Before using the MyAltaMed portal you must first request an activation code by: - Submitting a request on MyAltaMed.net, or - Calling (844) 498-3446, or - Visiting a AltaMed clinic Once you request your code it will be sent to you via text or email. For questions or help enrolling, call (844) 498-3446. MyAltaMed protects your privacy..