Computation of surcharge when professional liability insurance premium part of a composite rate.

(a) Where the professional liability insurance premium of an insured is included in a composite rate or with other insurance coverage, it shall be the responsibility of the insurer to accurately compute the portion attributable to the professional liability insurance, in order to properly determine the surcharge.

(b) Premiums subject to rating adjustments or audits, or both, shall be recomputed at the time of the adjustment or audit to determine the gross premium to which the surcharge is applicable.