Verdict
Structural — appeal rarely changes it
The denial reflects the plan's contract (an exclusion or an exhausted limit). Verify the payer applied the right facts, then move to the patient conversation rather than an appeal.
If the plan genuinely excludes the service, no appeal changes the contract — the productive moves are pre-treatment verification and patient financial conversations. Worth a second look only when the exclusion was misapplied (for example, a missing-tooth clause applied to a tooth extracted during coverage) — that narrow case is winnable with records.