Before paying for an online medical certificate in the UK, check three things. First, whether the provider has the appropriate healthcare regulatory registration for its location and activities. Second, whether the doctor is registered with the General Medical Council and licensed to practise, and whether the organisation requesting the certificate will accept the document being offered.
Those checks take about five minutes between them, and they are the difference between a document that does its job and a document that gets rejected.
Everything after that is practical detail. What the service needs from you, how long it takes, what happens if the doctor says no, and whether you get your money back.
5 Key Takeaways
An online doctor service based in England that treats people in England normally has to be registered with the Care Quality Commission, and operating without that registration is an offence.
You can check any UK doctor yourself on the GMC register. It is free, public and takes a minute.
A private medical certificate is not an NHS fit note. Whoever asked for it decides whether to accept it, so ask them before you pay.
A legitimate service asks clinical questions and a doctor reviews your answers. A certificate promised with no assessment is the clearest warning sign there is.
Check the daily cut-off time and the refund position before you pay, not after.
What Does an Online Medical Certificate Service Actually Do?
It connects you to a doctor who reviews evidence about your situation and decides whether to issue a certificate.
That distinction matters more than it sounds. You are paying for a clinical assessment, not for a document. The doctor can decline, and a service that cannot decline is not really running an assessment at all.
The certificates people need usually fall into three groups.
Sickness evidence for an employer, such as a private work sickness certificate covering a period of absence.
Travel documents, including fit-to-fly, fit-to-cruise and letters confirming you were unfit to travel for an insurance claim.
Visa and employment certificates, including a certificate of good health or a country-specific visa medical certificate.
Each one has a different person checking it at the other end. An HR manager, an airline, a claims handler, a consulate. That is why acceptance matters more than price, and why the right question is never simply which service is cheapest.
Seven things to check before choosing an online medical certificate provider, including warning signs that could lead to delays or rejected certificates.
How Big Is the Private Primary Care Market in the UK?
Large enough that choosing between providers is now a real decision rather than a formality.
Research published by LaingBuisson in September 2024 estimated that 13% of adult GP consultations were privately paid, compared with around 3% in 2009. The report valued the private GP market at approximately £1.6 billion and identified just over 550 CQC-registered services offering private GP consultations in mid-2024.LaingBuisson
Virtual and online consultations make up a growing share of that, valued at over £300 million.
Two things follow from those numbers. There is genuine choice, which is good. And there are enough providers that quality varies considerably, which is why the checks below are worth doing rather than picking the first result you see.
How Do You Check the Service Is Properly Regulated?
Start with the Care Quality Commission.
The CQC guidance on choosing an online healthcare service says that online doctor services based in England, treating people in England, are mostly registered and regulated by the CQC. The same page sets out what to check before you use one.
This is not a formality. In 2022 the CQC prosecuted an online doctor service operating without registration. The provider pleaded guilty and was ordered to pay £13,670. Online healthcare providers based in England must register with the CQC when they carry out activities requiring registration, unless an exemption applies. These activities can include treating disease, disorder or injury, diagnostic and screening procedures, and certain remote medical advice services.prosecuted an online doctor service operating without registration
You can search the CQC website for the provider name. If a service treating people in England is not there, that is a question worth asking before you go any further.
Two caveats worth knowing. The CQC can only register services based in England, so a provider operating from elsewhere in the UK is regulated differently rather than not at all. And a registered service can still be rated poorly, so read the rating rather than treating the listing itself as the answer.
How Do You Check the Doctor Is Registered?
Search the GMC register. It is free, open to the public, and takes about a minute.
The General Medical Council maintains the UK medical register. You can check whether a doctor is registered and, importantly, whether they hold a licence to practise. Registration alone does not necessarily mean a doctor currently holds a licence. If a service names its doctors, or prints a GMC number on the certificate it issues, you can verify that directly rather than taking the website’s word for it.
The GMC has urged patients to check that a service and its doctors are registered with UK regulators before using online services, and makes the point that the same standards of good practice apply to online consultations as to face-to-face care.
For visa and overseas employment certificates there is a second layer. Some consulates require medical certificates to be legalised through the FCDO’s Legalisation Office before they can be used abroad. The FCDO verifies eligible signatures, stamps or seals and issues an apostille. Applicants should confirm both that the document can be legalised and that it meets the receiving consulate’s specific requirements. If a service cannot tell you whether its doctors meet that requirement, it is not the right service for a visa certificate, however good it may be for a sick note.
Will the Certificate Actually Be Accepted?
This is the question most people skip, and it is the one that costs money.
A private medical certificate is a different document from an NHS fit note. GOV.UK guidance says doctors working in private practice may produce private medical certificates, and that these may be accepted in the same way as a fit note, but acceptance is up to the employer.
So ask first. An email to HR can clarify the position before you pay.
The same logic applies everywhere else. An airline sets its own rules on fit-to-fly documentation and the timing it will accept. A cruise line sets its own. A consulate will often specify the exact wording it wants and reject anything that does not carry it, regardless of how well the rest of the document is prepared.
A good service will tell you plainly what its certificate covers and who decides whether to accept it. Treat any claim of universal acceptance with suspicion, because no private certificate has it.
Before paying for an online medical certificate, check the provider, verify the doctor and confirm the certificate will be accepted.
What Should You Expect on Turnaround and Cut-Off Times?
Most people looking for an online certificate are looking because something is urgent, so turnaround usually decides the choice.
Check three things, because providers describe them differently.
The stated turnaround once the doctor has everything they need, not from the moment you land on the site.
The daily cut-off time for same-day service, which is often earlier than people assume.
Whether the clock starts when you pay or when you finish uploading your evidence, because those can be hours apart.
A one-hour turnaround means nothing if you submitted at 10pm and the cut-off was 9pm.
