The Banbury MP has called for new measures to protect smaller hospitals.
Last Monday, Horton hospital directors voted in favour of keeping maternity and children's services rather than moving the bulk of the wards to Oxford.
Conservative Tony Baldry told the Commons he wanted smaller hospitals to be allowed to form alliances to support each other in the future.
He added: "Such hospitals usually have a particular purpose in serving a significant community."
Mr Baldry also praised those involved in a seven-year campaign to keep key services in Banbury.
"All the many thousands who have taken part, in whatever way - by petitioning, writing letters, offering professional advice, or just being there - can take pride in what we have achieved," he said.
But he warned ministers that "much of the story of Horton hospital is yet to be written".
"Let me be very clear - as far as I am concerned, the well-being and welfare of Horton hospital will always be unfinished business," he added.