Allergy Immunotherapy Cost and Coverage for Hay Fever

When you have severe hay fever, your doctor may bring up allergen immunotherapy, also called allergy shots or hyposensitisation. Whether the NHS or your US insurer funds it, who refers you, and what it costs all vary. What you can do in any system is keep a season-by-season symptom log. In the hay fever diary in Sam, the entries you make today carry the day's pollen level for your location when you share it. It sits next to your notes, so you do not match pollen data and symptoms by hand. This text is general information, not medical or legal advice.

On the NHS, immunotherapy for hay fever is available after a GP refers you to a specialist allergy clinic, and availability varies by area. In the US, insurance often covers allergy shots when medically necessary, while sublingual tablets usually need prior authorization and drops are generally not covered. Your clinic or insurer gives the exact cost.

What is allergen immunotherapy for hay fever?

Allergen immunotherapy, sometimes called AIT, gives a standardised extract of the allergen you are sensitive to, so your body builds tolerance over time. For hay fever there are two forms.

• Subcutaneous immunotherapy (SCIT): injections under the skin, given in a clinic, often in a build-up then a maintenance phase.
• Sublingual immunotherapy (SLIT): tablets or drops held under the tongue, with the first dose given under supervision.

It is normally considered for people with moderate to severe hay fever whose symptoms continue despite symptom-relieving medicines, or who cannot tolerate them. A full course usually lasts at least three years. This text gives no dosing or brand advice.

How does allergy immunotherapy work on the NHS in the UK?

In the UK, immunotherapy for hay fever is available on the NHS after referral. The route usually starts with a GP, who refers you to a specialist allergy clinic. There, an allergist or specially trained doctor confirms the allergy, often with a skin prick test or a blood test, and decides whether immunotherapy suits you.

NICE has appraised a few sublingual products for specific allergies, such as house dust mite and birch tree pollen. In England, where NICE recommends a product, the NHS must fund it under set rules; Scotland, Wales and Northern Ireland have their own routes. In practice, access depends on your referral and your local area's commissioning and formulary, so availability varies.

SCIT requires regular clinic visits and close observation after each injection, because a small risk of a reaction exists. SLIT is often more convenient, with the first dose in the clinic and later doses at home. Your specialist plans all of this.

How does insurance treat allergy immunotherapy in the US?

In the US, allergy shots are the most established form of allergen immunotherapy. They are often covered by insurance when a doctor considers them medically necessary for allergic rhinitis, and when standard medicines have not controlled your symptoms.

The picture differs for tablets. A few sublingual products are FDA-approved, for grass, ragweed and dust mite allergy. These usually need prior authorization from your plan. Under-the-tongue drops are not FDA-approved and are generally not covered by insurance.

Whether your plan treats immunotherapy as preventive or as treatment, and what documentation it asks for, varies. Allergen immunotherapy is used when symptoms persist despite standard medicines, and it aims to change the immune response over time. Ask your insurer about its own criteria rather than assuming a single national rule.

What does it cost?

In the UK, if your NHS area funds immunotherapy after your referral, the treatment itself is NHS funded. In England a prescription charge per item can still apply to take-home tablets unless you are exempt, while prescriptions are free in Scotland, Wales and Northern Ireland. Local availability also differs. Privately, costs vary widely by clinic, product and how long you treat, so it is worth asking the clinic for a written price before you start.

In the US, your out-of-pocket cost depends on your plan: your deductible, coinsurance and the number of clinic visits for shots. Sublingual tablets may carry prior authorization and their own cost share, and some manufacturers offer assistance programs that change. There is no single figure worth repeating here; your insurer and pharmacy give you the real number.

Who decides, and how long it lasts

An allergy specialist decides whether immunotherapy is suitable, based on your symptom history and allergy test results. The first dose and any build-up happen under supervision in a clinic, because of the small risk of a reaction.

A full course is usually around three years, with regular reviews of how you are doing. Staying consistent matters, because the immune response builds over time. Your allergy team decides whether to continue, pause or stop.

Keep a season-by-season symptom log

Across pollen seasons you can gather what a clinic cannot see: how your symptoms and medicine use change from year to year. For each season, note:

• Days with nose, eye or other hay fever symptoms
• Days you took hay fever medicine
• Nights with disturbed sleep
• Which weeks were worst, and the pollen levels you remember or measured

A season-by-season log lets you lay one year next to another. It is documentation for the conversation with your allergy team, not proof of a cause. What a change means is for your doctor to say. Our guide to a hay fever symptoms season diary shows a simple format.

Log each pollen season in Sam and take the report to the allergy clinic

You bring one report per season instead of a guess about last summer.

• In the hay fever diary, entries you make today carry the day's pollen level and air quality for your location when you share it, next to your notes, instead of you matching pollen data to symptoms by hand.
• The doctor report as a PDF covers the period you choose, so you can lay one season against the next.
• You log the hay fever medicines you took, so the medicine burden across seasons is visible.
• Off-season symptoms go in the symptom diary.

Sam does not say whether immunotherapy works for you, and it does not arrange referrals or funding. Your allergy team and insurer decide that.

Try Sam Health

Sam is a wellness companion, not a medical device. The app does not diagnose, treat, cure or prevent any condition or health state. Always consult qualified professionals for medical decisions.

General information, not medical or legal advice. Funding, coverage and prices change, and your NHS area or plan may differ. Ask your allergy team and insurer about your own case.

Related reading

• Hay fever symptoms and a season diary
• Living with allergic rhinitis through pollen season
• Getting a copy of your medical records when changing doctor
• Allergy Skin Prick Test: Preparation, Antihistamines

Sources

Updated: October 2026

• NICE: 12 SQ-HDM SLIT for treating allergic rhinitis and allergic asthma caused by house dust mites (TA1045) and Betula verrucosa 12 SQ-Bet SLIT for tree pollen allergic rhinitis (TA1087)
• BSACI: Immunotherapy for allergic rhinitis
• Allergy UK: Allergic rhinitis - an overview and treatment
• ACAAI: Sublingual immunotherapy (allergy tablets) and New guidelines for insurers on allergen immunotherapy
• Cigna: Allergen immunotherapy - grass pollen sublingual products prior authorization policy
• NHS Hampshire and Isle of Wight: netFormulary, allergen immunotherapy
• NHS: NHS prescription charges and Hay fever