"The United Kingdom submitted on 29 March 2017 the notification of its intention to withdraw from the Union pursuant to Article 50 of the Treaty on European Union".
Instead of determining an annual budget each year, she said, a multi-year funding arrangement will be agreed so health chiefs have more certainty and stability from year to year.
May also dodged the question when asked past year.
Mrs May also set out a vision of economic prosperity at home, and influence overseas, trading freely with friends and partners across Europe and beyond.
Addressing voters, she said the UK "will thrive as a strong and united country that works for everyone, no matter whether you voted Leave or Remain".
The British Prime Minister Theresa May will embark on a daylong tour across the United Kingdom to mark "Brexit Day" - a year the country is scheduled to depart the European Union. I am determined that as we leave the EU, and in the years ahead, we will strengthen the bonds that unite us, because our is the world's most successful union.
After starting her four-nation tour at a textile factory in Ayrshire, the PM said: "Let's be clear, there is no power-grab; we are not taking back any of the powers that are now devolved to the Scottish Government, indeed the Scottish Government will be receiving more powers as a result of us leaving the European Union".
On Thursday, Mrs May will visit a textile factory in Ayrshire, a parent and toddler group in Newcastle, have lunch with farmers near Belfast before meeting businesses in Barry, south Wales. To fail to provide them with the education and support they need will short-change the nation in the long term.
"I always say to people the likelihood is it happens, but it doesn't have to happen, and the first place that's going to decide it is Parliament and MPs should vote according to their conscience", he said.
During the campaign for the 2016 referendum, Brexit supporters had said that Britain pays £350m a week to the bloc, and had promised to spend the money on the NHS instead.
Labour has been scrambling to clarify its position on Brexit after Shadow Foreign Secretary Emily Thornberry suggested the party would back the deal May negotiates with Brussels.
She confirmed that she wanted a bespoke trading deal with the European Union, unlike any other deal it has signed with other non-EU countries.
The UK will benefit from a so-called Brexit dividend which is likely to be in the region of £10bn a year, Andrea Leadsom has told LBC.