A worker is not liable to pay, and a person is not entitled to recover from a worker, any amount in respect of medical or related treatment, hospital treatment at a hospital or a workplace rehabilitation service, given or provided to the worker as a result of an injury, to the extent that the amount exceeds any applicable maximum, as follows--
(a) in the case of a medical or related treatment for which a sum is fixed under section 61 (2), the applicable maximum is that fixed sum,
(b) in the case of hospital treatment at a hospital, the applicable maximum is the amount calculated as fixed under section 62 (1) as the cost to the hospital of the treatment,
(c) in the case of a workplace rehabilitation service for which a sum is fixed under section 63A (2), the applicable maximum is that fixed sum.