CPT code 76514 – Corneal pachymetry

Key takeaways

CPT code 76514 covers ultrasound (contact) corneal pachymetry, unilateral or bilateral. Optical and OCT-based pachymetry is billed separately under unlisted code 92499.

The code is inherently bilateral, so one unit covers both eyes. Append modifier -52 when only one eye is measured, not modifier -50.

Medicare covers CPT code 76514 once per lifetime per patient for glaucoma suspects, under CMS LCD A56548. A signed ABN is required before any repeat session is billed.

Pabau’s claims management tools help ophthalmology practices flag lifetime-limit alerts and auto-populate ICD-10 pairs before submission.

CPT code 76514: Code description and clinical context

CPT code 76514 describes ophthalmic ultrasound, diagnostic; corneal pachymetry, unilateral or bilateral (determination of corneal thickness).

The procedure measures corneal thickness with a contact ultrasound probe placed on the anesthetized cornea. The descriptor has always been ultrasound-based, and no AMA revision has extended it to optical techniques.

Non-contact optical coherence tomography (OCT) pachymetry is reported with the unlisted code 92499, which CMS LCD article A56548 names for optical pachymetry. Payers commonly value 92499 at about the same level as 76514, but it remains a distinct code.

Corneal thickness measurement matters in two settings. The first is glaucoma evaluation. Thinner corneas produce artificially low intraocular pressure readings on applanation tonometry, which can hide glaucomatous pressure elevation. Pachymetry corrects for that.

The second is pre-surgical corneal assessment. Before LASIK and other refractive procedures, pachymetry confirms that enough stromal thickness remains after the planned tissue removal.

Coverage criteria and covered indications for CPT 76514

Medicare covers CPT code 76514 when it is medically necessary for a covered indication, as detailed in CMS LCD A56548. Settling which diagnoses qualify is the first step in building a clean claim.

Covered indications fall into three broad categories:

• Glaucoma suspects and patients with ocular hypertension, where pachymetry informs how intraocular pressure is read.
• Corneal disease states, where thickness measurement guides clinical management.
• Pre-surgical evaluation before refractive procedures.

Medicare coverage policy and the lifetime limitation

Medicare covers CPT code 76514 once in a lifetime per beneficiary who is a glaucoma suspect or has ocular hypertension, per CMS LCD A56548. The limit belongs to the patient, not to each eye. One unit of 76514 already reports the bilateral service, so no separate allowance is tracked for a second eye.

Before billing a repeat pachymetry session for a Medicare patient, an Advance Beneficiary Notice of Noncoverage (ABN) must be on file. Billing without one once the lifetime limit is exhausted leaves the practice carrying the charge.

Modifier -GA reports that an ABN was issued, which shifts liability for the charge to the patient. Modifier -GZ reports an expected denial with no ABN on file, and the practice writes the charge off. Modifier -GY is a different signal again, reserved for a service Medicare excludes by statute.

Commercial payers vary. Many impose no lifetime limit at all, so review each payer’s clinical policy bulletin before assuming one applies.

ICD-10 codes that support CPT code 76514 claims

Every CPT code 76514 claim requires a linked ICD-10-CM diagnosis code that establishes medical necessity. The table below lists the codes recognized under CMS LCD A56548. Sending the claim with an unsupported diagnosis is the fastest route to a medical necessity denial.

Laterality matters here. Submitting H40.00 without its laterality character will trigger an edit in many payer systems. Use the most specific available code, and check it against the covered list in the applicable LCD before you submit. The ICD-10-CM code library carries the descriptor and coding notes for each diagnosis above.

Modifiers for CPT code 76514

Because CPT code 76514 is inherently bilateral, modifier selection is the most common source of billing confusion. One billed unit of 76514 already represents the bilateral procedure.

Appending modifier -50 to an inherently bilateral code typically results in incorrect double-payment or a payer rejection, unless that payer’s policy explicitly requires it.

The practical rule is short. Bilateral pachymetry on the same date bills as one unit of CPT code 76514, with no modifier. Unilateral pachymetry bills as one unit with modifier -52 appended. Check the payer’s own policy before adding -50 to any 76514 claim.

Medicare reimbursement rates for CPT code 76514

Medicare reimbursement for CPT code 76514 is set by the CMS Medicare Physician Fee Schedule (MPFS). The 2026 national unadjusted rate is about $11.69 for a bilateral session. That figure comes from 0.35 total RVUs multiplied by the 2026 conversion factor of $33.4009. Facility and non-facility payment is identical for this code.

Geographic Practice Cost Index (GPCI) adjustment moves the payment up or down by locality. Use the CMS MPFS lookup tool with your locality code for an accurate figure.

Commercial payer rates vary substantially. Some payers reimburse at a percentage of the Medicare fee schedule, while others work from separately negotiated contract rates.

Reading the remittance advice after each 76514 payment shows which payers sit below the expected rate, which is what a contract renegotiation needs. Catching an underpayment early also keeps it inside the appeal window.

