Why did my fax fail to send?

A fax fails to send for one of six reasons a sender can act on: an unreadable file, a wrong number, a voice line, a busy line, no answer, or a receiving machine that is off or out of paper. After any of them, call the office, confirm its fax number and resend only to the number it confirms.

This page covers a fax that did not get through. A fax that landed with the wrong office is a different problem, and Is a fax sent to the wrong number a HIPAA breach? takes it up.

Which of the six causes is it?

Check them nearest first: your file, then the number, then the office's end of the line.

Is the file at fault?

A file that will not open on your own screen will not fax, and a locked or damaged one can fail a send outright. That failure says nothing about the number. Blank, faint or cut-off pages are a separate trap: they can go through and still leave the office nothing to read.

Is the number at fault?

One wrong digit dials a different line. A number can also change hands, as when an office closes its fax account before it moves the number, and How to port a fax number before you cancel gives the order that avoids it. A number copied from a website or a letterhead may be the office's main line, where a person or a voicemail greeting answers and no fax can be received.

Is the office's end at fault?

A busy signal says the line was in use. It does not say the line is the office's fax line, and an office that takes calls and faxes on one number is busy whenever either is running. When the line rings and nothing answers, the office may be closed, the machine may be off, or the machine may be set to wait for a person. Whether a machine without paper can still take pages in depends on the model.

A call can also connect and then drop. Ask which pages arrived, because a resend of the whole document puts those pages at the office a second time.

What do you do before any resend?

Call first. A failed send leaves the number in doubt, and the Privacy Rule requires a covered entity to "reasonably safeguard protected health information from any intentional or unintentional use or disclosure" that violates the rule (45 CFR 164.530(c)(2)(i)). That standard names no method for a fax. A call to the office settles the number before the pages go out again.

Dial the office on a voice number you already hold, such as the one on the referral or in the chart. Ask four things:

• The fax number it uses today, read back digit by digit.
• Whether the machine is on and ready to take a fax, and during which hours.
• Which pages, if any, arrived.
• Whether the number has changed since the last fax the two offices exchanged.

None of the four needs a patient's name. If the number matches the one you dialed, resend to it. If the office gives a different one, take it from the office and use it alone.

Why not try the next number you find?

A number from a search result, a website or an old record can belong to another office, and a fax sent there can reach someone who should not see it. That is the unintentional disclosure the safeguards standard covers (45 CFR 164.530(c)(2)(i)). A failure can even be the lucky outcome: a wrong number that belonged to a working fax machine would have delivered the pages.

Unless the call dropped partway, the failed attempt put no pages in front of anyone. The resend is the step that can. Hold the pages until the office has answered about the first number. If pages did reach an office that should not have them, the page linked at the top picks up from there.

What goes in the record of a failed fax?

Write the attempt down the same day: the date and time, the number dialed, the page count, what happened, who at the office confirmed the number and when the resend went. File the note with the request the fax served.

The safeguards standard names no note for a failed fax and no period for one (45 CFR 164.530(c)). The six years in 45 CFR 164.316(b)(2)(i) and 164.530(j)(2) run on the documentation those sections require, so where the practice files the note decides how long it stays. How long must you keep fax records under HIPAA? separates the clocks.

Every delivered fax on a Fax Pigeon plan comes with a delivery certificate. A failed fax has no delivery to certify, so the note you write is the record of the attempt.

* Fax Pigeon prices and plan terms as of October 14, 2026.