With more than 4,000 anesthesiologists and CRNAs under its banner, NorthStar partners with more than 280 client sites across over 20 states and counting to deliver a more productive and efficient model of anesthesia care. - Cases include: orthopedic, neuro, neurovascular, cardiac, thoracic, OB (tertiary high risk OB referral center), general, ophthalmology, urology, ENT, oncology.