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Every Line on Your NHS Appointment Letter, Decoded (UK 2026)

NHS appointment letters are packed with codes, department names, and abbreviations that mean nothing to most people. This plain-English guide decodes every section — so you know exactly what to bring, where to go, and what happens if you need to rearrange.

The Clarify Team

— 8 min read
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⚡ 2026 update: NHS England's new Referral to Treatment (RTT) targets took effect in April 2026, meaning waiting times and pathway codes on your letter may look different to previous years. The plain-English breakdown below reflects the current system.

At a glance

  • Your NHS appointment letter contains a booking reference, an RTT pathway number, and often a specialty code — none of which are self-explanatory.
  • The department name on the letter is often an internal NHS label, not the name a GP would use. "General Surgery Outpatients" might just mean a routine follow-up.
  • Letters from Choose and Book / NHS e-Referral Service (e-RS) look different to direct consultant letters — but both are valid.
  • If the letter says "please confirm attendance", you usually have 14 days to respond or the slot may be released.
  • You can request a reasonable adjustment (e.g. a ground-floor room, a British Sign Language interpreter) by contacting the number on the letter before the appointment.
  • Not medical or legal advice: This article explains NHS letter formats in plain English. For your specific situation, speak to your GP, the hospital's patient services team, or Citizens Advice.

An envelope arrives with an NHS logo. Inside is a letter full of reference numbers, department codes, and instructions that assume you already know how the hospital system works. Most people don't — and that's not their fault.

NHS appointment letters were designed to move information between departments quickly, not to communicate clearly with patients. The result is that millions of people turn up to the wrong entrance, forget essential documents, or miss a deadline to confirm their slot — through no fault of their own.

This guide walks through every section of a typical NHS outpatient appointment letter, in the order you'll usually see it, and explains what it actually means.

The header: trust, hospital, and contact details

The very top of the letter will name the NHS Trust — this is the organisation running your hospital. A trust can run several hospitals and clinics across a region, so the trust name and the hospital name may be different. Always check the hospital or clinic address in the body of the letter, not just the trust name in the header.

You'll usually find:

  • A phone number — often a central switchboard, not the specific department. If you need to rearrange, ask for the outpatient bookings team for the relevant specialty.
  • A Patient Advice and Liaison Service (PALS) number — PALS handles concerns and complaints. Not needed for routine bookings, but useful if something goes wrong.
  • A date the letter was produced — this matters because appointment slots can sometimes lapse if you don't confirm within a set window.

Your details section

Below the header you'll see your name, address, and often:

  • NHS Number — your unique 10-digit patient identifier. Keep this safe. It's on your Summary Care Record and speeds up every interaction with NHS services.
  • Date of birth — always check this is correct. A wrong DOB can cause delays or mix-ups with records.
  • Hospital number / patient ID — an internal reference used by that specific trust. Different from your NHS number.

The referral and pathway section

This is where most of the confusing codes live.

RTT pathway number

RTT stands for Referral to Treatment. This number tracks your journey from the moment your GP referred you to the moment your treatment is completed (or you're discharged). Hospitals use it to manage waiting-time targets. You don't need to do anything with this number — but if you're ever chasing up a referral, quoting it speeds things up.

Specialty or department code

NHS specialties have standardised codes. For example, "300" means General Medicine, "502" means Gynaecology, and "120" means ENT (ear, nose, and throat). You'll rarely see the numeric code on a patient letter, but you will see the department name — which isn't always the same as what your GP told you.

Common examples of confusing names:

  • "Ophthalmology" = eye clinic
  • "Dermatology" = skin clinic
  • "Haematology" = blood disorders
  • "Gastroenterology" = stomach, bowel, and liver
  • "Rheumatology" = joints, muscles, and autoimmune conditions

If you're unsure which department your appointment is with, call the hospital and quote the department name on the letter — they'll confirm what it covers.

e-Referral / Choose and Book reference

If your GP referred you through the NHS e-Referral Service, you'll have a unique booking reference — usually a mix of letters and numbers. This lets you manage your appointment online at nhs.uk/patient-booking or by calling the national booking line. If your GP booked you directly into a slot, you won't have this reference.

The appointment details

Date, time, and location

Straightforward — but check the building or clinic name, not just the hospital name. Many large hospitals have outpatient clinics in separate buildings, sometimes across the road or in a different postcode. The letter should give you a full address. If it doesn't, call the department before you travel.

"New" vs "Follow-up" appointment

Letters often state the appointment type:

  • New outpatient appointment — first time seeing this consultant or team about this problem.
  • Follow-up or review appointment — a subsequent appointment after an initial consultation or procedure.
  • Pre-operative assessment (POA) — a check-up before a planned operation. Often involves blood tests, an ECG, and a medication review.
  • Day case — you're coming in for a procedure and going home the same day. You'll usually be asked to fast beforehand.

Estimated duration

Some letters include how long the appointment is expected to take. This is the clinic slot, not the total time you'll be at the hospital. Plan for at least 30–60 minutes extra for registration, waiting, and any tests the clinician orders on the day.

Confused by the codes and jargon on your letter?

Upload your NHS appointment letter to Clarify and ask in plain English — "What do I need to bring?", "Where exactly do I go?", or "What does this department actually treat?" Clarify reads the document and gives you cited, plain-English answers in seconds.

