CPT code 65820: Goniotomy RVUs, modifiers, and 2026 fees

Key takeaways

CPT code 65820 covers goniotomy, an ab interno incision of the trabecular meshwork that lowers intraocular pressure.

Medicare pays roughly $723.46 for 65820 in 2026, built on 8.69 work RVUs and 21.66 total RVUs.

The 090-day global period bundles routine post-op care, so a standard IOP check inside that window is not billable.

CMS Billing and Coding Article A56866 expects at least 3 clock hours of trabecular meshwork treated before 65820 applies.

Practice management software like Pabau connects operative documentation to claims submission, so the codes already on file reach the claim form.

CPT code 65820 is the billing code for goniotomy. The surgeon incises the trabecular meshwork from inside the eye to improve aqueous outflow and lower intraocular pressure. Medicare pays roughly $723.46 for it in 2026, on 21.66 total RVUs, and the code carries a 90-day global period.

Those two numbers shape almost every billing decision that follows. Goniotomy also sits inside the MIGS bundling rules, so laterality, diagnosis stage, and the operative note all have to agree.

Below you get the current RVUs, the 2026 fee schedule, the ICD-10 pairings, the modifiers that apply, and a pre-submission check.

What CPT code 65820 covers, down to the clock hours

CPT 65820 covers a goniotomy, and the short descriptor is simply Goniotomy. The code sits in the Incision Procedures on the Anterior Chamber of the Eye section of the CPT code set.

The surgeon works ab interno, from inside the eye, using a gonioscopy lens and a goniotome or a similar blade.

The descriptor hides a threshold that matters at claim time. CMS Billing and Coding Article A56866 defines goniotomy as incising or excising at least 3 clock hours of trabecular meshwork.

The point is to open the meshwork into Schlemm’s canal. Treat less than that and the note will not support 65820.

Gonioscopy-Assisted Transluminal Trabeculotomy (GATT) and other ab interno trabeculotomy techniques are reported under 65820. Watch the wording here. GATT is a trabeculotomy, not a trabeculoplasty, and laser trabeculoplasty is a separate procedure with its own code, 65855.

According to the American Medical Association (AMA), CPT is the standard code set mandated under HIPAA for reporting physician procedures.

The RVUs behind 65820 moved, and old estimates run low

CPT 65820 carries a work RVU of 8.69 and a total RVU of 21.66. The total is the same whether the service is billed in a facility or a non-facility setting.

You can confirm both figures in the FastRVU RVU lookup tool or the CMS Physician Fee Schedule lookup.

Plenty of reference pages still show a work RVU of 7.31 for this code. That figure is stale, and any fee estimate built on it lands well below what Medicare now allows.

CMS republishes RVUs each year in the Physician Fee Schedule Final Rule, normally effective January 1. Pull the current file before you use these values in a payer negotiation.

What Medicare pays for a goniotomy in 2026

The 2026 national average Medicare payment for CPT 65820 is about $723.46. That number holds in both facility and non-facility settings, because the total RVU does not change between them.

Treat $723.46 as an average rather than a promise. Run your ZIP code through the CMS Physician Fee Schedule lookup for the allowable your MAC will pay. It applies the geographic practice cost index to each RVU component, then multiplies by the current conversion factor.

Coverage rests on one line in the pre-op record

Medicare covers goniotomy when the record shows open-angle glaucoma with intraocular pressure that medical therapy has not controlled.

Each Medicare Administrative Contractor (MAC) publishes its own coverage rules, so the operative and pre-operative notes have to carry the clinical story together.

• Primary indication: open-angle glaucoma with IOP not controlled by maximum tolerated medical therapy
• Secondary indication: congenital or juvenile glaucoma, where goniotomy is often the first surgical choice
• Documentation trigger: a prior trial of at least one topical hypotensive medication, or a documented contraindication to it
• Same-session devices: article A56866 says not to report 65820 alongside a stent insertion or a Schlemm’s canal implant
• MAC variation: several contractors publish goniotomy-specific bulletins, so read yours before billing concurrent procedures

Prior authorization is worth settling early too. Traditional Medicare does not require it for 65820, but plenty of Medicare Advantage and commercial plans do.

