Managed care organizations are integrated entities in the healthcare system, which endeavor to reduce costs associated with healthcare expenditures.[1] Since the 1970s, managed care organizations have shaped healthcare delivery in the United States through preventative medicine strategies, financial provisioning, and treatment guidelines.[2] 

The Health Maintenance Organization Act of 1973, an amendment of the Public Health Service Act of 1944, established the foundation for managed care organizations and their comprehensive cost-saving methods.[3] Managed care organizations are essential for providers to understand as their policies can dictate many aspects in the delivery of health care; provider networks, medication formularies, utilization management, and financial incentives influence how and where a patient receives their medical care.[4]

Managed care organizations are present in many iterations, most commonly as health maintenance organizations (HMOs), preferred provider organizations (PPOs), and point of service (POS) organizations. Differentiation between the abovementioned structures can be difficult may require further investigation for providers and patients to comprehend fully. The notable points of each are as follows:

• Health Maintenance Organizations (HMOs): A patient chooses an in-network primary care provider, who is responsible for referrals to specialists. The insurance typically pays only in-network providers and is generally the cheapest option.
• Preferred Provider Organizations (PPOs): Patients can choose from a list of in-network providers for primary and specialty care. Patients can also see out of network providers but will incur a higher cost than in-network counterparts. Additionally, patients can typically see in-network specialty providers without a referral. Prices tend to be higher due to increased flexibility.
• Point of Service (POS) Organizations: Point of service organizations are a cross between HMO and PPOs, which require a PCP but allows patients to see in-network specialists without referrals. The cost is typically between HMO sand PPOs.
• Exclusive Provider Organizations (EPO): EPOs allow patients to choose their in-network providers without the need for establishing a primary care provider and receiving referrals. However, all out of network expenses are not covered. 

Insurances allow for out-of-network emergency medical attention to be administered, as the patient cannot reasonably choose providers in an emergency setting. Financial coverage for medically necessary emergency visits may depend on admission status, network status, and treatments administered.

Managed care organizations influence healthcare in all aspects of delivery. Managed care organizations have shown to improve outcomes, which has contributed to their expansion.[5][6][7][8] Provider networks influence the choice of primary care provider and may limit the ability to see specialty providers, depending on the plan’s requirements. Imposed regulations by the organization also impact preventative care measures and preferred treatment methods, including medication formularies, which, by design, reduce overall expenditure.[1][9] Together, these regulations implore to reduce healthcare expenditures by providing cost-effective management.[10] This cost-effective management can be implemented as a long-term patient care plan or on the backdrop of public health.[11][12]

Provider reimbursement also significantly affects healthcare utilization.[13] As managed care organizations provide financial incentives for worthwhile ventures, providers will be more likely to follow the intended goals of each program. Furthermore, cost-sharing measures such as capitation cause the provider to incur a financial stake in healthcare cost utilization, which may influence treatment plans.

Interprofessional teams need to understand the premise of managed care organizations and how they affect healthcare delivery.[14] As a business, providers must be able to balance expenditures, prudent treatment, and reimbursements to continue providing healthcare at a reasonable cost. Furthermore, interdisciplinary teams should understand how their treatment plans may be altered by managed care organizations and the effect of alteration on outcomes.[15] Through comprehension of the impact of managed care organizations, interdisciplinary teams can assist providers in the delivery of prudent and cost-effective care.