The Medical Board of California has revoked the license of a fertility doctor who implanted the wrong embryos in a woman and didn´t tell her for 18 months.

The license of Doctor Steven Katz was pulled after the medical board concluded he engaged in what board members termed– “some of the most serious physician misconduct imaginable.”Katz, who operates Fertility Associates of the Bay Area, has admitted that he did not tell Susan Buchweitz he had mistakenly implanted embryos in her womb that were intended for another woman. Katz finally revealed his mistake to Buchweitz and the other woman about the same time the medical board was about to reveal the mix-up.

By then, the baby Buchweitz had given birth to was ten months old. Katz has until April 27th to appeal the decision in Superior Court. He can also seek a stay that would allow him to continue operating his practice. Meanwhile, Buchweitz and the other woman are involved in an ongoing custody dispute.