NHS Surgery Pathways
NHS Bariatric Surgery Pathways: Referrals, Waiting Lists, Appeals & What to Do If You're Refused
A practical England-focused guide to NHS bariatric surgery: referral criteria, specialist assessment, the operation pathway, waiting-time rights, patient choice, rejected referrals, complaints, second opinions, IFRs and what to do while you wait.
Start here: NHS bariatric surgery is a pathway, not a single appointment
Getting weight-loss surgery on the NHS normally means moving through referral → specialist assessment → multidisciplinary review → preparation → surgery → long-term follow-up. Meeting the BMI threshold gets you into the assessment conversation; it does not automatically book an operation.
The surgery pathway is designed to answer three questions: Would surgery materially improve your health? Are you medically and psychologically ready for it? Which operation is safest and most suitable?
Who should be referred for bariatric-surgery assessment?
NICE NG246 says adults should be offered referral for comprehensive specialist assessment for bariatric surgery if they have:
- BMI 40 kg/m² or more, or
- BMI 35–39.9 kg/m² with a significant health condition that could improve with weight loss, and
- Agreement to the necessary long-term follow-up after surgery.
NICE advises lowering BMI thresholds by 2.5 kg/m² for people from South Asian, Chinese, other Asian, Middle Eastern, Black African or African-Caribbean family backgrounds.
There are also recommendations for expedited assessment in some adults with recent-onset type 2 diabetes.
How does referral usually happen?
Referral commonly starts with your GP, diabetes team, specialist weight-management service or another clinician already involved in your care.
Local pathways differ. Some areas expect previous specialist weight-management input; others route suitable patients more directly into a bariatric service. Referral forms may ask for BMI history, comorbidities, medication, smoking status, previous interventions and evidence of engagement with weight-management support.
Ask exactly what was missing and whether the referral can be resubmitted.
What happens in specialist assessment?
Medical assessment
Diabetes, blood pressure, sleep apnoea, liver disease, cardiovascular risk, anaesthetic risk and medication review.
Dietetic assessment
Eating pattern, protein/nutrition, readiness for post-op dietary stages and lifelong supplementation.
Psychological / behavioural review
Emotional eating, binge eating, expectations, mental health and ability to adapt to major lifestyle change.
Surgical assessment
Which operation fits your anatomy, reflux, diabetes, BMI and risk profile.
Anaesthetic review
Fitness for surgery and risk-reduction planning.
Additional tests
Blood tests, sleep studies, endoscopy or imaging where clinically indicated.
What does the bariatric multidisciplinary team decide?
The MDT pulls together medical, nutritional, psychological and surgical information. It may recommend surgery, ask for further optimisation, recommend another treatment first or decide surgery is currently too risky or unlikely to provide enough benefit.
A “not yet” decision can involve smoking cessation, improved diabetes control, treatment of an eating disorder, stabilising mental health, further weight-management support or additional investigations.
Who decides sleeve vs bypass vs another operation?
The operation is a shared decision between you and the bariatric team. Reflux, type 2 diabetes, BMI, previous surgery, eating pattern, nutritional risk and your preferences all matter.
What happens before surgery?
Preparation may include smoking cessation, medication changes, CPAP use for sleep apnoea, a liver-reduction diet and detailed post-operative diet education.
The operation and hospital stay
Most modern bariatric surgery is performed laparoscopically. Hospital stay depends on the procedure and recovery but is often around 1–3 days for uncomplicated surgery.
Discharge planning should include pain relief, clot prevention, diet progression, wound care, emergency symptoms and contact details for the bariatric team.
What happens after surgery?
NICE and NHS bariatric pathways emphasise long-term monitoring. Specialist services usually manage the early post-operative period before ongoing annual nutritional monitoring moves into primary care according to local arrangements.
Follow-up can include weight trajectory, blood tests, vitamins, protein/nutrition, reflux, mental wellbeing, pregnancy planning and management of weight regain.
How long will I wait for NHS bariatric surgery?
There is no honest single national bariatric waiting-time figure. The total journey can include time waiting for specialist assessment, MDT work-up, investigations, pre-operative preparation and then the surgical list.
National Referral-to-Treatment (RTT) statistics measure consultant-led elective pathways, but they do not produce one simple public “bariatric surgery wait” that applies to every trust.
