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Split it into smaller transmissions, or send it through the secure upload or portal the insurer prefers, because very large fax jobs jam, drop pages, and arrive out of order. A demand package with medical records, bills, and photos can run into hundreds of pages, and most insurer fax lines are not built for that. Ask the adjuster which channel they want, then keep a delivery record for every part.
Fax machines and fax services process pages one at a time over a phone connection, and a long job gives that connection many chances to fail. A busy signal halfway through, a paper jam at the receiving machine, or a line-quality dip can cut the job short, and the receiver may not notice pages are missing until someone reads the whole file. Large jobs also tie up the receiving line, which is why some insurer fax numbers ring busy for hours after a big transmission starts.
Page order is another quiet risk. When a fax job restarts after a failure, pages can duplicate or arrive in a second batch that gets filed separately. For a demand package, where the order of records tells the story of an injury, a scrambled file can slow the claim or weaken the demand. Splitting the package into labelled parts avoids both problems at once.
| Option | When it fits | Proof to keep |
|---|---|---|
| Split fax in labelled parts | The adjuster accepts fax and the package is under a few hundred pages | One confirmation page per part |
| Insurer secure upload or portal | The insurer offers one, which most large carriers now do | Upload receipt or confirmation email |
| Certified or registered mail | The demand letter itself needs formal proof of delivery | Tracking and delivery receipt |
| Overnight courier with tracking | A deadline is near and the file is very large | Tracking record and signed delivery |
Break the package into logical parts and fax each part as its own job. A workable split: part one, the demand letter; part two, medical records in date order; part three, bills and wage-loss documents; part four, photos and supporting exhibits. Put a short cover sheet on each part naming the claim number, the part number, and the total page count for that part, and tell the adjuster by email or phone that the parts are coming. That way a missing part is obvious to both sides.
Keep each fax job to a size the receiving line can handle in one sitting. There is no universal limit, since it depends on the receiver, but jobs of a few dozen pages each are far more reliable than a single job of several hundred. Confirm receipt of each part before sending the next one if the claim is time-sensitive.
Some adjusters still work from fax queues, especially in smaller offices. In that case, fax the demand letter itself and ask whether the supporting records can follow through a different channel. Many adjusters will accept records by secure upload even when the demand letter arrives by fax. Get that permission in writing, such as an email from the adjuster naming the upload link, so nobody later claims the records were never received.
Whatever channel you use, keep a complete copy of the sent package and a delivery record for every part. If the insurer later says a record is missing, your copy and your confirmation pages settle the question fast. Note that LetterAgent fax is in testing, so confirm receipt with the adjuster rather than assuming a large job arrived intact.
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