Freelancer chief executive Matt Barrie is among the technology executives, engineers and academics who say they won't be using the federal government's My Health Record, citing privacy concerns ahead of Thursday's deadline to opt out of the system.

My Health Record is an online summary of an individual's health records, stored in a centralised database managed by the government. Its proponents say it gives patients greater mobility and the health system a richer information base on which to craft public policy, but its implementation has been dogged by privacy concerns.