DME Coding

“I billed A5500 and A5512 with modifiers -KX, -RT, -LT. L1940 KXRTLT L2330 KXRTLT L2820 KXRTLT I billed these on separate lines. This claim was rejected so we re-billed putting the KX modifier in the 3rd spot and it was still rejected for the same reason. The comment was: 4 – the procedure code is inconsistent with the modifier used or a required modifier is missing Any thoughts on how to tackle this denial?”