The workers are said to have been carrying out band three tasks, while on band two pay, in recent years.
Band two tasks include feeding, bathing and toileting patients, as well as some documentation, while band three workers are expected to carry out more clinical observations, such as monitoring heart rate, blood pressure, wounds and urine analysis.
One Worcestershire support worker, who asked not to be named, said the issue had been going on for some time now.
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It has now culminated in a series of demands being made by UNISON.
After Worcestershire Acute Hospitals Trust offered a one-off £4,000 or £2,000 pro-rata back payment to affected healthcare assistants, the union requested this be increased.
This request was reportedly supported by more than 400 emails from staff to the trust’s acting CEO Stephen Collman.
In a response, seen by the Worcester News, Mr Collman said the payment was the trust’s “final offer”.
“The backpay recognition proposal submitted to UNISON was our final offer,” he said.
“We cannot agree to the request outlined in the letters to increase this beyond the £2,000/£4,000 offered.
“I understand that this may be disappointing, but please know that this decision comes from a place of wanting to maintain equity and fairness for all staff.”
The healthcare support worker, who spoke to Worcester News, said: “We are all feeling really disappointed and not appreciated by the trust.”
UNISON said it may now consider strike action if a “fair deal” is not reached.
UNISON West Midlands regional head of health, Chanel Camileri-Willis said: “Healthcare assistants in Worcestershire deserve to be paid fairly for the work they do.
“For years, staff have been carrying out clinical tasks that demand skills and expertise beyond the normal duties of their NHS wage rate.
“The trust should move employees on to the correct grade and provide back pay for the extra work they’ve already done.
“If the trust fails to offer a fair deal, staff will be consulted about next steps including possible strike action.”
Ali Koeltgen, Chief People Officer at Worcestershire Acute Hospitals NHS Trust said: “Our health care support workers carry out a vital role in our hospitals , their work makes a huge difference to our patients and the care they receive.
“We continue to work closely with UNISON and other trade union partners to ensure that our band 2 healthcare support workers are paid fairly for the important work they do, in line with national guidance.
“Our trade union partners are currently engaging with their members regarding our most recent proposals to increase pay and we look forward to receiving a response soon.”