Two digits in the H40 code decide whether you get paid

Every 65820 claim needs at least one ICD-10-CM diagnosis code, and the H40 series does most of the work. The trouble is in the last two characters.

In the H40.11 subcategory the 6th character carries laterality and the 7th carries glaucoma stage, and coders regularly collapse the two into one.

Laterality has to match the operative eye on both lines of the claim. H40.1120 with a right-eye goniotomy is a denial before a human ever reads the note.

Stage matters as well, so code the stage the chart supports and reach for a stage-unspecified code only when the record genuinely does not say.

Only three modifiers really belong on a goniotomy claim

Three modifiers carry almost every goniotomy claim: -RT, -LT, and -50. Add -22 or -53 when the operative course justifies it, and stop there.

Skip the eyelid modifiers. -E1 through -E4 identify eyelid positions, so they belong on chalazion excision, epilation, and punctal plug claims.

Goniotomy happens inside the anterior chamber, which makes an eyelid modifier on 65820 a coding error rather than a precaution.

Medicare and most commercial payers reject an ophthalmology surgical line with no laterality modifier. Add it at the claim line, not only in the chart note. The AAPC CPT code reference and your MAC’s billing bulletin are the two places to confirm current modifier policy.

The 90 days after surgery are already paid for

CPT 65820 carries a 090-day global period. One payment covers the pre-operative visit the day before surgery, the surgery itself, and 90 days of routine post-operative care.

• Included in the global fee: E/M visits for normal recovery, suture removal, IOP checks tied to the surgical result, and routine dressing changes
• Separately billable: an unrelated condition, a complication that returns the patient to the OR, or a new diagnosis that arises on its own
• The judgment call: a post-op IOP check is bundled when it evaluates the surgery, and billable when it evaluates something else

Post-op IOP monitoring causes more global-period errors than any other visit type. If the check exists to see whether the goniotomy worked, it is bundled. If the same patient turns up with new retinal pathology, the visit stands on its own with modifier -24 and a note that explains why.

When 65820 can share a claim, and when it cannot

Goniotomy shares an operating session with cataract surgery or a stent more often than it stands alone, and that is where the bundling rules bite.

CMS Billing and Coding Article A56866 is the document to read. The National Correct Coding Initiative (NCCI) edits are the mechanics that enforce it.

One deleted-code trap is worth naming. Codes 0191T and 0376T disappeared on January 1, 2022, so an internal cheat sheet that still pairs 65820 with either one is out of date.

NCCI edits also change quarterly, so pull the current NCCI edit tables before each billing cycle. When -59 or XS bypasses an edit, the operative note has to prove the two procedures were genuinely distinct.

How a goniotomy claim moves from note to payment

Here is the path a goniotomy charge takes, and the point at which each step tends to fail.

1. The surgeon dictates the operative note, naming the eye, the gonioscopy lens, the instrument, and the clock hours treated.
2. A coder pulls 65820, the matching H40 code, and the laterality modifier straight from that note.
3. The charge posts to the encounter, and the claim leaves as an 837P through the clearinghouse.
4. The payer runs its edits, starting with NCCI pairs, then checking the modifier against the diagnosis laterality.
5. A remittance advice comes back, and the payment posts or the denial routes to appeals.

Steps two and four are where the money leaks. A note that says only “anterior segment surgery” gives the coder nothing to work from. A laterality mismatch fails an automated edit before any human sees the claim. Both problems start in the note, which is why the check below beats the appeal.

Codes that look like 65820 but bill differently

The surgical approach decides which code applies, and these neighbors are not interchangeable. Read the operative note before you read the code list.

Run this check before the claim leaves the building

Five items catch most goniotomy denials, and all five live in the operative note. Work through them once and the claim usually pays first time.

