Tareq Kamleh worked in Queensland, South Australia and Western Australia before being recruited to the extremist group.
On Monday, the Adelaide-trained physician was still listed on the Australian Health Practitioner Regulation Agency internet database.
According to the web records, his registration started in December 2010 and will expire in September.
It's understood he is being investigated by the Medical Board of Australia, in liaison with the Australian Federal Police.
Medical authorities have declined to comment on the status of the investigation.
Kamleh maintained he had not breached any professional standards in an open letter to AHPRA posted to his Facebook page on Saturday.
"I formally deny that I have ever taken part in unprofessional conduct which would have jeopardised my doctor-patient relationship," he wrote.
He also denied he was brainwashed into joining IS and said his decision to venture to Syria was a "well-educated and calculated" one.
Kamleh - who now also goes by the name Abu Yousef Al-Australie - vowed never to return to Australia.
"I have finally returned home," he said.
He has previously appeared in an IS propaganda YouTube video calling for other medical professionals to join him in the Middle East.
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