Hospitals in the Philippines are mostly run as a business and when dealing with one you must keep that in mind. If you need treatment in a public or private hospital then be prepared to pay there and then. Even if you think you have the correct insurance it is very likely you will have to pay upfront.
Hospitals in Manila range from fantastic to absolute squalor. It is impossible to advise people of just how bad some of the hospitals are. One of the things to remember here is that you are expected to have a helper with you at all times whilst you are in hospital. It is the helpers that must go and BUY your drugs. After the initial treatment drugs do not automatically arrive at your room they have to be purchased. Now dependent on your insurance or credit card that may or not be a problem.
Foreign patients in the more public hospitals may be expected to make a higher contribution to their treatment.
If you are travelling around Manila here is a list of some of the hospitals that can assist you. Keep it safe guys.
Read the Wikipedia article of PGH.
Read the Wikipedia article of Tondo Medical Center.
Perpetual Succor Hospital & Maternity, Inc.