You should be able to get their ext at the VA to talk to their nurse or leave a voicemail.
The doctors cannot give out their numbers because it is violation of the va's practices according to the uniform code of military Justice and the compartmentalization of information not allowed to the general public. As a government worker their identities are kept in secret so to protect them from any possible infringement on their personal life
Call 911 for emergencies or if its a medication issue call a emergency pharmacists
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