Which of the following is not among the four major insurance plan types?

• A. PPO
• B. HMO
• C. HDHP
• D. POS

Answer: (D)

The key idea here is how insurance plan types are categorized. In many health insurance overviews, the four major plan types you’re typically taught are HMO, PPO, EPO, and HDHP. A POS plan, Point of Service, is a hybrid that blends features of HMO and PPO. Because it’s viewed as a variant or hybrid rather than a distinct major category, it isn’t always listed as one of the four primary plan types. That’s why POS is the correct choice for “not among the four major insurance plan types.” To anchor this, remember how these compare: HMO emphasizes in-network care with a primary care physician; PPO offers more flexibility and out-of-network options (at a higher cost); EPO is like a PPO with no out-of-network coverage; HDHP features high deductibles often paired with an HSA. POS sits between HMO and PPO in practice, which is why it’s treated as a hybrid rather than one of the four main types.