Also check how the certificate arrives. Most sickness and travel certificates are emailed. Visa certificates often need the original paper document with a wet ink signature, which means posting, which means allowing days rather than hours. If your deadline is fixed, work backwards from it.
What Happens if the Doctor Declines?
Ask before you pay, because the answer genuinely varies between providers.
A certificate is a clinical decision. If the evidence does not support it, a doctor can ask for more information or decline to certify. That is what proper regulation looks like, not a fault in the service, and a provider that never declines anything should worry you more than one that does.
What matters is what happens next. Does the provider refund you, hold the payment while you supply more information, or keep it? Reputable services publish their position. If you cannot find it on the site, ask by email so you have the answer in writing before you commit.
| What to check | What good looks like | Warning sign |
| Regulation | CQC registered, with a rating you can read | No evidence of required regulatory registration, or no clear explanation of why the provider is exempt. |
| Doctor | Named, or a GMC number on the certificate you can verify | No way to identify or check the doctor |
| Assessment | Clinical questions about your situation, reviewed by a doctor | A certificate promised with no assessment |
| Acceptance | Clear about what the certificate is and who decides | Claims of universal acceptance |
| Turnaround | A stated turnaround and a published daily cut-off | Vague promises of speed with no cut-off |
| If declined | A published refund or resubmission position | Nothing stated anywhere |
| Verification | A GMC number and a way for the recipient to check it | An unverifiable PDF |
How Does This Work in Practice?
Here is how the checks play out on a realistic example.
Say you have been off work for nine days, your surgery cannot see you for three weeks, and HR has asked for evidence. You find two online providers, one at £25 and one at £49.
You search both names on the CQC website. One is registered with a rating you can read. The other has no listing at all, despite saying it treats people across England. That narrows the choice before price enters the conversation.
You then email HR with a single question. Will they accept a private medical certificate from a GMC-registered doctor, or do they specifically need an NHS fit note? If only a fit note will do, you have saved yourself the cost of a document that was never going to work, and you go back to the surgery or another eligible professional instead.
If HR says a private certificate is fine, you check the cut-off time, submit well inside it, and keep the confirmation. The checks involve two searches and one email.
What Does a Properly Run Assessment Look Like?
It helps to know what to expect, so you can tell a real assessment from a form that simply takes payment.
A ZoomDoc work sickness assessment runs like this.
You complete a medical questionnaire about your illness, when it started and how it affects your ability to work.
You upload a short video, usually 30 seconds to a minute, describing your symptoms.
You provide photo ID, your workplace name and your regular GP’s details if you have one.
A GMC-registered doctor reviews the evidence and decides whether to certify.
If approved, the certificate is emailed to you, typically within one to two hours, carrying the doctor’s GMC registration number and a QR code your employer can use to verify it.
Uploads need to be in by 9pm for same-day service, and each certificate covers up to seven days at a time, so a longer absence needs fresh evidence. The doctor can decline where the evidence is not sufficient.
Our doctors work to a published medical and ethical Code of Practice, and you can read more about getting sickness evidence without seeing a doctor in person.
Which Warning Signs Should Make You Walk Away?
A few are worth taking seriously.
No questions asked. If the site sells a certificate without a clinical assessment, the document carries little weight with the person who asked for it.
No doctor you can identify. A certificate with no name, no GMC number and no verification route is easy for an employer or consulate to query and easy to reject.
No regulatory footprint. The CQC has taken action against services operating without registration, so an absence of any listing deserves a question.
Guaranteed approval. A doctor who cannot say no is not exercising clinical judgement, and the certificate reflects that.
Pressure tactics. Countdown timers and urgency messaging on a medical document are a marketing choice, not a clinical one.
Making the Right Choice Before You Pay
Check that the service has the appropriate regulatory registration where required. Verify the doctor on the GMC register, including their licence to practise. Ask whoever wants the certificate whether they will accept a private one. Then look at turnaround, the daily cut-off, and what happens if the doctor declines.
Five minutes of checking is cheaper than paying twice, and far cheaper than missing a deadline because the first certificate came back rejected.
ZoomDoc is a CQC-registered provider, and its medical certificates are assessed by GMC-registered doctors. Certificates carry the doctor’s GMC number and a QR code so the recipient can verify them directly.
You can see the full range of medical certificates available, including sick notes for work and visa medical certificates.
FAQs
Is an Online Medical Certificate Legal in the UK?
Yes. A private medical certificate from a registered doctor is a lawful document. Whether it is accepted is a separate question, decided by the employer, airline, university or consulate asking for it.
How Much Should an Online Medical Certificate Cost?
Prices vary by certificate type, because a sickness certificate and a visa certificate involve different work. Compare like for like, and check whether the price includes postage for documents that need an original wet ink signature.
Can I Get a Refund if the Doctor Says No?
It depends on the provider. Look for a published position on declined assessments before you pay, and ask in writing if you cannot find one on the site.
How Do I Check a Doctor Is Registered With the GMC?
Search the doctor’s name or GMC number on the GMC online register. It is free, public, and the quickest check on this list.
What Is the Difference Between a Private Certificate and an NHS Fit Note?
An NHS fit note is the official statement of fitness for work from a healthcare professional. A private medical certificate is clinical evidence from a doctor in private practice. Employers can accept either, but only the fit note is the standard document after seven days of absence.
Does a Visa Certificate Need Anything Extra?
Often, yes. Many consulates want the original paper certificate, sometimes an apostille from the FCDO, and sometimes an official translation. Check the consulate’s own published requirements before you order anything.
What if the Service Is Based Outside England?
It will be regulated by a different body rather than the CQC, so check which regulator covers it and look for the equivalent registration. The GMC check on the doctor applies wherever in the UK the service is based.