US No Surprises Act (42 USC 300gg-111 to 300gg-139) and 45 CFR Part 149 149.310(a)(1)-(2): Let each enrollee designate any available participating primary care provider, and any participating pediatrician for a child

A plan or issuer that requires or allows designation of a participating primary care provider must permit each participant, beneficiary or enrollee to designate any participating primary care provider available to accept them, subject only to reasonable geographic limits under the plan terms, provider contracts and State law; for a child it must permit designation of a participating allopathic or osteopathic physician specializing in pediatrics (including subspecialties within the provider's licence) who is available to accept the child, without waiving coverage exclusions for pediatric care.