Try Clarify free → getclarify.co.uk

The "what to bring" section

Most NHS letters include a list of things to bring. Don't skip this section — turning up without the right items can mean the appointment can't go ahead.

Standard items often listed:

  • A list of your current medicines — including dosages, or the actual boxes/packets if easier.
  • Glasses or hearing aids — if relevant to the appointment.
  • Previous X-rays, scans, or test results — particularly if you've had these done at a different hospital.
  • A urine sample — some clinics (especially urology and maternity) ask you to bring one. They'll specify the container type.
  • Any letters from your GP or other specialists about this condition.

Fasting instructions

If the letter says "nil by mouth from midnight" or "please fast for X hours before your appointment", take this seriously. For blood tests it usually means no food for 8–12 hours and water only. For procedures under anaesthetic, fasting is essential for safety. If you're unsure, call the department — they'll clarify.

Confirmation and cancellation instructions

Some letters require you to confirm you're attending. There's usually a phone number, a web link, or a text service. If the letter says "please confirm within 14 days", do it promptly — NHS systems can automatically release unclaimed slots back into the pool.

If you need to cancel or rearrange, call as early as possible. Most hospitals have a 24-hour cancellation line. Repeated missed appointments without notice can, in some trusts, trigger a policy of returning you to your GP for re-referral — which resets your waiting time.

Accessibility and reasonable adjustments

Every NHS organisation has a legal duty under the Equality Act 2010 to make reasonable adjustments for disabled patients. You can request:

  • A ground-floor or accessible room
  • A BSL interpreter or lip-speaker
  • An interpreter for a language other than English
  • Extra appointment time if you have a cognitive or communication need
  • A quiet waiting area if you have sensory sensitivities

Contact the number on the letter before your appointment and explain what you need. Give as much notice as possible — interpreters in particular need to be booked in advance.

If the letter looks wrong

Check the date immediately. If the appointment date has already passed, call the department — you may need to be re-booked. If your name, date of birth, or NHS number are wrong, flag this before the appointment; mismatched records can cause delays with test results.

If you believe you've been waiting longer than the NHS target (currently 18 weeks from referral to first definitive treatment), you can ask your GP or the hospital's patient services team to check your RTT clock start date.

Get instant answers from your NHS letter

Instead of searching the internet or waiting on hold, upload your appointment letter to Clarify. Ask anything — "Do I need to fast?", "What's an RTT number?", "Where is this clinic?" — and get a plain-English answer drawn directly from your document.

Upload your letter free → getclarify.co.uk

Frequently asked questions

What is an NHS Number and do I need it for my appointment?

Your NHS Number is a unique 10-digit identifier assigned to you at birth (or when you first registered with an NHS GP). You don't need to memorise it, but bringing a document that shows it — such as a previous NHS letter — can speed up registration at the front desk and helps staff pull up your records quickly.

What does "RTT pathway" mean on my letter?

RTT stands for Referral to Treatment. It's the NHS's system for tracking how long patients wait from the date of referral to the start of their treatment. The pathway number on your letter is an internal reference. NHS England's target is that at least 92% of patients should wait no longer than 18 weeks. You can ask the hospital for your RTT start date if you're concerned about your wait.

My letter says "new outpatient appointment" — what should I expect?

A new outpatient appointment is usually a first consultation with a specialist or their team. The clinician will review your history (often sent ahead by your GP), examine you if needed, and discuss next steps — which might include tests, a follow-up, or a treatment plan. Appointments typically last 15–30 minutes, though you should allow longer for the full visit.

Can I bring someone with me to my NHS appointment?

Yes, in most cases. NHS guidelines support patients bringing a friend, family member, or carer. It's worth calling ahead for procedures or assessments where space is limited, but routine outpatient appointments almost always accommodate a companion. Let reception know when you arrive.

What happens if I miss my appointment?

You should always contact the department as soon as possible if you can't attend. If you simply don't turn up (a "did not attend" or DNA), the clinic will usually write to you and may ask your GP to re-refer. Some trusts have policies that discharge patients after one or two missed appointments without notice, restarting the waiting-time clock. Always cancel proactively, even at short notice.

What if I can't read the letter clearly or English isn't my first language?

You have a right to receive information in a format you can understand. You can request a translated letter, a telephone interpreter for your appointment, or a face-to-face interpreter by contacting the hospital's patient services team. NHS trusts are required to provide these services under the Equality Act 2010 and NHS Constitution commitments.

The department name on my letter doesn't match what my GP told me — is it the right appointment?

This is common. NHS department names are often more technical than the terms a GP uses. For example, a GP might say "I'm referring you to the bowel clinic" and the letter might say "Gastroenterology Outpatients". If in doubt, call the hospital and quote the department name on the letter — they can confirm whether it matches your referral.

My appointment letter doesn't say what to bring — do I still need to prepare?

Yes. Even if the letter doesn't list specific items, it's always worth bringing a current list of your medications (with dosages), your GP surgery's name and address, and any relevant previous test results or letters. For specialist appointments, bringing a brief written summary of your symptoms and when they started can help you make the most of a short slot.

This article is for general information only and does not constitute medical, legal, or professional advice. NHS processes and letter formats vary between trusts and can change. For advice about your specific situation, speak to your GP, the hospital's patient services team, or contact Citizens Advice at citizensadvice.org.uk.

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