Dr Marisa Gefen, MD - Medicare Internal Medicine in Philadelphia, PA

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Dr Marisa Gefen, MD is a medicare enrolled "Internal Medicine" physician in Philadelphia, Pennsylvania. She went to Jefferson Medical College Of Thomas Jefferson University and graduated in 2007 and has 17 years of diverse experience with area of expertise as Internal Medicine. She is a member of the group practice Osh - Pa Physicians Group, Pc and her current practice location is 37 S 40th St, Philadelphia, Pennsylvania. You can reach out to her office (for appointments etc.) via phone at (215) 444-7470.

Dr Marisa Gefen is licensed to practice in Pennsylvania (license number MD439866) and she also participates in the medicare program. She accepts medicare assignments (which means she accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and her NPI Number is 1386846806.

Contact Information

Dr Marisa Gefen, MD
37 S 40th St,
Philadelphia, PA 19104-3042
(215) 444-7470
(215) 764-6556

Map and Direction




Physician's Profile

Full NameDr Marisa Gefen
GenderFemale
SpecialityInternal Medicine
Experience17 Years
Location37 S 40th St, Philadelphia, Pennsylvania
Accepts Medicare AssignmentsYes. She accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance.
  Medical Education and Training:
  • Dr Marisa Gefen attended and graduated from Jefferson Medical College Of Thomas Jefferson University in 2007
  NPI Data:
  • NPI Number: 1386846806
  • Provider Enumeration Date: 06/05/2007
  • Last Update Date: 06/26/2024
  Medicare PECOS Information:
  • PECOS PAC ID: 7618151465
  • Enrollment ID: I20110404000174

Medical Identifiers

Medical identifiers for Dr Marisa Gefen such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1386846806NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207R00000XInternal Medicine MD439866 (Pennsylvania)Primary

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Osh - Pa Physicians Group, Pc751721387968

Medicare Reassignments

Some practitioners may not bill the customers directly but medicare billing happens through clinics / group practice / hospitals where the provider works. Medicare reassignment of benefits is a mechanism by which practitioners allow third parties to bill and receive payment for medicare services performed by them. Dr Marisa Gefen allows following entities to bill medicare on her behalf.
Entity NameNinth Street Internal Medicine Associates Ltd
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1598719627
PECOS PAC ID: 5799763702
Enrollment ID: O20040707001329
Entity NameAmpersand Health-pa, Llc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1760865711
PECOS PAC ID: 3173830544
Enrollment ID: O20150917000086
Entity NameOsh - Pa Physicians Group, Pc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1811405533
PECOS PAC ID: 7517213879
Enrollment ID: O20180629000414

Medicare Part D Prescriber Enrollment

Any physician or other eligible professional who prescribes Part D drugs must either enroll in the Medicare program or opt out in order to prescribe drugs to their patients with Part D prescription drug benefit plans. Dr Marisa Gefen is enrolled with medicare and thus, if eligible, can prescribe medicare part D drugs to patients with medicare part D benefits.

Mailing Address and Practice Location

Mailing AddressPractice Location Address
Dr Marisa Gefen, MD
30 W Monroe St Ste 1200,
Chicago, IL 60603-2420

Ph: (312) 733-9730		Dr Marisa Gefen, MD
37 S 40th St,
Philadelphia, PA 19104-3042

Ph: (215) 444-7470

Reviews and Comments


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Medicare Program: Medicare is a federal government program which provides health insurance to people who are 65 or older. This program also covers certain younger people with disabilities (who receive Social Security Disability Insurance - SSDI), and people with End-Stage Renal Disease (permanent kidney failure requiring dialysis or a transplant, sometimes called ESRD.

Medicare Assignment: Assignment means that your doctor, provider, or supplier agrees (or is required by law) to accept the Medicare-approved amount as full payment for covered services. Most doctors, providers, and suppliers accept assignment, but you should always check to make sure. Participating providers have signed an agreement to accept assignment for all Medicare-covered services.

NPI Number: The National Provider Identifier (NPI) is a unique identification number for covered health care providers. The NPI must be used in lieu of legacy provider identifiers in the HIPAA standards transactions. Covered health care providers and all health plans and health care clearinghouses must use the NPIs in the administrative and financial transactions adopted under HIPAA (Health Insurance Portability and Accountability Act).

Our Data: Information on www.medicarelist.com is built using data sources published by Centers for Medicare & Medicaid Services (CMS) under Freedom of Information Act (FOIA). The information disclosed on the NPI Registry are FOIA-disclosable and are required to be disclosed under the FOIA and the eFOIA amendments to the FOIA. There is no way to 'opt out' or 'suppress' the NPPES record data for health care providers with active NPIs.