The short version
- Ptosis repair corrects a drooping upper-lid margin: 67901 is the frontalis sling technique, 67904 is external tarso-levator resection or advancement.
- It’s a different problem from blepharoplasty — 67904 fixes the lid margin, 15823 removes excess skin (dermatochalasis). They can coexist but are coded and justified separately.
- The lever is the margin-reflex distance: payers consider repair medically necessary when the MRD is 2mm or less in primary or downgaze, with documented visual obstruction.
- Hering’s law matters: a lid that looks fine can become ptotic to 2mm or less once the more-ptotic lid is elevated — document it, and a clean cosmetic case isn’t covered (append modifier GA with an ABN on file).
- When a patient has both, you don’t bill both to insurance — NCCI bundles them. Bill the one that’s genuinely functional and pays more (67904 ptosis, ~$508 facility vs ~$482 for 15823) and do the other as elective cash.
Ptosis repair (67904) vs blepharoplasty (15823)
Ptosis repair and blepharoplasty look similar across the room and code completely differently. Ptosis repair fixes a lid margin that sits too low: 67901 is the frontalis sling, 67904 is external tarso-levator resection or advancement. Blepharoplasty (15823) removes excess skin, dermatochalasis. Different tissue, different measurement, different code.
They can coexist on the same eye, and when they do they’re billed and justified separately, each on its own finding. Code a margin problem as a skin problem, or vice versa, and the documentation won’t match the code. We cover the skin side in our functional blepharoplasty guide; this is the margin. And a third layer hides here: a sagging brow can press the lid down and mimic ptosis, so rule out brow ptosis before resecting a levator — if lifting the brow restores the lid position, the problem, and the code, is the brow.
MRD ≤2mm: the medical-necessity threshold
The whole claim turns on one measurement: the margin-reflex distance. Payer policy treats ptosis repair as medically necessary when the MRD is 2mm or less in primary gaze or downgaze, paired with the patient’s documented complaint of visual interference and visual-field obstruction.
So the exam, not the appearance, carries the case. A lid that looks heavy with an MRD of 3mm is a cosmetic claim; a lid measured at 2mm or less with a matching field defect is medical necessity. Record the MRD to the millimeter and the field defect alongside it, and the claim has its spine. Leave the MRD out and even a genuinely ptotic lid reads cosmetic.
When both qualify: one goes to insurance, one is cash
Plenty of patients have both: a low lid margin and redundant skin. Both can be functional, but billing both to insurance on the same lid is a fight you usually lose. NCCI bundles blepharoplasty (15823) with the ptosis codes, so the pair draws edit scrutiny and the second procedure takes the multiple-procedure reduction. Splitting them across two dates to dodge the edit is worse — that’s the kind of unbundling that invites a takeback.
So the clean move, when the chart honestly supports it, is one procedure through insurance and one as cash. Medical necessity decides first: the procedure that clearly meets criteria — MRD ≤2mm with a field defect for ptosis, true visual obstruction from the skin for blepharoplasty — is the one you bill. When both could stand on their own, the fee schedule breaks the tie, and it points the same way in every setting: ptosis (67904) pays more.
Ptosis wins in both settings — a higher work RVU (7.77 vs 6.64) and the higher allowable whether it’s done in the office or the ASC. So the default, when it’s honest to the chart, is 67904 to insurance as the functional repair, 15823 as the elective cosmetic the patient pays for. Figures are 2026 Medicare national averages; commercial contracts vary, often at a multiple of Medicare, so check your own payer agreements and locality GPCI before you rely on a number.
The one rule that can’t bend: the procedure you bill to insurance has to be the one that is actually medically necessary and documented as such. You never relabel a covered repair as cosmetic, or a cosmetic one as covered, to chase the higher line. Necessity picks the lane; the fee schedule only breaks a genuine tie.
When one lid hides the other (Hering’s law)
Here’s the nuance that costs second-eye coverage. Under Hering’s law, a lid that measures fine pre-op can drop to an MRD of 2mm or less once the more-ptotic lid is elevated. The brain was over-driving both; correct the worse side and the other reveals its true position.
Payers recognize this, but only if you document it. A lid that initially fails the threshold can still qualify when the masked ptosis is shown, often with the more-ptotic lid manually elevated on exam or photos. Note the Hering’s effect explicitly, and the second eye holds; ignore it and the second repair denies as cosmetic even when it isn’t.
Documenting ptosis for coverage (MRD, fields, photos)
The 67904 that clears carries four things: the MRD measurement at 2mm or less, the visual-field study showing obstruction, the functional symptoms, and external photographs. When redundant skin coexists with true lid ptosis, add photos taken with the upper-lid skin retracted, so the payer sees the actual lid-margin position and not just the skin shadowing it.
Build it before surgery and request the prior authorization; a cosmetic ptosis case gets modifier GA with an ABN on file, not a clean claim. The documentation checklist and payer policy links for 67904 are a free search in the Medical Necessity tool on Billing IQ. If legitimately functional ptosis repairs are denying, our medical billing operation works the MRD-and-fields documentation and the appeals behind it.
Frequently asked questions
Is ptosis repair covered by insurance?
When it’s functional, yes. Ptosis repair (CPT 67901 or 67904) is covered when the margin-reflex distance (MRD) is 2mm or less in primary or downgaze with documented visual-field obstruction. Repair done purely to improve a tired or aged appearance, with a normal lid position, is cosmetic and the patient’s responsibility.
What’s the difference between ptosis repair and blepharoplasty?
Ptosis repair (67901 sling / 67904 levator resection) corrects a drooping upper-lid margin, measured by MRD. Blepharoplasty (15823) removes excess upper-eyelid skin (dermatochalasis). They are different problems with different measurements and codes, and can be billed together when each is documented.
Can you bill blepharoplasty and ptosis repair together?
NCCI bundles blepharoplasty (15823) with the ptosis codes, so billing both to insurance on the same lid draws edit scrutiny and a multiple-procedure reduction, and splitting them across dates invites a takeback. When both are present, the common approach is to bill the genuinely functional, higher-paying procedure to insurance and do the other as elective cash. In national 2026 Medicare terms, ptosis repair (67904) pays more than blepharoplasty (15823) in both settings, roughly $508 versus $482 in a facility. The procedure billed to insurance must be the one that is actually medically necessary and documented.
What MRD qualifies ptosis repair for coverage?
Payers generally consider ptosis repair medically necessary when the margin-reflex distance (MRD) is 2mm or less in primary gaze or downgaze, together with documented visual interference and visual-field obstruction. The MRD measurement, recorded in the exam, is the central coverage criterion.
Why was my ptosis repair claim denied?
Common reasons are a missing or insufficient MRD measurement, no visual-field documentation of obstruction, coding a skin (dermatochalasis) problem as ptosis, or a second-eye repair denied because the Hering’s-law masked ptosis wasn’t documented. The MRD and field study are the usual failure points.
What is Hering’s law in ptosis surgery billing?
Hering’s law describes how a lid that measures within normal limits can become ptotic — MRD 2mm or less — once the more-ptotic lid is elevated. Documenting this masked ptosis (often with the worse lid manually raised on exam or photos) supports coverage of the second eyelid that otherwise appears not to meet criteria.
This article explains how these codes tend to get paid — it is not coding, billing, or legal advice. Some of the codes here are bundled into the main procedure, or fall into grey areas that vary by payer. Before billing anything in a grey area, confirm it with your own coding and compliance team and the current guidance from the American Academy of Ophthalmology (AAO), Medicare (CMS), and AMA CPT. When in doubt, don’t bill it.