Ask your service for three separate figures: time to first specialist appointment, time from assessment to MDT decision, and time from surgical approval to operation.
What is the NHS 18-week waiting-time right?
NHS guidance says that, for non-urgent consultant-led treatment in England, you generally have the right to start treatment within 18 weeks from referral, subject to exceptions.
However, complex pathways can include periods where additional assessment, clinical optimisation or patient choice affects the RTT clock. That is one reason the lived bariatric journey can feel much longer than “18 weeks”.
If you are likely to wait beyond the applicable maximum waiting time, NHS guidance says you can ask to be moved to a suitable alternative provider that can see or treat you sooner.
Use My Planned Care to see local waiting information
NHS England's My Planned Care platform publishes average wait-time information at specialty and trust level and provides advice for people waiting for appointments or treatment.
It may not label everything specifically as “bariatric surgery”, but it can help you understand the trust's current planned-care position and what support is available while you wait.
Can I choose a different hospital or bariatric team?
For many first outpatient referrals in England, patients have a legal right to choose among suitable providers and consultant-led teams, subject to exceptions and commissioning arrangements.
If you are facing a long wait, ask your GP/referrer or ICB whether patient choice applies to your bariatric referral and whether another suitable commissioned provider can see you sooner.
The NHS also states that you can ask to be moved to a different provider if you are likely to wait beyond the applicable maximum waiting time.
My bariatric referral was rejected. What should I do first?
Get the reason in writing if possible. Common reasons include:
- Referral criteria not met.
- Missing comorbidity or BMI information.
- Required specialist weight-management input not completed.
- Smoking / medical optimisation requirements.
- Referral sent to the wrong service.
- Local commissioning criteria not met.
Then ask whether the referral can be corrected, resubmitted or redirected.
Is there a formal NHS bariatric-surgery appeal?
There is not one universal national “bariatric appeal form”. The route depends on what decision you are challenging.
| What happened? | Most useful route |
|---|---|
| Referral form rejected / missing info | Correct and resubmit through referrer. |
| Clinician says surgery is not suitable | Ask for reasoning, discuss review and consider a second opinion. |
| Service says you do not meet commissioning criteria | Ask for the written policy; discuss ICB complaints/review and whether exceptional-funding routes apply. |
| Very long wait / access problem | Ask about patient choice, alternative providers, PALS and the waiting-time right. |
| Poor process / communication | PALS or formal NHS complaint. |
Complaints and PALS
NHS England says you have the right to make a complaint about any aspect of NHS care, treatment or service.
PALS can help resolve problems informally, explain local processes and tell you how to make a formal complaint. For commissioning issues, your ICB may be the appropriate organisation rather than the hospital.
A complaint is not a way to force a clinician to recommend unsafe surgery, but it is absolutely appropriate if criteria have been misapplied, communication has failed or the pathway has not been handled properly.
Can I ask for a second opinion?
There is no simple statutory right to unlimited second opinions in ordinary NHS care, but seeking one is recognised as good clinical practice where there is genuine uncertainty or concern.
A second opinion may be useful if you disagree with the procedure recommended, believe surgery has been ruled out for reasons you do not understand, or have a complex risk profile.
It may involve a new referral and therefore another wait.
What is an Individual Funding Request (IFR)?
An IFR is a request made by an NHS clinician for funding for treatment that is not routinely commissioned where the patient's clinical circumstances are considered exceptional.
It is not a general shortcut around ordinary bariatric eligibility criteria. It is relevant only where your clinician believes there is a genuine clinical-exceptionality case or a treatment is not routinely available for someone in your circumstances.
What if my health gets worse while I am waiting?
Tell the service and your GP. New diabetes, worsening sleep apnoea, rising blood pressure, reduced mobility, pregnancy, major weight change or new cardiac/respiratory symptoms can affect urgency, risk and treatment planning.
Do not assume the waiting-list record automatically updates when your health changes elsewhere in the NHS.
Should I go private while waiting?
That depends on health urgency, wait length, finances and the quality of the private service.
Private surgery may shorten the wait but can cost many thousands of pounds. If you go private, clarify exactly who provides long-term nutritional monitoring and manages complications when the package ends.
Questions to ask your NHS bariatric service
- What stage of the pathway am I currently at?
