The top earning GP practice under the medical card scheme made nearly 1.3 million euro last year.
It's run by Dr Anas Mansour, who has a surgery in north-west Dublin.
Four others got over 1 million - and the average payment to over 2,900 practices was 263,000 euro.
But Donegal GP Ciarán Ó Fearraigh says the medical card scheme isn't as lucrative as it appears.
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