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The claim says G89.29. The diagnosis is chronic pain. Everything looks straightforward until someone asks the question that actually matters: why was the patient here? This FY 2027 guide walks coders and billing teams through G89.29 vs. G89.4, sequencing, site-specific pain codes, documentation red flags, and five self-check tools to trace a claim from note to payment.

Stop fixing the same denials over and over. Identify root causes, prevent recurrence, and turn denial data into higher collections.

There's no single Carelon timely filing number — it depends on the plan, state, and contract. See the 2026 breakdown by scenario, the most common reason claims get misrouted, and what to do if you already got a CO-29 denial.