What Is a Referral?
A referral is a written order from your primary care physician (PCP) directing you to a specialist. HMO plans require referrals for most specialist visits — without one, the plan won't cover the visit and you pay out of pocket.
Which Plans Require Referrals?
- HMO: Referral required for specialists. You must see your PCP first.
- PPO: No referral needed. See any specialist directly, in or out of network.
- EPO: Usually no referral needed, but must stay in-network.
- POS (Point of Service): Referral needed for in-network specialists; can go out-of-network without referral at higher cost.
How the Referral Process Works
- You visit your PCP with a concern
- PCP determines you need a specialist
- PCP submits a referral to your insurance (often electronic)
- Insurance approves the referral (usually same day)
- You schedule with the specialist
Exceptions: Even on HMO plans, you typically don't need a referral for OB/GYN visits, mental health services, or emergency care. Check your specific plan — some HMOs are more restrictive than others.
Referrals vs. Prior Authorization
A referral is permission from your doctor to see a specialist. Prior authorization is approval from your insurance company for a specific procedure or treatment. You may need both — a referral to see the specialist and prior authorization for the procedure they recommend.
Related Terms
Last updated: March 30, 2026.
