California MSK MSO (MSK) is a Management Services Organization (MSO) located in the greater Los Angeles area. MSK performs comprehensive management and billing services for health care providers and medical professionals including private medical clinics and individual practices, as well as therapy, imaging, and urgent care centers. MSK is able to provide full or a la carte services based on the needs of the client. Services include: Human Resource Management, Accounting, Credentialing, Revenue Cycle Management, Payer Contracting, Strategic Planning, Inventory Management, Compliance, Risk Management, and Operations Management. MSK hires enthusiastic and conscientious individuals who work well in teams, are committed to excellence, and want to make the world a better place.