Question regarding hair loss

I am currently experiencing early-stage M-shaped hair loss, and my hairline has become significantly thinner than before.
I am planning to visit a clinic to get a prescription for medication.
I am wondering whether I should visit an internal medicine clinic, a dermatology clinic, or a urology clinic. I am also curious if hair loss medication is covered by private health insurance.
I would appreciate any advice from those who have dealt with early-stage hair loss.