A startup is trying to shake up health insurance by letting customers buy some of their coverage only when they need it.

Bind Benefits has designed insurance that gives patients coverage for most medical needs and then has them buy additional protection for planned procedures like knee surgery.

Bind also pushes patients to think more about where they get care and dumps confusing payments like deductibles in an attempt to give a better idea of what something actually costs.

This on-demand approach to insurance is one of the latest wrinkles in a yearslong push by companies and insurers to control costs and make patients smarter health care shoppers. Bind has started small, but its coverage has already drawn attention from the nation's largest insurer, UnitedHealthcare, and some sizeable employers.

Copyright 2018 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.