“Person with a disability” means a person unable to engage in any substantial gainful activity by reason of a medically determinable physical or mental impairment which can be expected to result in death or has lasted or can be expected to last for a continuous period of not less than 12 months. Persons with disabilities filing claims under this Act shall submit proof of the disability in such form and manner as the Department shall by rule and regulation prescribe. Proof that a claimant is eligible to receive disability benefits under the Federal Social Security Act shall constitute proof of the disability for purposes of this Act. Issuance of an Illinois Person with a Disability Identification Card stating that the claimant is under a Class 2 disability, as defined in Section 4A of the Illinois Identification Card Act, shall constitute proof that the person named thereon is a person with a disability for purposes of this Act. A person with a disability not covered under the Federal Social Security Act and not presenting a Disabled Person Identification Card stating that the claimant is under a Class 2 disability shall be examined by a physician designated by the Department, and his status as a person with a disability determined using the same standards as used by the Social Security Administration. The costs of any required examination shall be borne by the claimant.