Richard Haynes, spokesman for Worcestershire Acute Hospitals, argued that the parking charges meant Government money could be used on clinical care instead.
He said: "If we didn't cover the expenses of providing safe parking through charges, then where else would that money come from?
"If patients and visitors didn't pay for their parking that money would have to come from front-line services and patient care.
"This is hardly trusts taking money off patients for nothing."
Phil Milligan, managing director of Good Hope Hospital NHS Trust -which earned £800,000 in parking revenue last year - said the trust was actually a victim of its own success.
He said: "Our relatively high income per space may be a reflection of a restricted number of spaces as more and more patients come to Good Hope for their treatment.
"We have been reviewing how we provide parking and intend to increase the number of visitor spaces we provide.
"In its report, the select committee makes clear that it is keen for hospitals to help people on low incomes.
"We have the same concern which is why we are also planning to introduce free parking for all visitors on low incomes."