
Dr Thatsaporn Rattanawongsa became the fourth suspect arrested for the charge.
Police raided Thon Buri Hospital and arrested Dr Thatsaporn as she was waiting to start her shift in the hospital.
Police then accompanied her to her residence in Sapan Kwai area to search for more evidence.
Police claimed that the doctor joined three other suspects who were arrested earlier in spreading the false information about HM the King's health.
The three suspects were Theeranun Wipuchanin, a former executive of a securities company, a Bangkok-based stock broker of KT-Zmico Securities Katha Pajariyapong and Somjaet Itthiworakun of Chon Buri province.
They were charged for allegedly violating Article 14 of the 2007 Computer Offence Act covering the posting of false computerised information that causes harm to national security and the general public.They could face up to five years in prison if convicted. They were later released on bail.