In practice, peer-to-peer review is available in many systems and is underused.
The denial letter states a specific reason. The appeal should address that reason first and explicitly, with the missing evidence attached, rather than restating the original case.
503A versus 503B
| Dimension | 503A | 503B outsourcing facility |
|---|
| Prescription required | Patient-specific | Not required |
| cGMP compliance | Exempt | Required |
| Primary regulator | State board | FDA registration and inspection |
| Release testing | Generally none | Required |
| Operative standard | USP <795> / <797> | cGMP plus USP |
| Practical consequence | Potency varies between sites | Potency is tested before release |
Concretely, where prerequisite therapy is required, the record needs the agent, the dates, the dose and the reason it was stopped. "Tried and failed" without those four elements is not documentation.
A substantial proportion of denials cite incomplete documentation rather than clinical non-eligibility, which is why complete first submissions matter.
Evidence every criterion in the dated record, not in a covering letter.