This is the Phase 3 of a 3 phase study to determine the feasibility, acceptability and effectiveness of a health microinsurance scheme in improving health equity and clinical outcomes for private primary care (PPC) in Kuala Lumpur, Malaysia. This two-arm, pre-post, quasi-experimental trial consisted of utilizing a HMI scheme (experimental clinic) and normal OOP payments (control clinic) for 6 months. The HMI scheme enabled subscribed households to access a defined benefit package at a selected PPC for treatment and follow-up.