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Because the pharmacy's hardest workflows were built around fax. Prior authorizations, refill requests, and benefit investigations still travel by fax between pharmacies, prescribers, and pharmacy benefit managers, and fax gives both sides a dated paper trail that plugs straight into their existing systems. E-prescribing solved new prescriptions years ago; it never fully replaced the back-and-forth.
| Task | What travels by fax | Why it isn't e-prescribing |
|---|---|---|
| Prior authorization | Clinical notes, lab results, and the prescriber's justification, sent to the pharmacy benefit manager | The benefit manager's review is a document exchange, not a prescription; e-prescribing standards were built for new orders, not appeals |
| Refill requests | The pharmacy's refill request, sent to the prescriber's office | Many prescriber offices still process these as faxed tasks inside their own queues |
| Controlled substances | Documentation around Schedule II prescriptions | Federal rules tightly limit faxed Schedule II orders themselves (long-term-care and hospice patients are the main exceptions), so the surrounding paperwork stays fax-based |
| Insurance appeals and coordination | Denial letters and coordination-of-benefits forms | Every insurer and plan runs its own portal; fax is the one channel all parties already have |
E-prescribing networks like Surescripts made the simple transaction electronic years ago: the doctor clicks, the pharmacy receives the order, done. That covered new prescriptions, which are the easy part. Everything around the order stayed document-shaped. The insurer saying no. The dose needing a written justification. The refill needing a doctor's sign-off. The plan asking for last year's lab work. Fax moves documents, and it moves them to any recipient with a phone number, no shared software required. So the pharmacy kept the fax machine for the hard parts even as the easy part went digital.
A fax produces a transmission confirmation with a timestamp and a page count, and both sides keep the same pages. When a prior authorization is disputed months later, the pharmacy can show exactly what was sent and when. Email could do this in theory, but the software behind the counter was built with fax queues as a core feature: incoming faxes land as work tasks automatically, assigned and tracked. Replacing fax means replacing that workflow, not just the transport. There is also a legal comfort factor: regulators treat point-to-point fax as a permissible way to move health information, which kept it respectable long after email became easier.
Real-time benefit checks and electronic prior authorization standards are slowly moving the work into software. The drag is coordination. The pharmacy, the prescriber, the insurer, and the benefit manager all have to adopt the same system before any single transaction can go fully electronic, and each party's incentive to switch lands at a different time. Until that alignment happens, the lowest common denominator wins. The lowest common denominator has a phone number.
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