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HMO plans, or Health Maintenance Organization plans, typically require referrals for members to see specialists. This referral process is a key feature of HMO plans, as it encourages members to work closely with a primary care physician (PCP) who coordinates their overall care. The PCP acts as a gatekeeper, managing and directing patient care, which helps control costs and ensures that care is appropriate and necessary.

In an HMO, the requirement for referrals can lead to a more coordinated approach to healthcare because it compels patients to seek advice and direction from their primary care doctor before seeing a specialist. This system is designed to prioritize preventive care and manage the overall treatment plan effectively, reducing the likelihood of unnecessary tests or procedures.

The referral requirement is one of the distinct characteristics that sets HMO plans apart from other types of plans, such as PPOs (Preferred Provider Organizations), where patients often have more freedom to see specialists without needing a referral. Understanding this aspect is vital for navigating healthcare options and making informed decisions about primary care and specialist visits.