I am not aware of any individual (ones you can purchase on your own) health insurance policy in the United States that covers SRS.
The only health insurance policies that I'm aware of in the US that cover SRS are ones that you get through a place of work. These are not available for individuals to purchase, but any company can call their insurance provider and have it added to their group plan.
The HRC has an index of companies that do include SRS in their group plan, but you can't go out and buy that plan and get SRS covered. So Aetna, Cigna, Blue Cross/Sheild all have SRS inclusive plans - but they are group plans only available to certain companies to pay for that coverage for their employees.
If you're interested in SRS inclusive care, the
HRC list is a great place to look for a job and apply at those companies that are inclusive. Otherwise as an individual so far as I know it's impossible to find an individual plan that covers it. I fortunately work for a company that does pay for SRS (through their Cigna plan), however it's not available for purchase. If I was to lose my job I'd certainly pay for COBRA until my surgery is complete.
I hope this is helpful even though I don't have good news.