OBJECTIVES: Hypertension is ranked as the 4th leading cause of morbidity in the Philippines, and as such, it greatly contributes to the increasing health expenditures of the country.  The Philippine Health Insurance Corporation (PhilHealth), the mandated provider of social health insurance in the country, currently only has an inpatient benefits package system for hypertension, causing many members and beneficiaries to avail of this rather than more cost-effective outpatient maintenance treatments.  This study explores the possibility of contributing to the formulation of an outpatient benefits package for PhilHealth by probing into the willingness to pay of patients for anti-hypertensive healthcare.   METHODS: An Ordinary Least Squares regression model with a log-transformed outcome variable to measure WTP was specified using various socio-economic, demographic, and health status data from PhilHealth Member Surveys. A contingent valuation approach was elicited to measure the level of WTP among respondents. An asset valuation method also complements the WTP analysis to assess ability to pay. RESULTS: Mean WTP was significantly (p = 0.01) associated with asset ownership, which was used as a proxy variable for long-term wealth. The adjusted mean WTP amounted to $3.3 per month for anti-hypertensive medicines. WTP was also observed to be significantly higher for non-paying retirees and indigent members, which are the two most vulnerable groups in the population. CONCLUSIONS: Based on the results of the study, it is deemed necessary for PhilHealth to enhance safety nets for vulnerable groups and employ cost-effective measures through an outpatient benefit package for hypertension. WTP analysis, as a preference measure, is a helpful tool in determining the economic value of medical treatments to PhilHealth beneficiaries and provide basis for costing the rate of premiums for outpatient benefit packages.