§26-2-601 MCA. Beehler and Goodson v. Eastern Radiological Assoc., Giuliano, and St. Vincent Healthcare, DA 11-618. A non-radiologist infection specialist was qualified to testify about the subject matter of whether failure of a radiologist to wear a mask while performing a myelogram violated the standard for infection control applicable to the radiologist and the hospital where the myelogram was performed. §26-2-601 MCA provides: A person may not testify as an expert witness on issues relating to negligence and standards of care and practice in an action on a malpractice claim . . . unless the person is licensed as a health care provider in at least one state and routinely treats or has routinely treated within the previous 5 years the diagnosis or condition or provides the type of treatment that is the subject matter of the malpractice claim or is or was within the previous 5 years an instructor of students in an accredited health professional school or accredited residency or clinical research program relating to the diagnosis or condition or the type of treatment that is the subject matter of the malpractice claim; and shows by competent evidence that, as a result of education, training, knowledge, and experience in the evaluation, diagnosis, or treatment of the disease or injury that is the subject matter of the malpractice claim against the health care provider, the person is thoroughly familiar with the standards of care and practice as they related to the act or omission that is the subject matter of the malpractice claim on the date of the incident upon which the malpractice claim is based. A person qualified as an expert in one medical specialty or subspecialty is not qualified to testify with respect to a malpractice claim against a health care provider in another medical specialty or subspecialty unless there is a showing that the standards of care and practice in the two specialty or subspecialty fields are substantially similar, but this does not apply if the subject matter of the malpractice claim against the health care provider is unrelated to the relevant specialty or subspecialty.