Wiki Billing crutches E0114

Townsend, WI
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I'm looking for any insight on how to correct a claim from Humana Medicare Insurance for a patient who came to our clinic for knee pain and had an x-ray of his left knee and was given a pair of crutches. We coded the crutches using HCPCs code E0114 and appended modifier NU. That part of the claim was denied stating invalid place of service. The insurance company was called and they asked where the product was going to be used and I stated the patient's home. The insurance company representative said then that needs to be noted on the claim. Does anyone know where this should be indicated and what code we would use.

Thank you,