Sentry publishes one fax number, and it serves its California Medical Provider Network only. Medical and dental bills are not faxed to Sentry at all: they go electronically through a clearinghouse.
- Sentry Insurance publishes one fax number, 800-999-4642, and it belongs to its California Medical Provider Network.
- The same number covers two teams, so the attention line matters: MPN medical access assistants, or MPN Contacts.
- Sentry does not accept medical, dental, or pharmacy bills by fax anywhere in the country; those go through Jopari, Optum, or Change Healthcare.
- Claim number validation is a phone task, not a fax task.
Who This Page Is For
A medical provider, an injured worker, or an employer dealing with Sentry's California Medical Provider Network. If you are a biller trying to submit a medical, dental, or pharmacy invoice, there is no fax route anywhere in Sentry's system, the electronic path is below.
What is the Sentry Insurance fax number?
Sentry Insurance publishes one fax number, 800-999-4642, dedicated to the Sentry Insurance Group California Medical Provider Network. Two teams share the line, so the fax must name which one it is for: MPN medical access assistants, or MPN Contacts. This is a network access and administration fax, not a billing fax.
- Help finding an MPN physician or scheduling an appointment (Injured worker, employer, provider, Attention: MPN medical access assistants): fax 800-999-4642. Source: California MPN.
- Network questions or arranging an MPN independent medical review (Injured worker, employer, provider, Attention: MPN Contacts): fax 800-999-4642. Source: California MPN.
- Submit a workers compensation medical or dental bill (Medical or dental provider, All states): No fax. Electronic only, via Jopari, payer ID J1417. Source: Electronic medical billing.
Fax number verified 2026-09-17.
Which route should I use?
- California MPN question: fax 800-999-4642 with the right attention line, or call 855-346-4866 (press 3 for medical access assistants, 4 for MPN Contacts), or email ClaimsCAMPN@sentry.com.
- Workers compensation medical or dental bill, any state: submit electronically through Jopari with payer ID J1417 and the patient's claim number.
- Need to confirm a claim number before billing: call 800-473-6879, option 1 then option 3.
What to include before you send
Put the attention line at the top of the cover page. One fax number serving two teams means an unlabelled fax lands in the wrong queue. If you are sending protected health information on behalf of a covered entity, use a service that can sign a business associate agreement with you.
Dealing with more than one insurer on the same incident is common. Our directory also covers State Farm's fax numbers, how to fax Progressive, the Allstate fax page, USAA's claims fax, and sending a fax to Erie Insurance, each with its own destination and audience notes.
FAQs
Can I fax a workers compensation bill to Sentry if I am not set up for electronic billing?
Sentry's own guidance points only to electronic submission through Jopari, with no fax alternative published for any state. Jopari eBill enrollment is 866-269-0554, and billing questions go to Sentry at 800-473-6879, option 1 then option 3.
Does the California MPN fax number work for Sentry's Minnesota providers?
No. The Minnesota provider requirements exist because of Minnesota SB2193 and are entirely electronic: Jopari for medical and dental with payer ID J1417, Optum for pharmacy. No fax number appears on the Minnesota page at all.
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