Murray was found guilty of the manslaughter of Michael Jackson in November last year, and is currently serving a four-year jail sentence.
According to documents obtained by TMZ, the Medical Board of California has suspended Murray's license automatically following his felony conviction.
He has now been given 15 days to return his medical certificate or face possible charges.
It was initially believed that Murray would represent himself in his upcoming appeal against his manslaughter verdict. However, it was recently reported that he has requested an attorney for the appeal.
Murray's ex-attorney spoke out against his former client's jail treatment last month, calling it "crazy" and "unbelievable".
More reaction from the Michael Jackson manslaughter case and conviction:
> Michael Jackson trial prosecutor: 'Conrad Murray interviews hurt him'
> Jermaine Jackson: 'Conrad Murray should have been charged with murder'
> Michael Jackson mother: 'Conrad Murray sentence not enough'
> Conrad Murray lawyer denies suicide watch claims