If a patient chooses to seek private treatment, they can self-refer. However, some consultants will only see patients that have a referral from a GP.

If a private provider requires medical information about a patient, this can be provided by the patient by supplying copies of hospital letters received by the patient or by sharing their medical records via the NHS app or online medical records system. Patients can make a SAR (subject access request) to obtain a free of charge printed summary of their medical record.

If a private provider requests more information from a general practice, this can be provided, following consent, and the cost of preparing the report can be charged to the private provider.

The NHS GMS Regulations define essential services as services which are delivered in the manner determined by the GP in discussion with the patient. Therefore, a GP provider should only carry out investigations and prescribe medication for a patient where it is necessary for the GP’s care of the patient and the GP is the responsible doctor.

If the GP considers the proposed investigations to be clinically appropriate, is competent to both interpret them and manage the care of the patient accordingly, then the GP may proceed with arranging the tests or investigations.

However, if the GP does not have the knowledge or capacity to undertake these actions, they should decline to organise the investigation and advise the patient and the provider that the services do not fall within NHS primary medical services and to make alternative arrangements.

Patients are of course entitled to access their medical records, so GPs can provide access to the results of any such investigations for the patient to take back to the private provider.

GMC Good Medical Practice states that doctors in the NHS and private sector should "prescribe drugs or treatment, including repeat prescriptions, only when they have adequate knowledge of the patient’s health and are satisfied that the drugs or treatment serve the patient’s needs."

If requested by a private consultant to initiate or continue prescribing medications, and if the GP agrees with this advice, then this could be appropriate. However, if the GP does not feel competent to prescribe the requested medication, or they do not know if the medication best serves the patient’s need, the GP should inform the private provider that the prescriptions should be provided by a specialist.

It should also be remembered that NHS guidance states that

"where a patient has an immediate clinical need for medication as a result of attending an outpatient clinic, the secondary care provider must supply medication sufficient to last at least until the point at which the outpatient clinic’s letter can reasonably be expected to have reached the patient’s GP, and when the GP can therefore accept responsibility for subsequent prescribing. Consideration should be given to providing a minimum of 7 days’ supply to allow patients sufficient time to contact staff at their general practice."

This applies equally to private and NHS providers.

Sometimes the care of a patient is shared between two doctors, usually a GP and a specialist, and there is a formalised written ‘shared care agreement’ setting out the position of each, to which both parties have willingly agreed. Where these arrangements are in place, GP providers can arrange the prescriptions and appropriate investigations, and the results are fully dealt with by clinicians with the necessary competence under the shared care arrangement. There is NHS guidance available about this.

Shared Care with private providers is not recommended due to the general NHS constitution principle of keeping as clear a separation as possible between private and NHS care. Shared Care is currently set up as an NHS service, and entering into a shared care arrangement may have implications around governance and quality assurance as well as promoting health inequalities. A private patient seeking access to shared care should therefore have their care completely transferred to the NHS. Shared care may be appropriate where private providers are providing commissioned NHS services and where appropriate shared care arrangements are in place.

All shared care arrangements are voluntary, so even where agreements are in place, practices can decline shared care requests on clinical and capacity grounds. The responsibility for the patient’s care and ongoing prescribing then remains the responsibility of the private provider.