If you’re considering breast reduction surgery and have Blue Cross Blue Shield (BCBS) insurance, you’ve probably discovered that getting coverage isn’t as simple as calling your doctor and scheduling the procedure.
To understand whether your surgery qualifies as medically necessary, and how much tissue needs to be removed, you need to first understand your body surface area (BSA), the Schnur Scale, and how BCBS uses these measurements.
In addition to these factors, this guide also breaks down exactly what BCBS looks for when evaluating breast reduction coverage. We’ve also included a Blue Cross Blue Shield breast reduction calculator to let you calculate tissue removal based on your own body surface area.
Step 1: Calculate Your Body Surface Area
Your body surface area (BSA) is a measurement of your total outer body surface, expressed in square meters. Think of it as a way to account for your overall body size, not just your height or weight alone.
Insurance companies often use BSA because breast size that might be excessive for someone who is 5’2″ could be proportionate for someone who is 5’10”. The BSA measurement helps create a fair standard across different body types.
How to Calculate Your BSA
The calculation uses the Mosteller formula:
BSA (m²) = √(height in cm × weight in kg) ÷ 3,600
Don’t worry, you don’t need to do the math yourself. Our Blue Cross Blue Shield breast reduction calculator below does this automatically when you enter your height and weight.
Step 2: Understand the Schnur Scale
The Schnur Sliding Scale is a chart developed in 1991 that correlates your BSA with the minimum amount of breast tissue that should be removed per breast to qualify as medically necessary.
The scale was created when plastic surgeons surveyed their past breast reduction cases and classified them as either cosmetic or medically necessary. They found that when tissue removal fell at or above the 22nd percentile for a person’s BSA, the surgery was typically performed for medical reasons rather than purely cosmetic ones.
Here’s a table showing several different BSAs and corresponding tissue removal amounts (based on the 22nd percentile of the Schnur Scale) for a breast reduction to be considered medically necessary.
| Minimum Tissue Removal Based on BSA | |
|---|---|
| Body Surface Area (m²) | Minimum Tissue to Remove (grams per breast) |
| 1.35 | 199 |
| 1.55 | 284 |
| 1.75 | 404 |
| 1.95 | 575 |
| 2.15 | 819 |
| 2.35 | 1,167 |
For example, if your BSA is 1.75 m², the Schnur Scale suggests at least 404 grams should be removed from each breast for the surgery to meet the 22nd percentile threshold and be considered medically necessary.
Blue Cross Blue Shield Breast Reduction Calculator
Now that you understand the basics, here’s a calculator you can use to estimate the amount of breast tissue removal for your procedure to be considered medically necessary. Just enter your height and weight below to calculate your BSA and estimated tissue removal requirements (based on the Schnur Scale) for your reduction to be considered medically necessary:
Breast Reduction Calculator Using the Schnur Scale
Minimum Tissue to Remove (grams per breast)
Body Surface Area (BSA)
Body Surface Area (BSA)
Tissue Grams Required for Removal
It’s important to note that the Schnur Scale is used differently based on your state and specific insurance policy. Most BCBS plans follow one of two approaches:
- Using the Schnur Scale 22nd percentile based on your BSA
- Requiring a flat minimum (commonly 500 grams per breast, though some states use 350 grams)
Your plastic surgeon will assess whether they expect to remove tissue meeting or exceeding this threshold during your procedure. Keep in mind that surgeons can only estimate the amount before surgery, as the exact weight is measured after the tissue is removed.
A breast reduction may still be considered medically necessary and be covered by insurance if there are intraoperative reasons, such as a concern for compromise of blood flow to the nipple/areola, that the surgeon considers in removing less tissue.
Other BCBS Eligibility Requirements for Breast Reduction
The amount of tissue removed is important, but it’s not the only factor that determines whether a breast reduction is medically necessary. While specific requirements vary by state and plan, most BCBS policies share these common criteria for medical necessity:
Standard Medical Necessity Criteria
Most BCBS plans require documentation of at least one or more of the following conditions:
Physical symptoms lasting 6+ months:
- Chronic neck pain related to breast weight
- Persistent shoulder pain or bra strap grooving
- Upper or lower back pain directly linked to large breasts
- Skin irritation or rashes under the breasts that haven’t responded to treatment
- Headaches attributed to breast weight
- Numbness or tingling in the arms
Failed conservative treatment:
Before approving surgery, BCBS typically wants proof that you’ve tried non-surgical options for at least 3-6 months, including:
- Professionally fitted supportive bras
- Physical therapy or exercises
- Pain medications (over-the-counter or prescription anti-inflammatories)
- Chiropractic care
- Weight management (if applicable)
Additional requirements may include:
- Pre-operative photographs showing physical findings
- Medical records from your primary care physician documenting symptoms
- Documentation that breast size has been stable for at least one year (especially important for patients under 21)
- For women over 40 or 50: recent mammogram results
What If Your Calculation Falls Short?
If the calculator shows you’re close to but slightly under the minimum threshold, don’t give up. Other factors strengthen your case:
- Severity and duration of symptoms
- Clear documentation from multiple healthcare providers
- Photographic evidence of physical symptoms like shoulder grooving
- Impact on daily activities and quality of life
- Unresponsiveness to conservative treatments
Some BCBS plans will approve surgery even if tissue removal is below the Schnur Scale threshold when symptoms are particularly severe. Consulting with an experienced plastic surgeon and their dedicated insurance specialists can increase your chances of securing coverage for your procedure.
Working with Harris Plastic Surgery for BCBS Coverage
At Harris Plastic Surgery, we understand that navigating insurance coverage for breast reduction isn’t easy. We’ll help you by filing detailed documentation that meets BCBS medical necessity requirements and providing a comprehensive pre-operative assessment of expected tissue removal.
While our Blue Cross Blue Shield breast reduction calculator is helpful for estimating tissue removal requirements, the best way to increase your chances of BCBS insurance coverage is to schedule a consultation with Dr. Harris. Reach out today and we’ll evaluate your situation and guide you through the insurance approval process from start to finish.
Joanne Parrinello | Practice Manager
Joanne Parrinello is an expert patient care coordinator, with two decades of experience navigating the complex financial side of medically necessary breast reduction and reconstruction surgery. She acts as a guide to patients, helping them understand their options and their expected out-of-pocket expenses. The insurance industry can be complex and filled with jargon that makes you feel like you need a translator. At Harris Plastic Surgery, Joanne is that translator.