255 people waited more than a year to be admitted at Milton Keynes University Hospital
Of those, 25 patients waited more than 18 months, figures show
Hundreds of people waited more than a year to be admitted for treatment at Milton Keynes University Hospital, figures show.
Charities have called on the NHS to do more to support patients awaiting treatment as health services work "flat out" to reduce waiting lists made lengthier by the impact of the coronavirus pandemic.
NHS digital statistics show around 255 patients needing non-emergency care at Milton Keynes University Hospital had waited more than a year in the year to March following the initial decision to admit them.
Of those, 25 waited more than 18 months.
Nationally, more than 95,000 patients admitted for non-urgent treatment across England in 2020-21 had been waiting for more than a year, up from around 42,000 the year before.
The figures do not include planned admissions where there is a personal or medical reason behind a delay.
The Patients Association charity said patients should be given "honest timescales" for treatment and advice, support and compassion during their time on waiting lists.
Chief executive, Rachel Power, said: "The NHS must understand the impact on patients when planned care is cancelled or when you've no clear idea of when you may get care, and act in response.
"This means clear communication to patients and giving clear expectations about what might happen next.
"We know it will take many months before the waiting lists come down, but until they do, patients waiting must be supported and not left to wonder about what may happen to them."
Sir Robert Francis, chairman of Healthwatch England, said patients needed clear and individualised information about the next steps in their treatment.
He said an emphasis on interim care like physiotherapy, pain relief and mental health support could make the waiting experience more bearable and prepare people for surgery.
Sir Francis added: “With healthcare services forced to prioritise critically ill patients throughout the pandemic, it is a reality that people will be waiting longer for hospital treatment for a while.
“However, NHS England must manage waiting lists better by reducing the risks and inconvenience to patients caused by delays to care, as part of the national action to reduce the backlog."
A spokeswoman for the NHS said caring for 450,000 Covid-19 patients in hospital had had an inevitable impact on the health service's ability to deliver care for less urgent conditions.
She said patients awaiting treatment had been reviewed by clinicians and were supported while on the waiting list, adding: "NHS services have continued to be available for patients who needed them and staff are currently working flat out to get services back to pre-Covid levels.
"This week the NHS laid out its plan for the next six months, which includes £1.5billion of funding to support the continued recovery of waiting lists and cancer services.”