Guide
Self-pay or private medical insurance: how the cost conversation differs
Updated
Both routes end in the same operating theatre. They fail in different places, so the questions worth asking are not the same.
Self-pay: the risk is in the exclusions
If you are paying yourself, your exposure is whatever the package leaves out: the consultation, diagnostics, extra nights, take-home drugs, aftercare and, above all, complications. PHIN's advice is to ask if the price is part of a package and exactly what that includes, and to "always ask for a written quotation" before agreeing to anything (PHIN, updated 16 June 2026).
Insurance: the risk is excess and shortfall
PHIN distinguishes the two gaps insurance leaves. Your excess is "a fixed amount you agreed to pay towards a claim when you bought your insurance", a known quantity. A shortfall is different: "an unpredictable gap that appears if your consultant charges more than your insurer will pay". Because specialists often work independently and set their own fees, a consultant's bill can exceed what a policy covers.
PHIN's answer to that is the term "fee-assured": a fee-assured consultant has an agreement with your insurer to charge only within their approved rates, and choosing one is described by PHIN as "the single most effective way to prevent a 'shortfall'". It also stresses getting preauthorisation from your insurer first, so you know what will and will not be paid.
The NHS route stays open
Going private for one thing does not remove your NHS entitlements. Under the NHS Constitution, if a GP refers you for a non-urgent condition you have the right to start consultant-led treatment within 18 weeks, unless you choose to wait longer or waiting is clinically right for you, and you have the legal right to ask to be seen by a different provider if you are likely to wait longer than the maximum (NHS guide to waiting times in England). In most cases you can also choose which hospital in England to attend for a first outpatient appointment, and which consultant-led team will be in charge of your treatment (NHS referrals for specialist care). Comparing the private price against the wait actually offered to you, rather than a national headline, is the more useful comparison.
Where NHS and private care meet, there are rules. The Department of Health and Social Care publishes guidance for the NHS on patients who wish to pay for additional private care, setting out principles on the boundaries between the two (gov.uk, DHSC guidance). If you are mid-pathway on the NHS, raise it with your GP or the treating team before booking privately.
A referral is still worth having
The NHS advises that if you want to see a private specialist, "you're still advised to get a letter of referral from your GP", because the letter carries your medical history and the details the specialist needs (NHS, page last reviewed 12 April 2023). Some private providers will accept a self-referral for an initial consultation; a GP letter still makes that first appointment better informed.