Section 221.4-B - Calculation of RBC(a) A health organization's RBC shall be determined in accordance with the formula set forth in the RBC instructions.(b) The formula shall use and may adjust for the covariance between the following risks determined in each case by applying the factors in the RBC instructions: (4) All business and other risks set forth in the RBC instructions.1921, May 17, P.L. 789, No. 285, § 221.4-B, added 2000, June 22, P.L. 457, No. 62, § 1, imd. effective.