What does denial code OA 16 mean? Option A Indicates the impact of prior payers(s) adjudication, including payments and/or adjustments. Option B More than one claim has been submitted for the same item or service(s) provided to the same beneficiary on the same date(s) of service. Option C Claim/service lacks information or has submission/billing error(s) which is needed for adjudication Option D Payment adjusted because the payer deems the information submitted does not support this many/frequency of services