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DR. MARISA GEFEN M.D.
NPI 1386846806
Internal Medicine in Philadelphia, PA

Active since June 05, 2007PECOS EnrolledAccepts Medicare Assignment
37 S 40TH ST, PHILADELPHIA, PA 19104(215) 444-7470(215) 764-6556 Get Directions Write a Review

NPPES record last updated: April 30, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Jun 26, 2024, Sep 9, 2020, May 18, 2020 and 1 more (4 updates tracked since 2018).

About Dr. Marisa Gefen M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. MARISA GEFEN M.D. (NPI 1386846806) is an individual internal medicine provider in Philadelphia, Pennsylvania, licensed in Pennsylvania (MD439866) and active in the NPI registry since June 2007. She is enrolled in Medicare PECOS, maintains a secondary practice location in York, and is a graduate of Other (2007).

NPPES Registry Identity

NPI1386846806
Entity TypeIndividualFemale
Primary Taxonomy207R00000X
Provider Legal NameDR. MARISA GEFENCredential: M.D.
Location Address37 S 40TH STPhiladelphia, PA 19104-3042
Mailing AddressPo Box 746722Atlanta, GA 30374-6722 · (312) 733-9730 · Fax (773) 866-8014
Phone(215) 444-7470
Fax(215) 764-6556
Sole ProprietorNo
Medical School CMSOtherGraduated 2007
Enumeration DateJune 5, 2007
Last NPPES UpdateApril 30, 20254 updates tracked since enumeration
NPPES CertifiedApril 30, 2025
✔ NPI 1386846806 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in PA · MD439866
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
37 S 40TH ST, Philadelphia, PA 19104
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Other Names 1

Former Name (1)Dr. Marisa Bashkin

Secondary Practice Location 1

Location 11113 Carlisle RdYork, PA 17404-4939 · Phone (717) 200-1567 · Fax (717) 674-6145

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Marisa Gefen M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID7618151465
PECOS Enrollment IDI20110404000174
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

3

Medicare enrollment records show Marisa Gefen reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Ninth Street Internal Medicine Associates Ltd
2.6 mi
Internal Medicine
805 LOCUST STREET
Philadelphia, PA 19107
  • Reassigned Medicare billing, Pennsylvania enrollment
  • 24 clinicians in this Medicare group
NPI 1598719627 (215) 440-8681
Osh - PA Physicians Group, PC
6.2 mi
Primary Care
3621 ARAMINGO AVE STE C5
Philadelphia, PA 19134
  • Reassigned Medicare billing, Pennsylvania enrollment
  • 196 clinicians in this Medicare group
NPI 1811405533 (215) 444-7472
Oak Street Health Of New York Medical Group PC
84 mi
Primary Care
455 SUTTER AVE
Brooklyn, NY 11212
  • Reassigned Medicare billing, New York enrollment
  • Medicare enrollment name: Griffin Myers Medical PC
  • 101 clinicians in this Medicare group
NPI 1780209445 (718) 765-6550

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 2

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more 99212
This is a routine check-up for patients who have previously seen the doctor. During this 10-19 minute visit, the doctor will review your health status, discuss any concerns, and manage ongoing treatments or medications. It's a chance to ensure your health is on track.
25 services18 patients
Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit G0439
An annual wellness visit is a yearly appointment with your primary care provider to create or update a personalized prevention plan. This plan helps prevent illness based on your current health and risk factors. It's a subsequent visit, meaning it follows an initial assessment.
13 services13 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 19104 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$137.17 typical visit price
range $59.88 – $180.99
Typical copayment $34.29 (range $14.97 – $45.24)
Most-billed visit code 99204
Established Patient
$105.21 typical visit price
range $19.30 – $147.29
Typical copayment $26.30 (range $4.82 – $36.82)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 2

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

JASON CODY WEAVER MSW, LCSW
Social Worker (Clinical)
37 S 40TH ST
PHILADELPHIA, PA 19104
Philadelphia County (215) 444-7470
MRS. LISA M BUSH CRNP
Nurse Practitioner (Family)
37 S 40TH ST
PHILADELPHIA, PA 19104
Philadelphia County (215) 444-7470

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Marisa Gefen's NPI number?

The NPI number for Marisa Gefen is 1386846806. It was assigned to this individual provider in the NPPES registry on June 5, 2007. The provider is also known as Dr. Marisa Bashkin.

Where is Marisa Gefen located?

Marisa Gefen practices at 37 S 40th St, Philadelphia, PA 19104. The listed phone number is (215) 444-7470.

What is Marisa Gefen's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Marisa Gefen enrolled in Medicare?

Yes. Marisa Gefen is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Marisa Gefen's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Marisa Gefen reassigns Medicare benefits to 3 organizations: Ninth Street Internal Medicine Associates Ltd (Philadelphia, PA), Osh - PA Physicians Group, PC (Philadelphia, PA) and Oak Street Health Of New York Medical Group PC (Brooklyn, NY). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Marisa Gefen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Marisa Gefen was last updated on April 30, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.