Quick Answer
Medicare covers bariatric surgery (including gastric bypass, sleeve gastrectomy, laparoscopic adjustable gastric banding, and duodenal switch) when you meet specific eligibility criteria - including a BMI of 35 or greater, at least one obesity-related health condition, documented participation in a medically supervised weight loss program, and a psychological evaluation. The average cost of bariatric surgery is $25,000–$30,000; Medicare covers most of this for eligible beneficiaries.
Coverage Comparison by Plan Type
| Plan Type | Coverage | Notes |
|---|---|---|
| Original Medicare (Part A) | Covered - inpatient surgery | Inpatient bariatric surgery hospital stay after Part A deductible ($1,632 in 2024) |
| Original Medicare (Part B) | Covered - outpatient surgery | Outpatient bariatric surgery and follow-up visits at 80% after Part B deductible |
| Medicare Part D | Partial - post-surgery drugs | Prescription medications after surgery - copay/coinsurance by tier |
| Medigap (Plan G) | Covered - cost-sharing | Covers Part A deductible + Part B 20% coinsurance; reduces your cost to near $0 |
Understanding Your Coverage Options
Original Medicare (Parts a & B)
Covered - BMI ≥ 35 with obesity-related condition requiredMedicare Part A covers inpatient bariatric surgery - the hospital stay, operating room, anesthesia, and recovery. You pay the Part A deductible ($1,632 in 2024) for each benefit period. If your surgery is performed as an outpatient procedure, Medicare Part B covers 80% of the doctor's services and surgical supplies after the Part B deductible.
Medicare Part B also covers obesity counseling - up to 22 sessions in the first year for beneficiaries with a BMI over 30. This counseling is covered at 100% as a preventive service when provided by a primary care physician in a primary care setting.
Medicare Part D covers prescription medications prescribed after bariatric surgery, such as vitamins, supplements, and any medications needed for post-surgical management. Coverage depends on your specific Part D plan's formulary.
What It Covers
- Gastric bypass (Roux-en-Y) surgery
- Sleeve gastrectomy
- Laparoscopic adjustable gastric banding (lap-band)
- Duodenal switch (biliopancreatic diversion)
- Anesthesia during surgery
- Inpatient hospital stay and recovery
- Obesity counseling (up to 22 sessions/year, 100% covered)
- Follow-up outpatient visits
What It Doesn't Cover
- Bariatric surgery for cosmetic weight loss (not medically necessary)
- Surgery when BMI is below 35
- Surgery without documented obesity-related health condition
- Surgery without prior participation in a supervised weight loss program
Average bariatric surgery cost: $25,000–$30,000. With Medicare: you pay the Part A deductible ($1,632) for inpatient surgery. With Plan G: $0.
Free Obesity Counseling Available
Medicare covers obesity screening and counseling as a preventive service at 100% - no cost to you. This is a valuable benefit even if you do not ultimately qualify for bariatric surgery.
Medicare Advantage
Covered - prior authorization almost always requiredMedicare Advantage plans must cover the same bariatric surgery benefits as Original Medicare for eligible beneficiaries. However, prior authorization is almost always required, and the approval process can be lengthy.
Some Advantage plans may have additional requirements beyond Medicare's standard eligibility criteria - such as longer participation in a supervised weight loss program or additional psychological evaluations.
Network restrictions apply - you must use an in-network bariatric surgeon and hospital. Not all hospitals or bariatric surgery centers may be in-network for your plan.
Cost-sharing varies by plan. Some Advantage plans have lower deductibles but higher coinsurance for surgical procedures.
Start the Prior Authorization Process Early
Prior authorization for bariatric surgery under Medicare Advantage can take weeks. Start the process early and work closely with your surgeon's office to gather all required documentation.
Medigap (Medicare Supplement)
Reduces your bariatric surgery cost to near $0A Medigap Plan G covers the Part A deductible for inpatient bariatric surgery and the 20% Part B coinsurance for outpatient procedures. Given the high cost of bariatric surgery ($25,000–$30,000), Medigap can save you thousands of dollars.
With Plan G, your only out-of-pocket cost for bariatric surgery is the annual Part B deductible ($240 in 2024), after which all Medicare-approved surgical costs are covered at 100%.
Medigap also covers any post-surgical hospital stays, skilled nursing facility care, and follow-up outpatient visits - providing comprehensive protection throughout your recovery.
With Plan G: $240 total out-of-pocket (Part B deductible only). Without Medigap: $1,632 (Part A deductible) + 20% of outpatient costs.
Medicare Bariatric Surgery Eligibility Requirements
| Requirement | Details | Documentation Needed |
|---|---|---|
| BMI | 35 or greater | BMI measurement from physician |
| Obesity-related condition | At least one (diabetes, sleep apnea, hypertension, etc.) | Medical records documenting the condition |
| Duration of obesity | Documented obesity for 5+ years | Medical history records |
| Supervised weight loss program | Documented participation in medically supervised program | Program records and physician letter |
| Psychological evaluation | Must pass psychological exam | Psychologist/psychiatrist evaluation report |
| No underlying medical disease | No medical disease causing obesity | Physician documentation |
✦ When Medicare Won't Cover Bariatric Surgery
BMI below 35
Medicare requires a BMI of 35 or greater for bariatric surgery coverage. If your BMI is between 30 and 35, you may qualify for obesity counseling but not surgical coverage.
No Obesity-Related Health Condition
You must have at least one obesity-related health condition (such as type 2 diabetes, sleep apnea, hypertension, or heart disease) to qualify for Medicare bariatric surgery coverage.
Insufficient Documentation
Medicare requires extensive documentation including 5+ years of obesity history, participation in a supervised weight loss program, and a psychological evaluation. Incomplete documentation is a common reason for denial.
Cosmetic Weight Loss
Medicare does not cover bariatric surgery for cosmetic weight loss. The surgery must be medically necessary to treat obesity-related health conditions.
✦ Frequently Asked Questions
David Haass
AuthorDavid Haass is the Chief Technology Officer and Co-Founder of Elite Insurance Partners and MedicareFAQ.com. He is a member and regular contributor to Forbes Finance Council.
Ashlee Zareczny
ReviewerAshlee Zareczny is a licensed Medicare agent in all 50 states dedicated to educating those eligible for Medicare. She trains agents on CMS compliance guidelines.