Transgender Health Care
https://www.healthcare.gov/transgender-health-care/
Healthcare/A federal government website managed by the U.S. Centers for Medicare & Medicaid Services. 7500 Security Boulevard, Baltimore, MD 21244
"Applying for Marketplace coverage
When you apply for Marketplace coverage as a transgender person, you should use the first, middle, and last name that are on your Social Security card. If you get a letter or an email saying there are "inconsistencies" or "data matching issues" in your application because your name doesn't match the name on file with the Social Security Administration (SSA), you can go back to your application and update your name."