A hash value is a long string of characters that represents your account. This provides security for the data due to the hash values being randomly generated. They are a one-way trip: the original data can't be recreated or decrypted from the hash value. This is all encrypted for additional safety.
If you wish to contact someone for support, please consult either your invitation email or the "Support" section in your Universal Health Record as each medical facility may request that you contact them differently with questions about your information.