An attachment/other documentation is required to adjudicate this claim/service

Why this happens on dental claims

• Crowns, buildups, and scaling and root planing submitted without the pre-operative radiographs and periodontal charting the payer requires by policy
• Electronic attachments that failed to transmit or were never linked by the payer's attachment vendor
• Narrative requirements for by-report services and unusual-circumstance codes

How to appeal CO-252

1. Identify the exact requirement from the remark codes or the payer's published attachment grid
2. Gather diagnostic-quality images, dated charting, and a specific narrative from the treating dentist
3. Resubmit with attachments through the payer's designated channel and record the attachment reference number
4. Follow up in two to three weeks to confirm the attachment linked to the claim
5. Escalate to a formal appeal with the full package if the payer denies again while holding the documentation

How to prevent it

• Maintain a payer attachment grid by CDT code and send required documentation with the first submission
• Verify attachment transmission reports the same day claims go out