PDFWAC 182-540-180
Laboratory services.
(1) Laboratory services included in the composite rate, performed by either the facility or an independent laboratory, must not be billed separately except as provided for in (b) of this subsection:
(a) Standard end-stage renal disease (ESRD) lab tests are included in the composite rate when performed at recommended intervals (see billing instructions for current list).
(b) The standard ESRD lab tests referred to in (a) of this subsection can be reimbursed separately from the composite rate only when it is medically necessary to test more frequently:
(i) Proof of medical necessity must be documented in the client's medical record when billing for more frequent testing. A diagnosis of end-stage renal disease is not sufficient;
(ii) The claim must include information on the nature of the illness or injury (diagnosis, complaint or symptom) requiring the performance of the test(s); or
(iii) An ICD-9CM diagnosis code may be shown in lieu of a narrative description.
(2) All separately billable, ESRD laboratory services must be billed by and reimbursed to the lab that performs the test.