Bariatric surgery billing hinges on prior authorization: BMI documentation, comorbidity evidence, supervised weight-loss history, psych and nutrition evals, every criterion on the payer checklist must be in the record before 43775, 43644, or 43770 ever bills. General billers send incomplete packets and watch claims die. MedFactor delivers bariatric-specific RCM that authorizes, bills, and collects on every case.
From sleeve gastrectomy and Roux-en-Y bypass to revisional bariatric surgery, we tailor billing to the authorization and coding rules of every bariatric subspecialty.
Laparoscopic sleeve (43775) with prior-auth criteria, BMI documentation, and comorbidity evidence.
Laparoscopic RYGB (43644) with multivessel comorbidity documentation and post-op bundle coding.
Laparoscopic adjustable gastric banding (43770) with adjustment and management coding.
Complex bypass with duodenal switch (43645) and increased-service modifier documentation.
Band-to-sleeve, sleeve-to-bypass revisions with unlisted (43999) and increased-service coding.
Pre-op supervised weight loss, E/M visits, and program documentation for authorization.
Every bariatric case lives or dies on prior authorization. Payers require a documented checklist of medical-necessity criteria before approving a sleeve, bypass, or band, and one missing item means the whole authorization fails. MedFactor verifies every criterion before the claim is ever submitted.
Most bariatric denials aren’t coding errors, they’re authorization gaps. Incomplete packets cost the case before surgery is even scheduled.
E66.01 / Z68.4x–5x documented with measured height and weight.
Type 2 diabetes (E11), hypertension (I10), dyslipidemia (E78), GERD (K21), sleep apnea.
Physician-supervised diet documented across consecutive monthly visits.
Behavioral health clearance confirming readiness and adherence capacity.
Registered dietitian assessment and post-op dietary plan on file.
Documented history of unsuccessful medically supervised attempts.
Bariatric billing is governed by prior-authorization criteria, BMI documentation, and bundle rules that general billing companies cannot navigate effectively.
Missing psych eval, supervised diet, or comorbidity documentation fails the case before surgery.
E66.01 without the Z68.4x/5x BMI code, or the BMI code missing entirely, weakens medical necessity.
Revisional and atypical bariatric cases defaulted to unlisted 43999 without comparison-code justification.
Post-op visits and adjustments in the bariatric global billed without the correct modifier or timing.
DM2, HTN, sleep apnea, and GERD that strengthen medical necessity not documented or sequenced.
Band-to-sleeve and sleeve-to-bypass revisions coded without increased-service modifier 22 justification.
Quick reference for the most frequently used codes in bariatric surgery billing and coding.
| Code | Description | Common Use |
|---|---|---|
| 43775 | Laparoscopic sleeve gastrectomy | Vertical sleeve resection |
| 43644 | Laparoscopic RY gastric bypass | Roux-en-Y bypass |
| 43645 | Lap RYGB w/ duodenal switch | BPD / DS procedure |
| 43770 | Laparoscopic adjustable gastric banding | LAGB placement |
| 43999 | Unlisted bariatric procedure | Revisional / atypical case |
| 43771 | Lap gastric band adjustment (radiologic) | Band fill / adjustment |
| 43848 | Open revisional bariatric procedure | Open revision |
| 43886 | Gastric band adjustment (non-radiologic) | Clinic band adjustment |
| Code | Description | Clinical Context |
|---|---|---|
| E66.01 | Morbid (severe) obesity | Primary bariatric diagnosis |
| Z68.4x | BMI 40.0–44.9 adult | BMI documentation |
| Z68.5x | BMI 50.0+ adult | Class III obesity |
| E11.x | Type 2 diabetes mellitus | Comorbidity / medical necessity |
| I10 | Essential hypertension | Comorbidity |
| E78.x | Dyslipidemia | Comorbidity |
| K21.x | Gastroesophageal reflux (GERD) | Comorbidity |
| G47.3x | Sleep apnea | Comorbidity |
| Modifier | Description | Bariatric Application |
|---|---|---|
| 51 | Multiple procedures | Multiple bariatric / ancillary procedures same session |
| 59 | Distinct procedural service | Distinct concurrent procedures at same session |
| 22 | Increased procedural service | Complex revisional / increased-work bypass |
| 25 | Separate E/M same day | Pre-op E/M with same-day procedure |
| 80 / 82 | Assistant surgeon | Assistant for complex bypass / revision |
| 24 | Unrelated E/M in post-op | Unrelated post-op visit in global |
| 78 | Unplanned return to OR in post-op | Complication return in bariatric global |
Comprehensive revenue cycle management designed specifically for bariatric surgery practices.
