John Gemma
Internal Medicine Physician · Tulsa, OK
John Gemma is an internal medicine physician with a practice address in Tulsa, Oklahoma, and NPI 1750791760, issued on Apr 29, 2014. Check the license (Oklahoma 5744, as entered in NPPES) on the Oklahoma Board of Medical Licensure and Supervision; the Medicare figures below come from public CMS files.
- Name
- John Gemma
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 5744 OK
Self-reported in NPPES; status is on the state search - Practice location
- 4502 E 41St St, Tulsa, OK 74135
- Phone
- (918) 619-4400
- Enumerated
- Apr 29, 2014
- Record last updated
- Jun 27, 2017 (not updated in 9 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20170725000354); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 1,115 in Oklahoma → Look up another NPI →
Also registered at 4502 E 41St St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jennifer AbercrombieCase Manager/Care Coordinator1215741889
- Ashwin AdiviStudent in an Organized Health Care Education/Training Program1942950399
- Noor Ahmed, DOEmergency Medicine Physician1679102446
- Akhilesh Alexander, DOStudent in an Organized Health Care Education/Training Program1700626405
- Qaidar AlizaiStudent in an Organized Health Care Education/Training Program1306787122
- Shantana Allen, LPCClinical Social Worker1942625165
Verify John Gemma 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 5744Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
93% fewer Medicare Part D claims than the average internal medicine physician in 2024
222 Medicare Part D claims for 107 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 12 claims were for opioids.
Most prescribed
- Doxycycline Hyclate22 claims
- Prednisone20 claims
- Amoxicillin-Clavulanate Potass13 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Tulsa Hospital Medicine Physicians Group, LLCOwasso, OK
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John Gemma among 1,115 internal medicine physician records in Oklahoma
John Gemma is one of 1,115 internal medicine physician records with a practice address in Oklahoma. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2014, is newer than 64% of them.
- NPI issued2014 · 64% of these records are older, 34% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated2014 · median 2007 among the 653 with a school on file
- Record last updated2017 · 56% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Oklahoma practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
307 internal medicine physician records list a practice address in Tulsa
They are 307 of the 18,643 NPPES records with a practice address in Tulsa, and 1,115 internal medicine physician records in Oklahoma.
All 1,115 in Oklahoma → Every provider in Tulsa → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Pallavi Agarwal, M.D.Tulsa, OK 741351831249812
- Vishal Aggarwal, MDTulsa, OK 741351295705663
- Diana Chen, MDTulsa, OK 741351518919091
- David Gilbert, M.D.Tulsa, OK 741351225176779
- Robert Harris, M.D,Tulsa, OK 741351528061652
- Thomas Hoskison, MDTulsa, OK 741351598735953
- Martina Jelley, MDTulsa, OK 741351427028885
- David Kendrick, MD MPHTulsa, OK 741351952382798
Common questions
What is John Gemma's NPI number?
John Gemma's National Provider Identifier (NPI) is 1750791760, issued on Apr 29, 2014. An NPI identifies a provider in billing; it is not a license.
Where is John Gemma located?
The NPPES record lists a practice address at 4502 E 41St St, Tulsa, OK, 74135. Phone: (918) 619-4400. Providers update this record themselves, so call before visiting.
How can I verify John Gemma's license?
NPPES lists Oklahoma license number 5744, 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.
How much does John Gemma prescribe under Medicare Part D?
In 2024, John Gemma had 222 Medicare Part D claims for 107 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. 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.