C031700 Filed November 29, 1999 Certified for Publication ORIGINAL PROCEEDING: Petition for Writ of Review, No. STK92070 Boehm Associates, Robert Feinglass and Nancy Roberts for Petitioners. David Bryan Leonard for California Society of Industrial Medicine Surgery, Inc., as Amicus Curiae on behalf of Petitioners. Richard A. Krimen, Robert W. Daneri and Don E. Clark for Respondents. NICHOLSON, J. Pursuant to Labor Code section 4603.2, subdivision (b), interest accrues on unpaid bills for compensable