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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Specialties & Research
Dr. Elmer Chang, MD, PHD is board certified in Internal Medicine.
- He has special expertise in 3 areas:
- Colon Cancer
- Inflammatory Bowel Diseases (IBD)
- Peptic Ulcer
Education & Awards
Dr. Chang graduated from Northwestern University, Chicago.
Dr. Chang has 1 hospital affiliations:
- Mission Hospital
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- Additional Information
- Where does Dr. Elmer Y. Chang practice?
Dr. Elmer Chang practices Internal Medicine near Hayward, CA.
Additional practice locations include: Mission Viejo, CA.
See Hayward Internists.