Ben Summerskill, chief executive Stonewall, referred to a recent report by his organisation listing the top 100 gay-friendly UK employers.
Only two NHS bodies were listed and Mr Summerskill raised concerns about homophobia.
"We heard from a gay Filipino man who worked as a staff nurse in a London hospital", he said, the level of disrespect was worse than anything he had experienced, including working for three years as an openly gay man in Saudi Arabia, he said.
We heard from a woman who went into hospital to have a finger reattached. While this operation went on, she had to listen to a tirade of homophobic abuse from the surgeon."