The single greatest drawback of a Health Maintenance Organization (HMO) health insurance plan is its strict network limitation and the complete lack of coverage for out-of-network medical care, except in genuine life-threatening emergencies. HMO members are strictly required to receive medical treatment exclusively from doctors and facilities belonging to the plan's contracted network. Furthermore, patients must select a primary care physician (PCP) and obtain formal medical referrals from that PCP before they can see any medical specialist, creating administrative hurdles and restricting patient freedom of choice.
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