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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. Crystal Cenell Simpson MD is a female Internist and practices in Internal Medicine.
Where does Dr. Crystal C. Simpson practice?
Dr. Crystal Simpson has 2 office locations.
Dr. Crystal Simpson practices Internal Medicine near Durham, NC.
See Durham Internists.