It seems that you have denial of code L3020 due to missing modifiers. If that is the case, I will suggest as follows:
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When billing for a shoe that is an integral part of a leg brace or for related modifications, inserts, heel/sole replacements or shoe transfer, a KX modifier must be added to the code. If the shoe or related item is not an integral part of a leg brace, the KX modifier must not be used.
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If the shoe and related modifications, inserts, and heel/sole replacements are not an integral part of a brace, the GY modifier must be added to each code.
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If a KX or GY modifier is not included on the claim line, it will be rejected as missing information.
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When billing for prosthetic shoes and related items, an ICD-9 diagnosis code (specific to the 5th digit), describing the condition which necessitates the prosthetic shoes, must be included on each claim for the prosthetic shoes and related items.