Most health plans, including plans available through the Health Insurance Marketplace, must cover a set of preventive services such as shots or vaccines, and screening tests at no cost to you only when they are delivered by a provider in your plan’s network. Using you’ll see many common recommendations such as diet counseling, depression screening, blood pressure screening, and a long list of immunization vaccines to prevent measles, the flu, and mumps, and more. Recommendations vary based on age, sex, family history, and other reasons.