Does my health plan have to cover this? What do Marketplace plans cover?

HealthCare.gov lists 10 kinds of care all Marketplace plans must cover [1]: 1. Care you get without a hospital stay 2. Emergency care 3. Hospital stays, like surgery 4. Care for pregnancy, birth and newborns 5. Mental health and drug or alcohol care, like counseling 6. Prescription drugs 7. Rehab care and devices 8. Lab tests 9. Care to stay well, and care for long-term illness 10. Care for children, including dental and eye care

Adult dental and vision are not on the list [1].

This list is for Marketplace plans. Large employers that "self-insure" pay their workers' care costs directly. HealthCare.gov says they don't have to give these benefits, but many do. Ask your employer [1].

If your plan denies a service, you can appeal. File within 180 days of the denial notice [2].

Open HealthCare.gov's "What Marketplace health insurance plans cover" and read the list of 10. Whether your exact service is paid, and what you pay, is in your own plan papers — the sources here can't say.