it depends on the provider, honestly. i recommend being very straight up with them and saying you're coming in looking for a letter of support. some insurances/hospital teams require you to have an existing relationship with the provider, while others are fine with you meeting with them just for the consultation. it may help to pitch it as an official signature on your mental state (good enough to make this decision) and saying essentially "yes, i testify that _____ told me that they experience
dysphoria and would best alleviate it with _____." your hospital may have example letters (not common, im sure, but wouldn't hurt to ask) which a provider unfamiliar with writing support letters would probably find helpful. lord knows mine did. hate that we have to go through all these hoops, but also, happy for you op! congratulations on taking your next steps!