By your post, I'm not sure what it is you need. If you are rated as 100% service-connected you should be able to go to your closest VA facility for treatment.
If you have an urgent problem, you should present to an emergency room.
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l also am not clear as to your question. It sounds like you are being denied medical help from the VA hospital, but I really don't know. If that is the case you need to speak to the patient rep at the hospital. Perhaps you can clarify.
VA certificate of eligibility can be filled out, on-line, at http://www.benefits.va.gov/homeloans/documents/docs/veteran_registration_coe.pdf
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Reading through the tea leaves a bit, but presume you mean for the purposes of state benefits (tax exemptions), CHAMPVA and/or Chap 35. There should have been a certificate mailed along with your last RD. It may, or may not, have contained language regarding P&T disabled. If you don't have a copy my first suggestion is you register with ebenefits at https://www.ebenefits.va.gov/ebenefits-portal/ebenefits.portal. I believe you can obtain a copy of the certificate directly online. Other suggestion is you contact the VA call center at 800-827-1000 and explain the limited nature of your request. Good Luck.