Washington Revised Code Title 18. Businesses and Professions § 18.134.050. Out-of-state health care practitioner

(a) In the form of a consultation with a health care practitioner who has a practitioner-patient relationship with the patient and who remains responsible for diagnosing and treating the patient in the state;

(b) In the form of a specialty assessment, diagnosis, or recommendation for treatment. This does not include the provision of treatment; or

(c) In the form of follow up by a primary care practitioner, mental health practitioner, or recognized clinical specialist to maintain continuity of care with an established patient who is temporarily located in this state and received treatment in the state where the practitioner is located and licensed.