The short version
- Breast reduction is CPT 19318 (reduction mammaplasty). It’s covered as reconstructive only for symptomatic macromastia — never for size or shape alone, no matter how large the breast.
- Coverage needs both halves: two or more documented symptoms — neck, shoulder, and back pain, bra-strap grooving, chronic inframammary rash — and enough tissue removed to clear the payer’s gram threshold. Symptoms without the grams, or grams without the symptoms, generally doesn’t pay.
- Most payers also require a documented conservative-therapy trial that failed first — commonly three to six months of physical therapy and/or chiropractic care, NSAIDs, and proper support. A nutritionist, a personal trainer, or a wellness coach doesn’t count.
- Prior authorization isn’t optional: get the predetermination before scheduling, or the payer may owe nothing even on a qualifying case.
Breast reduction (CPT 19318): covered for symptoms, not size
Breast reduction is 19318, reduction mammaplasty. The same operation is reconstructive when it relieves the documented burden of symptomatic macromastia and cosmetic when it’s about size or shape. The code is identical; the coverage rides on why.
That distinction is the whole game. A reduction done for size alone — no documented symptoms — is cosmetic, and no amount of tissue removed changes that. Generally speaking, the payer isn’t buying smaller breasts; it’s buying relief from a documented physical burden. Get that backwards in the chart and even a large reduction reads cosmetic and denies.
The symptoms that qualify 19318 for coverage
Here’s the lever that actually wins the claim: documented symptoms. Payer policy commonly accepts medical necessity when the chart documents two or more symptoms of macromastia, recorded with exam findings and a history of conservative care that failed.
The qualifying symptoms are specific: persistent neck, shoulder, and back pain; painful grooving from bra straps; chronic intertriginous rash in the inframammary fold; sometimes headache or numbness. Two of those, documented properly, are the medical necessity. Without them the case is cosmetic no matter the cup size — symptoms are the gate, and the chart has to walk through it first.
Breast reduction (19318) and the conservative-therapy trial payers require
Before most payers approve 19318, they want proof the symptoms didn’t resolve on their own: a documented trial of conservative therapy that failed. Generally speaking, that’s three to six months — Aetna anchors at three, Medicare wants six, and the bulk of commercial policies land somewhere in that window. Document four weeks and call it done, and you’ve written the denial yourself.
What counts is the supervised, symptom-directed care: physical therapy and/or chiropractic care, NSAIDs, proper support garments, dermatologic treatment for the inframammary rash. What doesn’t: a nutritionist, your favorite gym rat, a dietitian, a wellness coach. The criteria apply regardless of body weight, so “go lose some weight first” isn’t the trial — diet-and-fitness help isn’t conservative therapy for symptomatic macromastia. Payers want the symptom-directed care on the record, dated, with the outcome.
Build the therapy trial into the chart the day the symptoms first show up, not the week before surgery. A reduction with two documented symptoms, a cleared gram threshold, and a six-month PT-and-chiro record that didn’t help is a clean claim. The same reduction with a blank therapy history is a denial waiting to be appealed.
How the Schnur scale screens a symptomatic case
With the symptoms and the failed therapy on the record, most payers apply one more test: the Schnur scale. It ties the minimum tissue to be removed to the patient’s body surface area, and coverage anchors around roughly the 22nd percentile of that scale. A larger patient has to have more grams removed per breast to clear it; a smaller patient, less.
This is the ‘size’ half of the claim, and it’s a real requirement — not a formality you can wave off. Clearing the gram math on an asymptomatic patient is still cosmetic; that part never changes. But symptoms don’t excuse you from the number either: generally speaking, both have to clear. A very large removal can carry a borderline body-surface-area figure when the symptoms are airtight, but plan to meet the threshold, not argue around it. Grams and symptoms ride together — neither one alone gets you paid.
Estimate the Schnur threshold before you build the case
Run the patient’s body surface area and estimated grams through our breast reduction calculator to see where the gram threshold lands.
Documenting medical necessity for breast reduction
The 19318 that clears carries a surgeon’s letter: the documented symptoms, the physical findings, the estimated grams to be removed per breast, photographs, and the dated conservative-therapy trial that failed. The predetermination has to go in before surgery, because an unauthorized reconstructive claim can leave the payer off the hook entirely.
Build it as a packet, not a checkbox. Lead with the symptoms, attach the gram estimate and photos, and request the predetermination in writing. If the denials are stacking up on legitimately symptomatic reductions, our medical billing operation works the necessity documentation and the appeals behind it.
Frequently asked questions
Is breast reduction covered by insurance?
Yes, when it’s reconstructive — relieving symptomatic macromastia rather than changing size or shape. Breast reduction (CPT 19318) is covered when the chart documents qualifying symptoms (generally two or more), a failed trial of conservative therapy, and enough tissue removed to clear the payer’s gram threshold, all with prior authorization. Reduction for appearance alone is cosmetic and is the patient’s responsibility.
What is the Schnur scale for breast reduction?
The Schnur scale ties the minimum grams of tissue to be removed to the patient’s body surface area, and payers generally anchor medical necessity near the 22nd percentile of that scale. It’s a required part of the case alongside documented symptoms — both have to clear. Meeting the gram threshold without symptoms is still cosmetic.
Can you get breast reduction covered without meeting the Schnur scale?
Usually no. Both documented symptoms and enough tissue removed are generally required, so a case that falls short of the gram threshold is hard to clear on symptoms alone. A very large removal can sometimes carry a borderline body-surface-area figure when symptoms are well documented, but size alone never qualifies and symptoms alone rarely overcome a low gram count.
What conservative treatment is required before a breast reduction?
Most payers require a documented trial of conservative therapy that failed before approving 19318 — commonly three to six months. Qualifying measures are symptom-directed: physical therapy and/or chiropractic care, NSAIDs, proper support garments, and dermatologic treatment of any inframammary rash. Weight-loss or fitness help from a nutritionist, personal trainer, or wellness coach does not satisfy it, and the symptom criteria apply regardless of body weight.
Why was my breast reduction claim denied?
Common reasons are missing prior authorization, no documented conservative-therapy trial, a record that documents size rather than symptoms, or falling short of the payer’s gram threshold. Because 19318 is reconstructive only when symptomatic and conservatively managed first, an unauthorized or thinly documented case denies by default.
Does breast reduction require prior authorization?
In nearly all cases, yes. Submit a predetermination with the surgeon’s letter, symptoms, exam findings, estimated grams, and photos before scheduling — if surgery proceeds without authorization, the insurer may not be obligated to pay even on an otherwise qualifying case.
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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 Society of Plastic Surgeons (ASPS), Medicare (CMS), and AMA CPT. When in doubt, don’t bill it.
