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Costco Pharmacy Fax Number — Warehouse Counters and Mail Order

Costco pharmacies sit inside individual warehouse locations, and each warehouse pharmacy keeps its own fax line for prescriptions and authorizations. Prescribers often e-prescribe, but paper prescriptions, refill authorizations, and prior authorization forms still travel by fax to the specific warehouse pharmacy. You confirm that number by calling the warehouse's pharmacy department, which many Costco members can use even without a membership since pharmacy access is required by law in most states. Costco also operates a separate mail-order pharmacy for home delivery, and it uses its own intake fax rather than any one warehouse's line.

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Costco Pharmacy Fax Number

Confirm the fax number with the Costco warehouse pharmacy or its mail-order service

Hours: Costco warehouse pharmacies generally follow business hours such as weekdays from about 10:00 AM to 7:00 PM with limited weekend times; faxes sent outside those hours are handled the next open day.

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What You Can Fax to Costco Pharmacy

  • Paper prescriptions from a provider
  • Refill authorization forms
  • Prior authorization requests
  • Prescription transfer paperwork
  • Insurance and member profile updates
Tip: Decide up front if the prescription is going to a warehouse pharmacy counter or to Costco's mail-order pharmacy, since they intake faxes on different numbers. Prescription documents are protected health information, so use a HIPAA-eligible service like Send FAX Mail's Business plan ($79.99/month) and keep the delivery receipt with the record. Include the patient's name and date of birth directly on the prescription.

Faxing to Costco Pharmacy — FAQ

In most states pharmacy services must be available to the public, so a prescriber can fax a prescription to a Costco warehouse pharmacy regardless of membership. Confirm any local specifics with the individual pharmacy when you call for its fax number.

A warehouse pharmacy fills prescriptions on its own local fax line, while Costco's mail-order pharmacy runs a distinct intake for home delivery. Pick the one that will actually dispense the medication, then obtain that path's number.

Phone that warehouse's pharmacy department and request the fax number for prescriptions or authorizations. Because it's tied to one location, a number from another warehouse won't deliver to the counter you intend.

Yes, prescribers routinely respond to Costco refill requests by fax to the warehouse pharmacy that sent them. Use the fax printed on the refill request or confirmed by the pharmacy, and include enough patient detail to match the profile.

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