Marisa Gefen, M.D.
Internal Medicine Physician · Philadelphia, PA
Marisa Gefen, M.D. is an internal medicine physician with a practice address in Philadelphia, Pennsylvania, and NPI 1386846806, issued on Jun 5, 2007. Check the license (Pennsylvania MD439866, as entered in NPPES) on the Pennsylvania Department of State (PALS); the Medicare figures below come from public CMS files.
- Name
- Marisa Gefen
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- MD439866 PA
Self-reported in NPPES; status is on the state search - Practice location
- 37 S 40TH St, Philadelphia, PA 19104
- Phone
- (215) 444-7470
- Enumerated
- Jun 5, 2007
- Record last updated
- Apr 30, 2025
- Fax
- (215) 764-6556
- Medicare enrollment
- Enrolled (PECOS I20110404000174); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,300 in Pennsylvania → Look up another NPI →
Also registered at 37 S 40TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Lisa Bush, CRNPFamily Nurse Practitioner1306382171
- Jason Weaver, MSW, LCSWClinical Social Worker1194085274
Verify Marisa Gefen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersPennsylvania Department of State (PALS)
Search for license MD439866Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.2 times the Medicare Part D claims of the average internal medicine physician in 2024
6,843 Medicare Part D claims for 271 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 15% of claims. 37 claims were for opioids.
Most prescribed
- Atorvastatin Calcium659 claims
- Amlodipine Besylate484 claims
- Omeprazole246 claims
- Losartan Potassium228 claims
- Duloxetine Hcl226 claims
- Albuterol Sulfate Hfa225 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.
Industry payments in 2024: $58.35
1 payment: food and beverage; the largest payer was Abbott Laboratories. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Osh - PA Physicians Group, PCWyncote, PA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Marisa Gefen among 7,300 internal medicine physician records in Pennsylvania
Marisa Gefen, M.D. is one of 7,300 internal medicine physician records with a practice address in Pennsylvania. 78% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 36% of them.
- NPI issued2007 · 36% of these records are older, 57% newer
- In a Medicare fileYes · 78% of these records are
- In the CMS Doctors and Clinicians fileYes · 58% of these records are
- Graduated2007 · median 2008 among the 4,208 with a school on file
- Record last updated2025 · 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 Pennsylvania practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
1,855 internal medicine physician records list a practice address in Philadelphia
They are 1,855 of the 42,849 NPPES records with a practice address in Philadelphia, and 7,300 internal medicine physician records in Pennsylvania.
All 7,300 in Pennsylvania → Every provider in Philadelphia → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Amy Behrman, MDPhiladelphia, PA 191041851331870
- Martin Bohnenkamp, MDPhiladelphia, PA 191041770528259
- John Bruza, MDPhiladelphia, PA 191041093758310
- Jill Clemmer, MDPhiladelphia, PA 191041477594562
- John Flamma, MDPhiladelphia, PA 191041477500296
- Kevin Fosnocht, MDPhiladelphia, PA 191041003842709
- William Gilhool, DOPhiladelphia, PA 191041982606919
- Bruce Kinosian, MDPhiladelphia, PA 191041871536177
Common questions
What is Marisa Gefen, M.D.'s NPI number?
Marisa Gefen, M.D.'s National Provider Identifier (NPI) is 1386846806, issued on Jun 5, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Marisa Gefen, M.D. located?
The NPPES record lists a practice address at 37 S 40TH St, Philadelphia, PA, 19104. Phone: (215) 444-7470. Providers update this record themselves, so call before visiting.
How can I verify Marisa Gefen, M.D.'s license?
NPPES lists Pennsylvania license number MD439866, as entered by the provider. Search the Pennsylvania Department of State (PALS) at https://www.pals.pa.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Marisa Gefen, M.D. prescribe under Medicare Part D?
In 2024, Marisa Gefen, M.D. had 6,843 Medicare Part D claims for 271 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.