SADI-S — single-anastomosis duodeno-ileal bypass with sleeve gastrectomy — is the newest mainstream operation in bariatric surgery, and in my practice it has become one of the most requested. The reason is simple: it delivers weight loss approaching the powerful duodenal switch (70 to 80 percent of excess weight) with a simpler construction — one intestinal connection instead of two — and a lighter lifelong nutritional burden. It’s also one of the most effective revision options for patients whose gastric sleeve stalled. The American Society for Metabolic and Bariatric Surgery (ASMBS) formally endorsed SADI-S in 2020, moving it from “investigational” to an accepted standard. This page explains how it works, who it fits, how it compares to the sleeve, bypass, and classic DS, and what it costs in Los Angeles in 2026.
| SADI-S at a Glance | Details |
|---|---|
| Full name | Single-Anastomosis Duodeno-Ileal bypass with Sleeve gastrectomy |
| Average excess weight loss | 70–80% |
| Type 2 diabetes remission | ~80–85% |
| Key advantage | Near-DS power with ONE intestinal connection — simpler, shorter, gentler |
| Best for | BMI 45+, strong diabetes, or sleeve patients needing revision |
| Approach | Laparoscopic or robotic; 1–2 night stay |
| Operative time | 2–3 hours |
| 2026 Los Angeles self-pay cost | $19,000–$28,000 all-inclusive |
How SADI-S Works
SADI-S is built from two components performed in one operation:
- The sleeve — the stomach is converted to a vertical sleeve, identical to a standalone gastric sleeve. Meal capacity drops and ghrelin-driven hunger falls with it.
- The single-loop bypass — just past the stomach outlet, the duodenum is divided and connected directly to a loop of ileum (the last portion of the small intestine). Food now skips a substantial stretch of absorptive intestine — but through one surgical connection, where the classic duodenal switch requires two.
That single-anastomosis design is the entire point. One fewer connection means a shorter operation, one fewer site that could ever leak or narrow, and a reconstruction that preserves the pylorus — the stomach’s natural outlet valve — which is why dumping syndrome, a known nuisance after standard gastric bypass, is rare after SADI-S.
Who Is a Good Candidate for SADI-S?
- Patients with BMI 45–60 who want more power than a sleeve alone reliably delivers but hesitate at the classic DS’s demands
- Patients with significant type 2 diabetes — the metabolic effect approaches the DS’s, with remission rates around 80–85 percent
- Sleeve patients with inadequate loss or regain — because SADI-S starts with a sleeve, converting an existing sleeve is a natural single-stage revision; this is one of the fastest-growing uses of the procedure (see bariatric revision surgery)
- Patients committed to daily supplements and annual labs — lighter than the DS’s regimen, but still lifelong
Poorly controlled GERD deserves special mention: like the sleeve it’s built on, SADI-S can worsen reflux. Patients with significant reflux are usually better served by gastric bypass, and I’ll say so plainly at consultation.
SADI-S vs Duodenal Switch vs Bypass vs Sleeve
| Factor | SADI-S | Duodenal Switch | Gastric Bypass | Gastric Sleeve |
|---|---|---|---|---|
| Excess weight loss | 70–80% | 75–85% | 70–80% | 60–70% |
| Diabetes remission | ~80–85% | ~90% | ~80% | ~60% |
| Intestinal connections | 1 | 2 | 2 | 0 |
| Dumping syndrome | Rare (pylorus preserved) | Rare | Common | Rare |
| Supplement burden | Moderate | Highest | Moderate | Lowest |
| Sleeve-revision pathway | Excellent | Excellent | Good | — |
Against the classic duodenal switch, SADI-S trades a few percentage points of maximum weight loss for a simpler, safer construction and an easier life afterward. For BMI above 60 or the most severe metabolic disease, the classic DS still earns its place. For the large middle group, SADI-S is the modern answer — which is exactly how the field has been using it since ASMBS endorsement.
SADI-S as Sleeve Revision — The Fast-Growing Use Case
Roughly one in four bariatric operations nationally is now a revision, and stalled sleeves are the most common reason. The sleeve is an excellent operation, but 25 to 30 percent of sleeve patients experience inadequate loss or significant regain by year five. Converting a sleeve to SADI-S adds the malabsorptive component without touching the existing sleeve (assuming it’s anatomically sound on endoscopy) — a single-stage revision that typically restarts loss of 60 to 70 percent of the remaining excess weight.
If your sleeve stopped working, the honest first step is diagnosis, not surgery: we evaluate the sleeve’s anatomy, your metabolic picture, and your eating pattern before recommending conversion to SADI-S, classic DS, or bypass — or, for some patients, adding GLP-1 medication instead of revising at all.