- What is the current wait for first assessment?
- What is the current wait after MDT approval?
- Does the 18-week RTT standard apply to my current pathway?
- Can I use patient choice to move provider?
- What would pause or reset my pathway?
- If I have been rejected, what exact criterion did I fail?
- Can the referral be resubmitted?
- Can I request a second opinion?
- Who do I contact if my health worsens?
- Who handles complaints or access problems?
- Is an IFR relevant in my circumstances?
Shift Says
If you were our brother...
We would keep paperwork. Referral letters, rejection reasons, dates, BMI, comorbidities and who said what.
If the answer is “no”, we'd find out whether it means not eligible, not yet ready, wrong service, missing information, no local funding, or clinically unsuitable. Those are five completely different problems.
And if the problem is simply the wait, we'd ask about patient choice before spending £10,000+ privately.
Printable bariatric-pathway checklist
- I know the NICE referral criteria.
- I know what stage of the pathway I am at.
- I know the current local wait for the next stage.
- I know whether patient choice applies.
- If refused, I have the reason in writing.
- I know whether the referral can be corrected/resubmitted.
- I know when a second opinion may help.
- I know how to contact PALS / complaints.
- I understand IFR is for exceptional non-routine funding, not a routine appeal.
- I know who to tell if my health worsens.
NHS bariatric surgery FAQs
What BMI qualifies for NHS bariatric-surgery assessment?
NICE recommends referral at BMI 40+, or BMI 35–39.9 with a significant weight-related condition, with lower ethnicity-adjusted thresholds for some groups.
Does meeting the BMI criteria guarantee surgery?
No. It guarantees a case for specialist assessment, not automatic surgery.
How long is the NHS bariatric wait?
There is no single national bariatric wait; it varies by trust and by stage of the pathway.
What is the 18-week rule?
For many non-urgent consultant-led pathways in England, patients have a right to start treatment within 18 weeks, subject to exceptions.
Can I move hospitals if the wait is too long?
Potentially. NHS patient-choice and waiting-time rights may allow movement to a suitable alternative provider.
What is My Planned Care?
An NHS England platform showing average local wait information and support for people awaiting planned care.
Can I appeal a rejected referral?
There is no single national bariatric appeal process. The route depends on why the referral was rejected.
What is PALS?
The Patient Advice and Liaison Service helps resolve concerns and explains complaints processes.
Can I request a second opinion?
Yes, you can ask. It may require a new referral and can add waiting time.
What is an IFR?
An Individual Funding Request is a clinician-led request for non-routinely commissioned treatment in exceptional circumstances.
Can an IFR bypass normal BMI rules?
Not as a general rule. It is for genuine clinical exceptionality, not a routine workaround.
What if my referral was missing information?
Ask your referrer to correct and resubmit it.
What if I start Mounjaro while waiting?
Tell the bariatric team; significant weight change and medication use can affect planning.
What if I lose enough weight to drop below the referral BMI?
Tell the service. Eligibility and benefit should be reviewed clinically rather than assumed.
Can I complain about a long wait?
Yes. You can raise concerns with the provider, PALS or the relevant commissioning body.
Who decides which operation I get?
You and the bariatric multidisciplinary team make a shared decision based on anatomy, health and preferences.
How long is follow-up after surgery?
Specialist follow-up typically covers the early post-op period, with lifelong nutritional monitoring needed thereafter.
Can I go private and stay on the NHS list?
Policies and pathways vary; tell both teams and clarify how parallel care will be handled.
Does patient choice always apply?
No. There are exceptions and local commissioning constraints.
What should I do if my health deteriorates while waiting?
Contact your GP and bariatric service so your record and risk assessment can be updated.
Sources & further reading
Waiting-time rights and local bariatric pathways can change. We prioritise current NICE, NHS and NHS England sources and avoid quoting a made-up national “bariatric waiting time”.
- NICE NG246 – Medicines and surgery / bariatric referral criteria
- NHS – Guide to NHS waiting times in England
- NHS – Referrals for specialist care
- NHS – Your choices in the NHS
- NHS England – Patient choice guidance
- NHS England – Minimum standards for planned patient care
- NHS England – My Planned Care
- NHS England – Feedback and complaints
- NHS – PALS
- NHS England – Individual Funding Requests
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