"It is important to acknowledge the efforts of our staff and our proactive approach to complaints management," he said.
One of Whanganui's complaints was regarding a lack of access to mental health services and the other involved inadequate follow-up after surgery, however, both complaints were resolved.
The findings show nationally numbers of complaints to the Commissioner jumped up 40 per cent over the last five years, but Hill said there was no evidence to suggest the increase was due to a drop in service quality at DHBs.
"The growth in complaint numbers is likely due to the increasing profile of the Health and Disability Commissioner, the improved accessibility of complaints processes due to advancing technology, and an increasing public knowledge of consumer rights."
Hill said the figures were consistent with a trend seen by other complaint agencies in New Zealand and abroad.