Mark Harris Mellow, M.D.
Gastroenterology Physician · Oklahoma City, OK
Mark Harris Mellow, M.D. is a gastroenterology physician with a practice address in Oklahoma City, Oklahoma, and NPI 1366426298, issued on Dec 5, 2005. Check the license (Oklahoma 14105, as entered in NPPES) on the Oklahoma Board of Medical Licensure and Supervision; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Mark Harris Mellow
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License numbers
- 14105 OK
36011 MA
108354 NY
Self-reported in NPPES; status is on the state search - Practice location
- 3366 NW Expressway St, Oklahoma City, OK 73112
- Phone
- (405) 713-4430
- Enumerated
- Dec 5, 2005
- Record last updated
- Apr 2, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (405) 713-4429
- Medicaid ID
- 100019460A OK
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 160 in Oklahoma → Look up another NPI →
Also registered at 3366 NW Expressway St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Santiago Reyes, MDPediatric Pulmonology Physician1497770911
Verify Mark Harris Mellow in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersOklahoma Board of Medical Licensure and Supervision
Search for license 14105Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Mark Harris Mellow among 160 gastroenterology physician records in Oklahoma
Mark Harris Mellow, M.D. is one of 160 gastroenterology physician records with a practice address in Oklahoma. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 69% newer
- In a Medicare fileNo · 81% of these records are
- In the CMS Doctors and Clinicians fileNo · 66% of these records are
- Record last updated2014 · 65% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a Oklahoma practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in Oklahoma
There are 160 gastroenterology physician records in Oklahoma. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 160 in Oklahoma → Every provider in Oklahoma City → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Kirtida Kumar, MDOklahoma City, OK 731121649274374
- John Maple, DOOklahoma City, OK 731121902879455
- Paul Maton, M.D.Oklahoma City, OK 731121538143466
- Matthew McBride, MDOklahoma City, OK 731121871536920
- Don Murray, M.D.Oklahoma City, OK 731121215912787
- Carl Raczkowski, M.D.Oklahoma City, OK 731121851375646
- Robert Rankin, M.D.Oklahoma City, OK 731121174507966
- Abbas Raza, MDOklahoma City, OK 731121326006040
Common questions
What is Mark Harris Mellow, M.D.'s NPI number?
Mark Harris Mellow, M.D.'s National Provider Identifier (NPI) is 1366426298, issued on Dec 5, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Mark Harris Mellow, M.D. located?
The NPPES record lists a practice address at 3366 NW Expressway St, Oklahoma City, OK, 73112. Phone: (405) 713-4430. Providers update this record themselves, so call before visiting.
How can I verify Mark Harris Mellow, M.D.'s license?
NPPES lists Oklahoma license number 14105, as entered by the provider. Search the Oklahoma Board of Medical Licensure and Supervision at https://www.okmedicalboard.org/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.