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A medical license is required for a doctor to practice medicine in a particular state. Requirements vary by state but most require, at a minimum, post-graduate training in the doctor’s specific specialty. An NPI number is a national identifier unique to an individual health care provider and is managed by the Center for Medicare & Medicaid Services (CMS).

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Additional Information
Dr. John Carlyle Greenfield MD is a male Anesthesiologist and practices in Anesthesiology.
Where does Dr. John C. Greenfield practice?
Dr. John Greenfield has 1 office location.
Dr. John Greenfield practices Anesthesiology near Dallas, TX.
See Dallas Anesthesiologists.