Gregory Don Balcerak, DO
Internal Medicine Physician · Stillwater, OK
Gregory Don Balcerak, DO is an internal medicine physician with a practice address in Stillwater, Oklahoma, and NPI 1538839154, issued on Sep 15, 2021. Check the license (Oklahoma 8596, as entered in NPPES) on the Oklahoma Board of Medical Licensure and Supervision; the Medicare figures below come from public CMS files.
- Name
- Gregory Don Balcerak
- Credential
- DO
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 8596 OK
Self-reported in NPPES; status is on the state search - Practice location
- 1815 W 6TH Ave, Stillwater, OK 74074
- Phone
- (405) 743-7300
- Enumerated
- Sep 15, 2021
- Record last updated
- Jul 27, 2026
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 1,115 in Oklahoma → Look up another NPI →
Also registered at 1815 W 6TH Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- James Carley, M.D.Family Medicine Physician1669458303
Verify Gregory Don Balcerak 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 8596Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
97% fewer Medicare Part D claims than the average internal medicine physician in 2024
98 Medicare Part D claims for 21 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
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.
Gregory Don Balcerak among 1,115 internal medicine physician records in Oklahoma
Gregory Don Balcerak, DO 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 2021, is newer than 84% of them.
- NPI issued2021 · 84% of these records are older, 11% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileNo · 59% of these records are
- Record last updated2026 · 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).
24 internal medicine physician records list a practice address in Stillwater
They are 24 of the 1,440 NPPES records with a practice address in Stillwater, and 1,115 internal medicine physician records in Oklahoma.
All 1,115 in Oklahoma → Every provider in Stillwater → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Terry Brown, M.D.Stillwater, OK 740741124004759
- Steven Cummings, M.D.Stillwater, OK 740741750365292
- Sam Earnest, M.D.Stillwater, OK 740741962488742
- Gilbert Emde, M.D.Stillwater, OK 740741801889373
- Jennifer Ferrell, DOStillwater, OK 740741902860406
- Jennifer Gallaway, ARNPStillwater, OK 740741194767327
- Darren Green, M.D.Stillwater, OK 740741851378293
- Woody Jenkins, M.D.Stillwater, OK 740741639156672
Common questions
What is Gregory Don Balcerak, DO's NPI number?
Gregory Don Balcerak, DO's National Provider Identifier (NPI) is 1538839154, issued on Sep 15, 2021. An NPI identifies a provider in billing; it is not a license.
Where is Gregory Don Balcerak, DO located?
The NPPES record lists a practice address at 1815 W 6TH Ave, Stillwater, OK, 74074. Phone: (405) 743-7300. Providers update this record themselves, so call before visiting.
How can I verify Gregory Don Balcerak, DO's license?
NPPES lists Oklahoma license number 8596, 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 Gregory Don Balcerak, DO prescribe under Medicare Part D?
In 2024, Gregory Don Balcerak, DO had 98 Medicare Part D claims for 21 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.