They usually send the bills in the mail
Call 888-827-4817, this is the number that I call to make monthly copayments to the Portland VA. I'm certain that they can help you, or connect you with someone who can.
If you call the Rx renewal line and follow the voice prompts there is a option to check for your medical co pay information. Portland Rx # is 503.273.5201 If you're needing to know other things, like home loans or GI Bill info, you're not going to get the info here; that could be handled through the Oregon Department of Veterans Affairs. Good luck.
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