OA-164: Attachment/Documentation Not Received Timely

What Does OA-164 Mean?

OA-164 is uncommon and typically appears when the documentation timeliness issue involves coordination between multiple parties. For example, if a secondary payer needed documentation from the primary payer's adjudication and that information was not available within the deadline, the OA group code reflects an administrative coordination gap rather than a strict contractual obligation.

When CARC 164 appears on a remittance, the payer is telling you that the required supporting documentation referenced on the claim — medical records, operative notes, test results, authorization letters, or other attachments — was not received within the payer's specified time limit. The payer may have eventually received the documents, but they arrived after the window for acceptance had closed.

CARC 164 is distinct from CARC 163, which indicates documentation was never received at all. With CARC 164, the payer is specifically flagging a deadline violation. Most payers set documentation submission deadlines ranging from 30 to 90 days from the date of the initial request or claim submission. Some payers enforce these deadlines strictly, while others may allow exceptions for demonstrated good cause.

The root causes are typically operational: internal workflow bottlenecks that delayed the gathering of records, unawareness of the specific payer's deadline, failed or delayed electronic or fax transmissions, or documentation requests that were missed entirely and discovered only after the deadline passed. In many practices, CARC 164 denials are preventable with better tracking systems and internal deadline management. The financial impact is significant because these denials often represent fully approvable claims that simply missed an administrative deadline.

How to Resolve

Submit the documentation immediately, explain the delay, and appeal if extenuating circumstances prevented timely delivery.

1. Identify the coordination issue Determine whether the delayed documentation relates to cross-payer coordination, such as primary payer EOB information needed by the secondary payer.
2. Obtain and submit the required documentation Gather the necessary information from the relevant party and submit it to the payer with the claim reference and an explanation of the coordination delay.
3. Request reprocessing with explanation Ask the payer to reprocess the claim, explaining that the delay was caused by cross-payer coordination and was outside the provider's direct control.

How to Prevent OA-164

• Ensure primary payer adjudication documents are obtained promptly after primary claim resolution
• Track coordination-dependent claims separately and escalate when primary payer responses are delayed
• Proactively communicate with secondary payers about expected delays in cross-payer documentation

Also Filed As

The same CARC 164 may appear with different Group Codes:

Related Denial Codes