The Medicare Administrative Contractor for Jurisdiction B, National Government Services, will require suppliers to include a narrative explanation, effective Feb. 1, when submitting claims for test strips for a noninsulin treated diabetic beneficiary (KS modifier) in quantities of 10 or more units of service. The DME MAC reported that it is implementing the change because of a high volume of claims for diabetic test strips (A4253KS) with an incorrect number of services.