Dr. Marisa Gefen, MD
- Medicare services, 2024
- 38
- Medicare patients, 2024
- 21
- Part D claims, 2024
- 6,843
- Hospital affiliations
- 1
- Industry payments
- $907
- Practice address
- 51 North 39th Street, Philadelphia, PA 19104
- Practice phone
- Call (215) 662-8000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Gefen's professional email, personal email and mobile number
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Dr. Marisa Gefen is an internist in Philadelphia, Pennsylvania
Dr. Gefen practices at Penn Presbyterian Medical Center in Philadelphia, Pennsylvania, part of University of Pennsylvania.
Dr. Gefen's NPI, 1386846806, was assigned on June 5, 2007. Dr. Gefen holds Pennsylvania license MD439866.
- NPI
- 1386846806NPI Registry (opens in a new tab)
- Medicare PAC ID
- 7618151465
- NPI enumeration date
- June 5, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (215) 662-8000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 45
- Medical school graduation
- 2007
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Marisa Gefen practices at Penn Presbyterian Medical Center in Philadelphia, Pennsylvania
Dr. Gefen's primary practice is Penn Presbyterian Medical Center, at 51 North 39th Street, Philadelphia, PA 19104 in Philadelphia County. The practice phone is (215) 662-8000.
- Penn Presbyterian Medical Center51 North 39th Street, Philadelphia, PA 19104 · Philadelphia CountyPhone(215) 662-8000
Source: Dmand AI Affiliation Data
Dr. Marisa Gefen is affiliated with 2 sites of care and 3 medical groups
Dr. Gefen's primary practice is Penn Presbyterian Medical Center in Philadelphia, Pennsylvania, part of University of Pennsylvania. The medical group on file is Oak Street Health (Aramingo Primary Care Clinic). Dmand AI also links Dr. Gefen to 2 more medical groups and 1 group practice or clinic, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Marisa Gefen's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Gefen practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Penn Presbyterian Medical Center | Available with a free account |
| +1 more site and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Marisa Gefen is one of 5,665 internists in Pennsylvania
Internal medicine is Dr. Gefen's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Gefen is licensed in Pennsylvania.
Specialties and state licenses
- Internal medicine, PennsylvaniaPrimary
Internists near Dr. Gefen
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Marisa Gefen billed Medicare for 38 services in 2024
CMS data shows 38 Medicare services from Dr. Gefen across 2 procedure codes in 2024, for 21 Medicare patients. Medicare paid $2,743 for them. Every service was in an office.
Dr. Gefen's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 662024: 2562%
- Other services
- 2023: 232024: 1343%
Dr. Gefen compared with the Pennsylvania median for internists, 2024
- Dr. Gefen
- Pennsylvania median
- Medicare services
- 38vs 41791% below
- Medicare patients
- 21vs 18589% below
- Part D claims
- 6,426vs 22428.7 times
Medians across 5,518 internists in Pennsylvania with Dmand AI profiles that report each measure.
Dr. Gefen's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Marisa Gefen treated 21 Medicare patients in 2024, average age 72
CMS counts 21 Medicare patients who saw Dr. Gefen in 2024. 75% of them have high blood pressure, and 62% have high cholesterol. Their average risk score is 1.36, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Gefen's median patient age at 76, with 76% women.
Chronic conditions among Dr. Gefen's Medicare patients, 2024
- High blood pressure75%
- High cholesterol62%
Share of Medicare patients with each condition. A patient can have several.
Dr. Gefen's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 76
Patient panel by sex, all payers
- Women76%
- Men23%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Marisa Gefen wrote 6,843 Medicare Part D claims in 2024
In 2024, Dr. Gefen wrote 6,843 Medicare Part D claims for 271 patients. 84% of them were for generic drugs. CMS names the drug for 6,426 of them, across 121 drugs with 11 or more claims each, at $737,535 in total drug cost. In 2023, CMS named 6,058 claims across 108 drugs.
Dr. Gefen's Part D claims by kind of drug, 2024
- Generic5,734 claims84%
- Brand-name1,053 claims15%
- Other56 claims1%
Dr. Gefen's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Gefen's Part D claims, 2024
- Opioids1%37 of 6,843 claims
- Antibiotics0%24 of 6,843 claims
- Antipsychotics, patients 65 and over2%126 of 6,843 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 6,0582024: 6,4266%
Drugs named by CMS: 121 in 2024, 108 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Marisa Gefen takes part in Medicare
Dr. Gefen accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Marisa Gefen received $907 in industry payments from 2016 to 2024
CMS Open Payments shows 43 general payments to Dr. Gefen from 13 drug and device companies from 2016 to 2024. Food and beverage make up the largest share, 93% of the total. GlaxoSmithKline, LLC. paid the most, $302.
General payments to Dr. Gefen by program year, 2016 to 2024
General payments to Dr. Gefen by kind, 2016 to 2024
- Food and beverage$84293%
- Education$657%
Companies that paid Dr. Gefen the most, 2016 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Marisa Gefen's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Marisa Gefen
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Marisa Gefen's NPI number?
Dr. Marisa Gefen's NPI number is 1386846806. It was assigned on June 5, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. Marisa Gefen?
Dr. Marisa Gefen is an internist in Philadelphia, Pennsylvania. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Marisa Gefen practice?
Dr. Gefen practices at 51 North 39th Street, Philadelphia, PA 19104. Dr. Gefen's primary practice is Penn Presbyterian Medical Center in Philadelphia, Pennsylvania, part of University of Pennsylvania. Dmand AI also links Dr. Gefen to 2 medical groups and 1 group practice or clinic.
What is Dr. Marisa Gefen's office phone number?
The practice phone on file for Dr. Gefen is (215) 662-8000.
What is Dr. Marisa Gefen's medical license number?
Dr. Gefen holds Pennsylvania license MD439866.
Which hospitals is Dr. Marisa Gefen affiliated with?
Dr. Gefen practices at Penn Presbyterian Medical Center in Philadelphia, Pennsylvania.
What medical group is Dr. Marisa Gefen part of?
Dr. Gefen is linked to Oak Street Health (Aramingo Primary Care Clinic). Dmand AI links Dr. Gefen to 2 more medical groups.
Does Dr. Marisa Gefen accept Medicare?
Yes. CMS data shows Dr. Gefen billed Medicare for 38 services in 2024, and Dr. Gefen accepts Medicare assignment.
How many Medicare patients does Dr. Marisa Gefen see?
CMS counts 21 Medicare patients who saw Dr. Gefen in 2024, with an average age of 72.
What services does Dr. Marisa Gefen bill to Medicare?
In 2024, Dr. Gefen's most billed Medicare services were office visit, established patient (99212) and medicare service (G0439).
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What drugs does Dr. Marisa Gefen prescribe most?
In 2024 Medicare Part D data, Dr. Gefen's most prescribed drugs by claims were Atorvastatin Calcium, Amlodipine Besylate and Omeprazole.
Has Dr. Marisa Gefen received payments from drug or device companies?
CMS Open Payments shows $907 in general payments to Dr. Gefen from 13 companies from 2016 to 2024. The largest total came from GlaxoSmithKline, LLC.
How long has Dr. Marisa Gefen been practicing?
Dr. Gefen graduated from medical school in 2007, 19 years ago.
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