Many HMOs offer an indemnity-type option known as a POS plan. The primary care doctors in a POS plan usually make referrals to other providers in the plan. But in a POS plan, members can refer themselves outside the plan and still get some coverage.
If the doctor makes a referral out of the network, the plan pays all or most of the bill. If you refer yourself to a provider outside the network and the service is covered by the plan, you will have to pay coinsurance