That's up from 713 in the week ending August 27.
In the same time period, COVID-19 cases declined from 438 to 386, and flu cases from 2250 to 1424.
But Today health expert Dr Nick Coatsworth sought to play down worries about a new viral surge.
"It's not dangerous, but it has a long name," he said.
He said HMPV was one of the viruses that made up the common cold.
"If I can reassure people out there, we'd get it every year or second year," he said.
"I know there's a spike in cases (but) I reckon we've become a little too obsessed about the sort of viruses that are circulating."
The latest COVID-19 strain spreading across the world
"We're not only seeing increased numbers, but we're also seeing people who we typically would think have a mild illness tending to have a more severe illness," he said.
Symptoms include cough, fever, nasal congestion, and shortness of breath, and the virus is understood to be most active in late winter and spring.
There is no specific medication or vaccine available for it.
