[ 481E-6]  Suspension, revocation, or refusal to renew registration.  (a)  The director may suspend, revoke, or refuse to renew a registration for conduct that would have justified denial of registration under section 481E-5(b).

     (b)  The director may deny, suspend, revoke, or refuse to renew a certificate of registration or licensure only after proper notice and an opportunity for a hearing pursuant to chapter 91.