The 42-year-old Bohn was listed in stable condition after being taken by ambulance to the Palm Beach Gardens Medical Center where doctors told him he had suffered a mild heart attack, the PGA said on its website.
Bohn shot a 72 to make the cut but withdrew from the event after experiencing chest pains soon after he putted out on the 18th hole.
Bohn, who has two wins on the US Tour, was expected to remain in hospital overnight and will undergo further tests on Saturday.
His wife was home in Georgia but his in-laws were with him at the medical center.
Bohn shot rounds of 71 and 72 to make the cut on the number before pulling out.