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Dear Mr. Abril,
Thank you for posting your request on History Hub!
The information you seek should be in your grandfather’s medical records rather than in the records of the hospital. Medical records of officers and enlisted personnel of the U.S. Marine Corps who were separated from service after 1904 and prior to 1957 are located at NARA's National Personnel Records Center (NPRC), (Military Personnel Records), 1 Archives Drive, St. Louis, MO 63138-1002. To request these records, please mail a completed GSA Standard Form 180 to NPRC. Or you may apply online at https://www.archives.gov/veterans/military-service-records/.
We hope this is helpful. Best of luck with your family research!
[Information provided by Nate Patch, Subject Matter Expert]