Medicare Denied CPT code 92588

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I am new to ENT billing. I am getting denials from Medicare for CPT codes 92588,92504,92550, 92553, 92557, 92567. Denial states procedure code is inconsistent with modifier used or a required modifier is missing. I added modifier 51 to all after the first modifier was billed. Here is what my claim looked like 99213-25, 92557, 92588-51, 92504-51, and 92550-51. Should I leave the modifier off? Or is modifier 59 the appropriate modifier? Any help would be appreciated. Thanks

Medicare Denied CPT code 92588