The five-point pre-submission check

1. The operative eye is named in the note, and -LT or -RT sits on the claim line.
2. The ICD-10 laterality digit matches that same eye.
3. The note states the clock hours or degrees of trabecular meshwork treated.
4. The gonioscopy lens and the instrument are both named.
5. Any same-session device or canaloplasty has been checked against the current NCCI edits.

Keeping a written clean claim submission checklist for ophthalmology surgical codes turns that into a habit rather than a memory test.

What the operative report must include

• Patient positioning and anesthetic method
• The gonioscopy lens type used for visualization
• Explicit identification of the trabecular meshwork as the operative target
• The instrument used, such as a goniotome, Kahook Dual Blade, Trabectome, or a suture for GATT
• The extent of meshwork treated, in clock hours or degrees of angle
• The operative eye, stated in words rather than implied
• Any intraoperative complication and how it was managed
• For GATT, the aqueous egress or reflux that confirms canal access

Where goniotomy claims most often go wrong

• No laterality modifier: a line with no -LT or -RT is the single most frequent automatic denial
• Wrong ICD-10 laterality: H40.1120 on a right-eye case trips a mismatch edit
• No gonioscopy documentation: “intraocular surgery performed” tells the payer nothing about the angle
• Fewer than 3 clock hours: a minimal or incidental incision does not meet the 65820 descriptor
• Wrong MIGS choice: billing 65820 separately when 66989 or 66991 already covers the session
• Global period slips: a routine post-op IOP check submitted as a standalone E&M visit

Each of those comes back with its own remark code, and the remark code tells you whether to correct and resubmit or open an appeal. Our reference on denial codes maps the ones ophthalmology teams see most.

How claims management software keeps 65820 claims moving

Most practices run this workflow across two screens. The surgeon’s note lives in one system and the claim form in another, so someone retypes the code, the eye, and the diagnosis in between. Every retype is a chance to send a right-eye modifier with a left-eye diagnosis.

Practice management software like Pabau connects operative documentation to claims submission. The CPT code attached to the service lands on the charge line by itself.

The ICD-10 slots are seeded from the client’s recorded problem list. Built-in ICD-10-CM and CPT lookup libraries sit behind a search icon, so a coder can confirm H40.1112 without leaving the claim.

Pabau’s claims software for billers also checks that the claim’s required fields are complete before the send button unlocks. It then submits through the clearinghouse your region uses.

On US claims that adds real-time eligibility checks, claim status tracking, and remittance advice posted back against the original charge.

Send goniotomy claims without retyping the note

Pabau connects operative documentation to claims submission, so the CPT and ICD-10 codes already on the record reach the claim form. Ophthalmology billing teams submit through their clearinghouse and track the remittance in one place.

Book a demo

Conclusion

Goniotomy billing rewards precision in two places: the digits and the note. Get the laterality modifier and the H40 stage right, and 65820 is a clean claim worth roughly $723 in 2026. Miss either one and you are appealing a denial that an automated edit caught in seconds.

The bundling rules are the part worth re-reading each quarter. Article A56866 and the NCCI table decide whether a same-session stent or canaloplasty leaves 65820 payable. Those answers change while your internal cheat sheet quietly does not.

Retyping codes between the operative note and the claim form costs your billing team time. Book a demo to see how Pabau carries goniotomy documentation straight through to submission.

Continue your research

Want the wider picture on how surgical claims get paid? Revenue cycle management follows the money from documentation through to posted payment.

Losing too many ophthalmology claims to denials? Denial management in healthcare sets out how to track, categorize, and work denials by code.

Checking coverage before a surgical case? Insurance eligibility verification explains how real-time checks stop post-surgical rejections.

Trying to read what the payer sent back? Electronic remittance advice breaks down the ERA line by line, including the adjustment codes.

New to the surgical billing cycle? What is medical billing covers the fundamentals that every code-level decision rests on.

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