Missouri Revised Statutes, Chapter 452, sec. 452.375
7. Upon a finding by the court that either parent has refused to exchange information with the other parent, which shall include but not be limited to information concerning the health, education and welfare of the child, the court shall order the parent to comply immediately and to pay the prevailing party a sum equal to the prevailing party's cost associated with obtaining the requested information, which shall include but not be limited to reasonable attorney's fees and court costs.
10. Unless a parent has been denied custody rights pursuant to this section or visitation rights under section 452.400, both parents shall have access to records and information pertaining to a minor child, including, but not limited to, medical, dental, and school records. If the parent without custody has been granted restricted or supervised visitation because the court has found that the parent with custody or the child has been the victim of domestic violence, as defined in section 455.200, RSMo, by the parent without custody, the court may order that the reports and records made available pursuant to this subsection not include the address of the parent with custody or the child. Unless a parent has been denied custody rights pursuant to this section or visitation rights under section 452.400, any judgment of dissolution or other applicable court order shall specifically allow both parents access to such records and reports.
11. Except as otherwise precluded by state or federal law, if any individual, professional, public or private institution or organization denies access or fails to provide or disclose any and all records and information, including, but not limited to, past and present dental, medical and school records pertaining to a minor child, to either parent upon the written request of such parent, the court shall, upon its finding that the individual, professional, public or private institution or organization denied such request without good cause, order that party to comply immediately with such request and to pay to the prevailing party all costs incurred, including, but not limited to, attorney's fees and court costs associated with obtaining the requested information.
Looks to me that the hospital had to turn over the medical records.
KAT