Foreigners owe around $72,000 in outstanding medical bills to Wairarapa Hospital.
Ineligible for public health care, many visitors to New Zealand must pay for health care they receive.
The total cost in 2012-13 of treating foreign patients was $87,532 but to date most of it - $72,503 - has not been paid back.
The figures in a chief executive's report to the Wairarapa District Health Board were revealed under the Official Information Act.
Over the past two years, 18 patients from around the globe were admitted to hospital, often in an emergency.