Today's extra day in February has caused the payment system used by the health industry to crash, preventing 150,000 customers from using private health care cards for medical transactions.

National Australia Bank-owned Health Industry Claims and Payments Service (HICAPS) warned customers they may encounter troubles with the terminals used at medical and insurance offices today.

Medical payments may be more difficult today.

“Due to a software issue you may be experiencing difficulty with your terminal today,” the company said.

The HICAPS failure follows problems at Commonwealth Bank, which saw its ATMs and eftpos systems fail earlier today.