Foreign patients receiving medical treatment in Wanganui owe more than $20,000.
According to figures released to the Wanganui Chronicle under the Official Information Act, 76 foreign patients owed a total of $20,670 in unpaid medical bills at the end of last year.
In 2013, 48 debtors owed $40,745 and in 2012, 20 debtors owed $46,958.
A Whanganui District Health Board spokeswoman said officials were "proactive in chasing any and all outstanding debt".
"If a non-resident doesn't pay, we follow up by phone calls and emails," she said. "Most of the problem ones are those that are living in New Zealand without insurance, so they go to debt collection if required."