Nursing minister Anne Milton lost her job in the Cabinet reshuffle.
The former nurse has been a parliamentary under-secretary of state for health since the general election in 2010. Her portfolio included nursing and public health.
In the reshuffle, which saw health secretary Andrew Lansley replaced by former culture secretary Jeremy Hunt, former journalist Anna Soubry was appointed under-secretary of state for health.
However, portfolios for new ministers have not yet been agreed so it is not clear who will take on responsibility for nursing in the new Department of Health ministerial team.
Earl Howe was the only DH minster to keep his job in the shake-up.
Mr Lansley will become leader of the House of Commons while health minister Simon Burns was promoted to transport minister. He is expected to be replaced by Dan Poulter, a qualified doctor.
No new role has so far been announced for Ms Milton.
Care services minister Paul Burstow, a Liberal Democrat who is fighting plans to close an accident and emergency department in his south London constituency, also left the government. He has been replaced by party colleague Norman Lamb.