Specialty coders map sleeve, bypass, band, and revision codes with complete criteria documentation.
Prior-auth defense, criteria documentation, and appeals with complete medical-necessity packets.
Complete criteria packets. BMI, comorbidities, supervised diet, psych and nutrition evals, verified before submission.
Prioritized follow-up on aged bariatric, revisional, and adjustment claims with strategic payer escalation.
Regular audits focused on auth criteria, BMI diagnosis sequencing, bundle rules, and modifier accuracy.
Real-time dashboards tracking auth approval rate, procedure mix, and per-case profitability.
Understanding the most common denial reasons is the first step to preventing them on sleeve, bypass, and band claims.
Missing psych eval, supervised diet, or comorbidity documentation in the auth packet.
We assemble and verify the complete payer criteria checklist before submission.
E66.01 without the Z68.4x/5x BMI code, weakening the medical-necessity picture.
We sequence E66.01 with the matching Z68 BMI code on every bariatric claim.
Revisional and atypical cases defaulted to 43999 without comparison-code justification.
We document the comparison code and work justification to support 43999 reimbursement.
Post-op visits and adjustments in the bariatric global billed without correct modifier or timing.
Global-period tracking applies modifier 24/78 for unrelated or return procedures.
DM2, HTN, sleep apnea, and GERD that strengthen medical necessity not documented.
We capture and sequence every relevant comorbidity to maximize medical necessity.
Band-to-sleeve and sleeve-to-bypass revisions coded without modifier 22 justification.
Modifier 22 applied with documented increased-work justification on complex revisions.
Identifying and plugging these common revenue leakage points can significantly improve your practice’s bottom line.
Missing criteria documentation fails the case before surgery is scheduled.
E66.01 without the Z68 BMI code weakens medical necessity.
Revisional cases defaulted to unlisted without comparison-code justification.
DM2, HTN, sleep apnea, GERD not documented to strengthen medical necessity.
See how bariatric-specific revenue cycle management transforms your practice’s financial performance.
A structured onboarding process designed to deliver measurable improvements within the first 90 days.
Review of bariatric billing operations, prior-auth workflow, and revenue cycle baseline.
Review of bariatric billing operations, prior-auth workflow, and revenue cycle baseline.
EMR integration, dedicated bariatric billing team, and criteria-checklist templates deployed.
EMR integration, dedicated bariatric billing team, and criteria-checklist templates deployed.
Full billing with verified auth packets, criteria tracking, and denial prevention.
Full billing with verified auth packets, criteria tracking, and denial prevention.
Performance review against baseline, workflow optimization, and documented revenue improvement.
Performance review against baseline, workflow optimization, and documented revenue improvement.
How our bariatric-specific approach compares to in-house billing and general medical billing companies.
| Capability | In-House Team | General Billing Co. | MedFactor Bariatric |
|---|---|---|---|
| Prior-auth criteria checklist verification | Inconsistent | ✕ | ✓ |
| BMI diagnosis sequencing (E66.01 + Z68.4x/5x) | ✕ | ✕ | ✓ |
| Comorbidity capture for medical necessity | Manual | Partial | ✓ |
| Revisional / 43999 comparison-code justification | ✕ | ✕ | ✓ |
| Modifier 22 increased-work documentation | Inconsistent | ✕ | ✓ |
| Assistant surgeon modifier 80/82 | Inconsistent | ✕ | ✓ |
| Global-period adjustment & visit tracking | Manual | Partial | ✓ |
| Auth approval rate analytics | ✕ | ✕ | ✓ |
| Dedicated bariatric surgery billing team | ✕ | ✕ | ✓ |
Our team combines deep bariatric surgery billing expertise with the technology and processes to deliver consistent, measurable results for sleeve, bypass, and band practices.
Discover exactly where your bariatric practice is losing revenue. Our no-obligation audit analyzes your prior-auth criteria, BMI documentation, and bundle coding.
Real results from bariatric surgery practices that partnered with MedFactor for specialty revenue cycle management.
A sleeve gastrectomy program was losing cases to incomplete prior-auth packets missing psych and nutrition evals. MedFactor deployed a criteria-checklist verification process, lifting auth approval and recovering substantial program revenue in eight months.
