Fears are being raised that the NHS in England will no longer be free at the point of use within 10 years.
Nearly half of the 78 health and care leaders surveyed by the Nuffield Trust felt the status quo would not remain because of the squeeze on funding.
The think tank warned of a "funding crisis this year or next" and that patient care could start to suffer.
The government called this an "unrealistic picture", but Labour said NHS finances were in a "dire state".
Currently the health service gets just over £100bn a year
http://www.bbc.co.uk/news/health-28235850