Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Dr. Mark Harris Mellow, MD

Individual provider Gastroenterology Physician · NPI 1366426298

Dr. Mark Harris Mellow, MD is a Gastroenterology Physician in Oklahoma City, Oklahoma. Licensed in Massachusetts, New York and Oklahoma. Registered with an NPI since 2005.

Licensed in
MA, NY, OK
In the registry since
2005
Specialties on file
3
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

3366 NW Expressway St 650
Oklahoma City, OK 73112-4462
Phone: (405) 713-4430
Fax: (405) 713-4429
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Gastroenterology Physician (primary) Taxonomy 207RG0100X · Licence 14105 (OK)
Gastroenterology Physician Taxonomy 207RG0100X · Licence 36011 (MA)
Gastroenterology Physician Taxonomy 207RG0100X · Licence 108354 (NY)

Record details

NPI number1366426298
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedDecember 5, 2005
Last updated in NPPESApril 2, 2014

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