It is common for health care providers to move in and out of different health plan networks, making it difficult for your doctor to know what providers are in your network. If your doctor refers you to another health care provider, it's up to you to see if the provider is in your network. To see if a health care provider is in your network, review your plan information, visit your insurance company's website or call your insurance company with questions. Even if the provider you want to see is listed on the carrier's site, don't stop there. Sometimes information on a carrier's look-up tool is outdated. Contact the provider's office directly to confirm your plan will be accepted.