Do I need a fax number for e-prescribing?

The short answer: yes. If you are enrolling in e-prescribing, the platform will ask for a fax number, and at some platforms the field is mandatory. Two examples you can check directly (both read at the vendors' help centers in August 2026):

• TherapyNotes makes the fax number a required field for ePrescribe enrollment: without one, enrollment does not proceed.
• Headway's provider documentation states that fax is required as a backup channel for e-prescribing, and notes that providers without one can set up an e-fax number online.

This is not a quirk of those two platforms. E-prescribing rides networks that connect thousands of EHRs and pharmacies, and the fax number is the designed failover.

Why a prescription network still wants a fax number

Electronic prescribing works most of the time. When a transmission fails between systems, or a pharmacy needs to send back a clarification, a refill request, or a rejection, the network falls back to the one channel every pharmacy in the country still runs: fax. Your fax number is where that traffic lands.

Which leads to the detail that most guides skip: the requirement is about receiving. The point of the backup channel is that pharmacies can reach you. A send-only tool or a shared outbound number does not satisfy it, because nothing addressed to you would ever reach you. Fax Pigeon's free first fax is send-only by design; the inbound-capable number that satisfies e-prescribing comes with every paid plan, from $4.99 a month billed annually.

What satisfies the requirement

Three properties, in order of importance:

1. Inbound-capable and yours. A dedicated fax number that your practice controls, where incoming pages land in an inbox you actually check.
2. HIPAA-covered. Prescription traffic is PHI, so the service holding your number needs a signed Business Associate Agreement with you.
3. Portable. Numbers get printed on forms and filed with networks. Pick a service that ports your number in free and, just as important, lets it port out free if you ever leave.

A practice number, not a personal line

Prescribers sometimes hold a free personal fax line through a physician network. Those lines belong to the individual clinician: Doximity's Terms, for one, bar members from letting others use their login, so a line is not a shared inbox for the practice. The number you file with an e-prescribing network is the practice's number. A Fax Pigeon plan gives you one you own, that ports anywhere, that your whole team can share on any plan, and that carries a delivery certificate for every fax you send.

What it should cost

Fax Pigeon's Basic plan is $4.99 per month billed annually ($5.99 month to month): your own inbound and outbound fax number, 200 pages, free porting both directions, e-signatures, and a signed BAA included, with the full agreement public at faxpigeon.com/baa before you sign up. Enter the number on your ePrescribe enrollment the day you activate. See the plans and pricing.

Fax Pigeon is not affiliated with TherapyNotes, Headway, or Doximity. Help center language referenced above was read in August 2026; check the sources for later changes.