Regardless of what you read online… as of this writing (please check the date of my post!), there is only one EASY way of knowing what your PhilHealth ID Number is without access to your PhilHealth ID (if you have lost it or left it at home and need your number for any reason at all):
DIAL 441-7442
From the province: (02)-441-7442
This is PhilHealth’s Official Call Center.