CF) while others have their own fee schedules. Verify your state-specific Medicaid anesthesia policy and any prior authorization requirements for corneal surgery before filing claims.
- Medicare Advantage Plans: These plans may impose additional prior authorization or step-therapy requirements beyond traditional Medicare. Verify coverage and obtain written authorization at least 72 hours before scheduled surgery. Denied claims under Medicare Advantage can be appealed through the plan’s internal grievance process followed by external review.
- Workers Compensation and Auto Insurance: These carriers often reimburse at higher rates than standard commercial plans. Detailed documentation of anesthesia time, medical necessity, and ASA status is essential for claims adjudication. For auto insurance claims, include the relationship of the corneal condition to the motor vehicle accident in the medical record.
- Self-Pay and Cash-Pay Patients: Provide a good-faith estimate of anesthesia charges. For example, an uninsured patient with 11 total units would owe approximately $239 at the Medicare rate. Self-pay discounts or cash-pay packages are often available at ambulatory surgery centers and should be discussed preoperatively.
Real-World Scenario
A 72-year-old male with keratoconus and corneal scarring from long-term contact lens wear presents for penetrating keratoplasty (PKP) of the left eye. Preoperative evaluation reveals ASA III status due to hypertension (well-controlled on lisinopril), COPD (GOLD stage 2, on tiotropium), and obesity (BMI 34). General anesthesia is selected due to the anticipated duration of the case, the patient’s inability to lie flat for extended periods under MAC, and the risk of intraoperative movement during delicate corneal suturing. Total anesthesia time is 90 minutes from induction to PACU handoff.
Coding: CPT 00144 + AA + P3. Base 4, time 6 (90 min / 15 = 6), P3 +1, total 11 units. Estimated payment at Medicare CF of $21.71: 11 x $21.71 = ~$239.
Intraoperative Management: Induction with propofol and rocuronium, maintenance with sevoflurane in O2/air. Intraoperative vitals stable with one episode of mild hypertension (BP 165/92) treated with labetalol 10 mg. Emergence uneventful. PACU discharge after 45 minutes with Aldrete score 10.
Payer Comparison: At Medicare’s $21.71/unit this case reimburses ~$239. At a commercial payer CF of $60/unit, the same 11 units would reimburse ~$660, highlighting why accurate documentation of time and modifiers directly impacts revenue.
Coding Errors to Avoid
- Using 00140 when 00144 is more specific — For cornea-only cases, 00144 is preferred
- Billing regional block separately — Peribulbar/retrobulbar block by anesthesia provider is bundled
- Combined PKP with cataract — Use 00140 (general eye), not 00144
- Missing MAC vs. GA documentation — Document level of anesthesia service clearly
- Bilateral coding issues — Single anesthetic session = one CPT 00144
Real-World Scenario
A 68-year-old female with Fuchs endothelial dystrophy and visually significant corneal edema undergoes DSEK of the right eye under MAC with monitored sedation and peribulbar block. Total anesthesia time is 50 minutes. Patient is ASA II.
Coding: CPT 00144 + AA + P2 + QS. Base 4, time 3, total 7 units. Estimated payment ~$152.
Frequently Asked Questions
Is CPT 00144 the Correct Code for DSEK and DMEK?
Yes. DSEK and DMEK are endothelial keratoplasty procedures on the cornea and are correctly coded with CPT 00144.
These procedures replace only the endothelial layer of the cornea, which is distinct from full-thickness penetrating keratoplasty. However, both approaches map to the same CPT 00144 anesthesia code since the surgical site is the cornea. Document the specific keratoplasty type in the surgical record for clinical clarity, though the anesthesia code remains the same.
What Code Is Used for Combined Corneal Transplant and Cataract Surgery?
When a corneal transplant is combined with cataract extraction (triple procedure), the correct anesthesia code is CPT 00140 (general eye), not 00144, because multiple eye structures are involved.
This is an important distinction because using 00144 for a triple procedure would be considered incorrect coding. The general eye code 00140 also has base units of 4, so there is no financial penalty for using the correct broader code. Always check the operative plan before assigning the anesthesia code.
Is MAC or General Anesthesia More Common for Corneal Surgery?
Both are used. MAC with a peribulbar block is common for DSEK/DMEK. General anesthesia is more common for penetrating keratoplasty, lengthy procedures, and uncooperative patients. From a reimbursement perspective, the anesthesia unit calculation is the same regardless of MAC or GA, so the choice should be guided by patient safety and procedural requirements rather than financial considerations.
Can CPT 00144 Be Billed for Pterygium Surgery?
For routine pterygium excision under topical anesthesia without anesthesia provider involvement, no anesthesia code is reported. For extensive pterygium with conjunctival autograft requiring MAC or GA, CPT 00144 may be appropriate if the cornea is involved. Document the extent of corneal involvement and the medical necessity for anesthesia provider participation in the operative record to support the claim.
Does CPT 00144 Require Prior Authorization for ASCs?
Prior authorization requirements vary by payer. Medicare does not require prior authorization for 00144, but Medicare Advantage and commercial plans may require pre-certification, especially for elective keratoplasty. Verify payer-specific requirements at least one week before scheduled surgery to avoid claim denials.
How Should Anesthesia Time Be Documented for Corneal Surgery?
Anesthesia time begins when the anesthesia provider begins preparing the patient for the induction of anesthesia and ends when the patient is placed under postoperative care. For corneal surgery, include time for peribulbar block placement if performed, as this is part of the anesthesia service.
Key Takeaways
- CPT 00144 is specific to corneal procedures (PKP, DSEK, DMEK, DALK)
- Base units 4 — same as 00140/00142 but specific to cornea
- Combined with cataract = use 00140
- MAC with QS modifier is common; GA for complex cases
- Peribulbar block by anesthesia provider is bundled
- Single code per anesthetic session
References
- CMS PFS: cms.gov
- ASA Relative Value Guide
- Eye Bank Association of America
- American Academy of Ophthalmology
