Upvote:2
The US State Department explains what documents you will need with respect to your medical condition to obtain a B-2 visa for medical treatment:
If you are seeking medical treatment in the United States, the consular officer may ask for further documents at your visa interview, which may include:
- Medical diagnosis from a local physician, explaining the nature of the ailment and the reason you need treatment in the United States.
- Letter from a physician or medical facility in the United States, stating they are willing to treat your specific ailment and detailing the projected length and cost of treatment (including doctorsβ fees, hospitalization fees, and all medical-related expenses).
- Proof that your transportation, medical, and living expenses in the United States will be paid. This may be in the form of bank or other statements of income/savings or certified copies of income tax returns (either yours or the person or organization paying for your treatment).
It is clear that the document you posted would not be sufficient to meet the first requirement; it does not fully explain the medical condition and does not explain at all why treatment in the United States is necessary or advisable.
Upvote:2
It is unclear whether you will actually need to apply for a visa at all. The category "medical treatment" falls under a B-2 Visitor Visa, which is the visa that virtually all tourists will get. Assuming you are a UK citizen, you are likely eligible for the Visa Waiver Program which allows the same activities as a Visitor (B) visa, including medical treatment.
A restriction that may apply to you is the maximum stay of 90 days under the VWP. Given that you cannot "travel for long periods abroad", this is unlikely to be a problem.
If for some reason you do not qualify for the VWP, you may still apply for a B-2 visa. However there is no requirement to justify your need for medical treatment in such an application.