Healthcare New Zealand is investigating how confidential client documents ended up on a suburban street in Christchurch.
The records were discovered by a member of the public, after they and a number of other items were stolen from a staff member's car.
The documents have since been returned.
Healthcare New Zealand is the country's largest provider of community-based health and disability support.
Spokesman Scott Arrol doesn't believe the information has been compromised, but nevertheless, it's crucial that clients involved are informed.