Unless your rights have been terminated by a Judicial proceeding, either via Termination and/or Adoption, you have rights.
MCA § 93-5-26 (click) provides that you, as a parent, have rights of access to records and information pertaining to your minor child(ren), including but not limited to medical, dental and school records and these shall NOT be denied to a parent because you are not the custodial parent.
Schools, doctors and dentists offices should take note of the above. Also, as a parent, you should be informed and have a copy of this statute with you when seeking this information if the other parent is not forthcoming.
(601) 850-8000 or Matthew@bowtielawyer.ms