A revisional bariatric practice was defaulting complex revisions to unlisted 43999 without comparison-code justification, triggering underpayment. MedFactor documented comparison codes and modifier 22, recovering revisional revenue.
A Roux-en-Y and lap-band practice was under-documenting comorbidities that strengthen medical necessity. MedFactor implemented comorbidity capture and BMI sequencing, recovering under-billed revenue.
No matter where your bariatric practice operates, our team understands the payer landscape and regulatory requirements in your region.
Prior-auth criteria, BMI documentation, and bundle rules handled correctly across every payer and every state.
Common questions from bariatric practices considering MedFactor’s specialty RCM services.
Most payers require a documented checklist of medical-necessity criteria before approving bariatric surgery: a BMI of 40 or higher (or 35 or higher with a qualifying comorbidity), documented comorbidities such as type 2 diabetes, hypertension, dyslipidemia, GERD, or sleep apnea, a physician-supervised weight-loss program over roughly six consecutive months, a psychological evaluation, a nutritional evaluation, and a history of failed non-surgical weight-loss attempts. Each criterion must be documented in the record before the authorization is submitted. We assemble and verify the complete payer criteria packet before submission, because a bariatric case authorized with a missing psych eval, an undocumented supervised diet, or an unverified comorbidity is denied, and a denial here means no surgery, no claim, and no revenue.
The primary bariatric diagnosis is morbid (severe) obesity, E66.01, and it must be paired with the matching adult BMI code from the Z68 series. Z68.4x for a BMI of 40.0 to 44.9 and Z68.5x for a BMI of 50.0 or higher. The BMI code documents the measured severity that drives eligibility, so sequencing E66.01 without the Z68 BMI code, or omitting the BMI code entirely, weakens the medical-necessity picture and invites denial. We sequence E66.01 with the matching Z68.4x or Z68.5x BMI code on every bariatric claim so the measured BMI is on the record and the medical-necessity picture is complete.
Revisional bariatric procedures: band-to-sleeve conversions, sleeve-to-bypass revisions, and other reoperations, are often reported with the appropriate revisional CPT code, or with unlisted procedure 43999 when no specific code describes the work. When 43999 is used, the claim must include a comparison code and documented work justification so the payer can value the procedure; without that justification the claim is underpaid or denied. Complex revisions that involve increased work over the base procedure may warrant modifier 22 (increased procedural service) with supporting documentation. We document the comparison code and the increased-work justification so revisional cases are paid for the work actually performed rather than defaulted to an underpaid unlisted value.
Comorbidities are the medical-necessity engine for bariatric surgery. Type 2 diabetes (E11), essential hypertension (I10), dyslipidemia (E78), GERD (K21), and sleep apnea (G47.3) each document a weight-related condition that surgery is intended to resolve or improve, and a patient with a BMI between 35 and 40 generally needs at least one documented comorbidity to qualify. These comorbidities must be captured from the record and sequenced on the claim alongside E66.01 and the Z68 BMI code so the payer sees the full medical-necessity picture. We capture and sequence every relevant comorbidity on every bariatric claim, because comorbidities left undocumented weaken the authorization and the claim even when the surgery itself was clearly indicated.
Modifier 22 (increased procedural service) is appended when the work of a bariatric procedure is substantially greater than usual, for example, a complex revisional bypass with extensive adhesiolysis, a reoperative sleeve with significant scarring, or a duodenal switch performed in a reoperated abdomen. Modifier 22 requires documentation in the operative note that explains why the work was increased, and the claim should reference the increased complexity so the payer can adjust reimbursement. We apply modifier 22 with documented increased-work justification on complex revisions, because a high-work revision billed at the base procedure value, without modifier 22 and its justification, reimburses the same as a straightforward primary case and silently loses the additional RVUs the work warrants.
MedFactor applies the same code-level precision across the full practice spectrum. See how we bill these related specialties.
CPT®, ICD-10, HCPCS, and modifier codes referenced on this page reflect the current code sets and are subject to annual updates — always verify against the current-year fee schedule before submission. KPIs and case-study figures shown are representative benchmarks, not guarantees of individual practice results.
Your bariatric practice deserves billing partners who know the prior-auth checklist, BMI documentation, and bundle rules, and verify every criterion before a claim is submitted. Let MedFactor show you what specialty RCM can do.