Any physician assistant who notifies the Board in writing on forms prescribed by the Board may elect to place his license on an inactive status. A physician assistant with an inactive license is excused from payment of renewal fees and may not practice as a physician assistant. Any person who engages in practice as a physician assistant while his license is lapsed or on inactive status is considered to be practicing without a license, which is ground for discipline under section 50n. A physician assistant requesting restoration from inactive status shall pay a renewal fee and shall meet the criteria for renewal as specified in section 50f.