Related CPT codes commonly billed with 76514

Corneal pachymetry rarely stands alone in a glaucoma workup. Knowing which codes are commonly co-billed, and whether NCCI bundling edits apply, prevents unnecessary claim holds. Verify NCCI edits through the AAPC CPT code lookup or the CMS NCCI Policy Manual before routinely pairing codes.

Documentation requirements for CPT code 76514

Thorough documentation is what turns a medically appropriate service into a payable claim. CMS LCD A56548 and most commercial payer policies name specific elements the medical record has to carry for CPT code 76514. Capturing each of them at the time of service is what keeps the claim out of a retrospective audit.

• Medical indication: The clinical reason for pachymetry must be recorded in the encounter note, not implied by a diagnosis code alone. State why corneal thickness measurement is needed for this patient on this date.
• Technique used: Record that ultrasound (contact) pachymetry was performed, since that is what 76514 reports. If an optical or OCT device was used instead, the service belongs on unlisted code 92499, and the note should say so.
• Measurement results: Record the corneal thickness readings in micrometers for each eye measured. Vague notes (“pachymetry performed”) are not sufficient.
• Eye(s) examined: Specify which eye or eyes were measured. This supports correct modifier assignment and satisfies laterality requirements.
• Ordering provider attestation: The performing or supervising physician must sign and date the note. Unsigned or undated notes are a common audit finding.
• ICD-10 linkage: The documented diagnosis must map directly to a covered ICD-10-CM code. A code sitting in the problem list but never referenced in today’s encounter note may not satisfy medical necessity review.

First-pass acceptance rates move further at the documentation stage than at the submission stage. A complete record before submission is always faster than an appeal after a denial.

Billing errors to avoid with CPT code 76514

Every 76514 denial below is catchable at the desk, before the claim goes out. Working these checks into a pre-submission routine is what separates a clean claim from a month-long appeal.

• Appending modifier -50 to an inherently bilateral code: Sending -50 with 76514 may trigger a duplicate claim edit or overpayment recovery. Use -52 for unilateral, and no modifier for bilateral.
• Billing after the Medicare lifetime limit without an ABN: The limit is per patient, not per eye. Any repeat 76514 claim past it needs a signed ABN on file. Without the ABN, liability shifts back to the practice.
• Missing ICD-10 linkage: Submitting 76514 without a covered ICD-10-CM code in field 21 will generate a medical necessity denial. The code must also be linked in field 24E, however thorough the clinical note is.
• Billing non-covered indications for Medicare: Pre-refractive surgery pachymetry on a Medicare patient without a qualifying glaucoma or corneal disease diagnosis is not covered. Document an independent covered indication if one exists, and otherwise counsel the patient before service.
• Billing optical pachymetry as 76514: Some practices report OCT-based corneal measurement under 76514, which the descriptor does not cover. CMS LCD article A56548 directs optical pachymetry to the unlisted code 92499 instead. Audit your billing templates so the two techniques map to separate codes.

The same rules read more usefully as a sequence to run before the claim leaves the practice.

How practice management software streamlines CPT 76514 billing

The errors above share one cause. Manual checks are being applied to a code with layered rules. Practice management software like Pabau holds those rules at the point of care instead. Built-in CPT and ICD-10 catalogues put the right code pairs in front of the clinician while the encounter is charted.

Practices carrying Medicare patients with several ophthalmic diagnoses get the most out of cleaner claims management. The workflow flags a prior 76514 claim before the next encounter is booked, so the ABN conversation happens in advance rather than after a denial.

Claims then submit electronically to US payers through our Claim.MD clearinghouse integration. Modifier rules and ICD-10 linkage are reviewed before the CMS-1500 leaves the practice. Remittance advice reconciles automatically, so an underpayment surfaces within days instead of at the end of a quarter.

Reduce 76514 claim denials with smarter billing workflows

Pabau’s integrated claims tools help ophthalmology practices auto-populate ICD-10 pairs, flag Medicare lifetime limits, and submit cleaner 76514 claims through our Claim.MD clearinghouse integration.

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Conclusion

Three rules govern most of the billing complexity around CPT code 76514. It is inherently bilateral, Medicare covers it once per lifetime per patient, and the descriptor is ultrasound-only.

Optical and OCT pachymetry stays on unlisted code 92499. Practices that build those rules into a pre-encounter checklist spend far less time on appeals.

Almost all of the work on a 76514 claim pays off before the encounter, not after the denial. Built-in modifier rules and a clearinghouse connection take the manual checking out of submission. Book a demo to see how Pabau handles ophthalmology claims from charge entry through remittance.

Continue your research

Need to understand claim denials at a deeper level? Denial management in healthcare covers root causes, appeal workflows, and prevention strategies for ophthalmology and other specialties.

Want to see how clearinghouse submission works in practice? The 837 electronic claim file guide explains how CPT and ICD-10 data flows from your EHR to payers through a clearinghouse.

Looking for billing compliance guidance? Superbill documentation best practices shows how to structure encounter records that survive audit scrutiny.

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