Vroon says the grant will go towards the salary of one of the hospice's three doctors, enabling the hospice to provide specialist medical care.
"That is something that is absolutely critical to us being able to provide a quality ongoing service to patients at the end of life."
NZCT spokeswoman Tanya Piejus said the trust has awarded the hospice thousands of dollars to support staff salaries over previous years.
"Approximately 50 per cent of NZCT's grants go towards salary support because we know how hard it is for charitable organisations to find reliable and consistent funding streams to pay staff," she said.
"We're a long-time supporter of Hospice Whanganui."
Also awarded a grant was the Whanganui Community Sports Centre, another frequent recipient of NZCT funding.
The group received $10,000 to fund the re-dress of the Springvale stadium floor.
Manager Alan Kenny said the funding was "very significant" for the organisation.
"Our floors are our biggest asset. It allows us to attract tournaments from around the country," Kenny said.
"For us the impact on the community is quite huge. We've attracted big tournaments to the city, so the impact on the community economically is huge.
"We take our hat off to the trust. They've saved us a hell of a lot of money going forward."
Full list of Whanganui NZCT grant recipients
Hospice Whanganui - $20,000 for staff salaries.
Mosston Primary School - $9999 for a safety surface.
Rivercity Squash Club - $10,000 to repair and resurface carpark.
Whanganui Community Sports Centre - $10,000 to re-dress flooring.