This paper reports on a project to improve the comparability and availability of private health expenditure under the joint health accounts questionnaire (JHAQ) data collection. The JHAQ is a framework for joint data collection in the area of health expenditure data developed by OECD, Eurostat, and WHO. In particular, the study questions were: How to overcome the inherent tendency for much private health care financing to occur without the generation of linked, reliable, and comprehensive routine data? How to tackle the issue of private providers likely to operate without reporting of routine data to statistical agencies?