Discriminatory expectations were being placed on carers of the intellectually disabled which were not placed on other members of the public seeking health treatment, he said.
He cited instances where it was expected the intellectually disabled should have support of aides provided by residential carers while in hospital.
The organisation he chaired, Hawksbury Community Living Trust, had been prepared to provide such support to its residents, but not every provider would be able to do that, he said.
There were other times when patients were turned away from hospital because there was an inability to resolve issues of informed patient consent in a sensible way.
The uneven provision of funding for equipment for the disabled was also a problem, with people seeking aids during the second half of the financial year often being "out of luck".
His comments came at yesterday's board meeting during consideration of the draft strategy on access to health care for the intellectually disabled.
Mr Thomson declared an interest and vacated the chair during the discussion, but the board agreed he should be allowed to speak.
He said he was uncomfortable with the emphasis on disability awareness training in the document's action plan, suggesting that if there had been consultation with providers during the strategy preparation, the need for practical solutions might have been given more prominence.
The only actions suggested in the plan involved disability awareness training.
Board member Louise Carr, who is chief executive of residential provider Pact, also declared an interest, and agreed her organisation had had similar experiences.
The board approved the strategy, with its four goals relating to equitable access, treatment involving a continuing care approach, training and support for those workers in contact with the intellectually disabled and the provision of health information suited to people with intellectual disabilities and their families.
It was also agreed the board management should consider the action plan further in consultation with health providers.
