Section 4. Section 6 of the same Act is hereby amended to read as follows:

"SEC. 6. Mandatory Coverage. — All citizens of the Philippines shall be covered by the National Health Insurance Program. In accordance with the principles of universality and compulsory coverage enunciated in Section 2(b) and 2(l) hereof, implementation of the Program shall ensure sustainability of coverage and continuous enhancement of the quality of service: Provided, That the Program shall be compulsory in all provinces, cities and municipalities nationwide, notwithstanding the existence of LGU-based health insurance programs: Provided, further, That the Corporation, Department of Health (DOH), local government units (LGUs), and other agencies including nongovernmental organizations (NGOs) and other national government agencies (NGAs) shall ensure that members in such localities shall have access to quality and cost-effective health care services."