SADI-S Cost in Los Angeles (2026)
Self-pay SADI-S at accredited Los Angeles facilities runs $19,000 to $28,000 all-inclusive in 2026 — surgeon, anesthesia, facility, hospital stay, and follow-up program. Sleeve-to-SADI conversions price similarly, occasionally higher when scar tissue from the first operation adds complexity.
Insurance coverage has improved markedly since ASMBS endorsement — most major carriers now cover SADI-S under their standard bariatric criteria (BMI 40+, or 35+ with comorbidities), and revision coverage exists where medical necessity is documented. Our team handles authorization; see insurance options, financing, and the full bariatric surgery cost guide.
Frequently Asked Questions About SADI-S
Is SADI-S experimental?
No — not anymore. The ASMBS formally endorsed SADI-S as an accepted bariatric procedure in 2020 after a decade of accumulating outcome data, and most major insurers now cover it under standard bariatric criteria. It is newer than the sleeve and bypass, which means 20-year data doesn’t exist yet, but 10-year international data shows durable weight loss and an excellent safety profile. What matters more than the calendar is your surgeon’s experience with duodenal dissection — ask any surgeon you consult how many SADI-S procedures they perform.
How is SADI-S different from a mini gastric bypass?
Both are single-anastomosis operations, but they’re built differently. The mini gastric bypass creates a long narrow stomach pouch and connects it to the jejunum, bypassing the pylorus — so bile reflux and dumping are possible. SADI-S keeps the full sleeve anatomy and the pylorus, connecting the duodenum to the ileum instead. Practical differences: SADI-S generally produces somewhat greater weight loss and less dumping; the mini bypass is a shorter, simpler operation. Which fits you depends on BMI, reflux history, and metabolic goals.
What supplements does SADI-S require long-term?
A daily bariatric multivitamin, vitamin D with calcium citrate, iron for menstruating women, and B12 — checked with annual labs and adjusted as needed. The burden sits between the sleeve’s (lightest) and the classic DS’s (heaviest): the single-loop design bypasses less intestine than the DS, so fat-soluble vitamin deficiencies are meaningfully less common. Lighter does not mean optional — annual labs for life are part of the deal, and we build them into your follow-up program.
How much weight will I lose with SADI-S?
Published series and our practice experience both land at 70 to 80 percent of excess body weight by 12 to 18 months. A patient starting at 320 pounds with an ideal weight near 170 would typically lose 105 to 120 pounds. Sleeve-to-SADI revision patients typically lose 60 to 70 percent of whatever excess remained at conversion. As with every bariatric operation, the medication-free durability of the result tracks with protein intake, follow-up attendance, and activity — surgery is the tool, not the whole answer.
What are the risks specific to SADI-S?
Beyond standard surgical risks (leak, bleeding, clot — each in the low single digits or below at experienced centers), SADI-S carries the malabsorption-specific ones: vitamin and protein deficiency if supplementation lapses, looser stools especially after fatty meals, and a reflux profile similar to the sleeve’s. Compared to the classic DS, the single anastomosis removes one potential leak site and reduces internal hernia risk. Compared to doing nothing, the risk calculus overwhelmingly favors surgery for qualifying patients — untreated severe obesity is the higher-risk path.
How long is recovery after SADI-S?
One to two nights in the facility, walking the evening of surgery. Most patients return to desk work in 10 to 14 days and full activity at 4 to 6 weeks. The staged diet — liquids to purées to soft food to regular texture — runs about 6 weeks, the same protocol as our sleeve patients follow. The pylorus-preserving design tends to make early eating more comfortable than bypass patients report, with less risk of the post-meal “dumping” crash.
Why Choose Healthy Life Bariatrics for SADI-S
SADI-S rewards surgical experience — duodenal dissection is the technically demanding step, and outcomes track with volume. I perform every consultation and every operation personally at accredited Los Angeles facilities, following ASMBS guidelines with a structured lifelong follow-up program: scheduled labs, supplement management, and dietitian support. Whether SADI-S is your first operation or the revision that finally finishes what a sleeve started, the evaluation starts with your anatomy and goals — including an honest look at whether the classic duodenal switch, bypass, or medication belongs in the conversation instead.
Schedule a consultation: healthylifebariatrics.com/contact · (310) 455-8020
Last updated 2026-07-06. Medically reviewed by Dr. Babak Moeinolmolki, MD, dual board-certified in bariatric and cosmetic surgery.
