Section 43.07. Bill collection procedures

(a)  The  commissioner may enter into agreements with the patient or a
  person liable for him pursuant to this chapter  to  assure  the  regular
  payment of fees.
    (b)  The  commissioner may collect bills not paid within sixty days of
  presentment or pursuant to agreement by the enforcement  of  liens,  the
  initiation of suit against liable parties to recover amounts due, or the
  initiation of suit to enforce an agreement.
    (c)  An  action  to  collect  fees  due pursuant to this chapter shall
  commence within six years from the accrual of the cause of action.  This
  cause of action accrues when the fees become due.