Oren Gersten, MD
Family Medicine Physician · South Portland, ME
Oren Gersten, MD is a family medicine physician with a practice address in South Portland, Maine, and NPI 1295129393, issued on Mar 26, 2015. Check the license (Maine MD22136, as entered in NPPES) on the Maine Board of Licensure in Medicine; the Medicare figures below come from public CMS files.
- Name
- Oren Gersten
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- MD22136 ME
Self-reported in NPPES; status is on the state search - Practice location
- 27 Ocean St Ste 3, South Portland, ME 04106
- Phone
- (207) 618-9792
- Enumerated
- Mar 26, 2015
- Record last updated
- Jan 23, 2019 (not updated in 7 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 1,172 in Maine → Look up another NPI →
Verify Oren Gersten in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMaine Board of Licensure in Medicine
Search for license MD22136Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
90% fewer Medicare Part D claims than the average family medicine physician in 2024
351 Medicare Part D claims for 36 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 7% of claims. 12 claims were for opioids.
Most prescribed
- Lisinopril31 claims
- Gabapentin28 claims
- Atorvastatin Calcium24 claims
- Losartan Potassium23 claims
- Amlodipine Besylate19 claims
- Levothyroxine Sodium14 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.
Oren Gersten among 1,172 family medicine physician records in Maine
Oren Gersten, MD is one of 1,172 family medicine physician records with a practice address in Maine. 76% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2015, is newer than 74% of them.
- NPI issued2015 · 74% of these records are older, 23% newer
- In a Medicare fileYes · 76% of these records are
- In the CMS Doctors and Clinicians fileNo · 57% of these records are
- Record last updated2019 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Maine practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
31 family medicine physician records list a practice address in South Portland
They are 31 of the 1,143 NPPES records with a practice address in South Portland, and 1,172 family medicine physician records in Maine.
All 1,172 in Maine → Every provider in South Portland → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Matthew Belcher, MDSouth Portland, ME 041061952351223
- Stephen Blair, D.O.South Portland, ME 041061992730311
- Morgen Buehner, MDSo Portland, ME 041061346315637
- Michael Ciampi, M.D.South Portland, ME 041061205862760
- Mary Connolly, MDSouth Portland, ME 041061558535559
- Megan Driscoll, MDSouth Portland, ME 041061265482152
- Jeffrey Grassmann, D.O.South Portland, ME 041061750580486
- John Hatzenbuehler, MDSouth Portland, ME 041061699844365
Common questions
What is Oren Gersten, MD's NPI number?
Oren Gersten, MD's National Provider Identifier (NPI) is 1295129393, issued on Mar 26, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Oren Gersten, MD located?
The NPPES record lists a practice address at 27 Ocean St Ste 3, South Portland, ME, 04106. Phone: (207) 618-9792. Providers update this record themselves, so call before visiting.
How can I verify Oren Gersten, MD's license?
NPPES lists Maine license number MD22136, as entered by the provider. Search the Maine Board of Licensure in Medicine at https://www.maine.gov/md/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Oren Gersten, MD prescribe under Medicare Part D?
In 2024, Oren Gersten, MD had 351 Medicare Part D claims for 36 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.