Dr Margaret M Shaffer, MD - Medicare Pathology in Washington, DC

Dr Margaret M Shaffer, MD is a medicare enrolled "Pathology - Anatomic Pathology & Clinical Pathology" physician in Washington, District Of Columbia. She went to George Washington University School Of Medicine and graduated in 1989 and has 35 years of diverse experience with area of expertise as Pathology. She is a member of the group practice Johns Hopkins University, Johns Hopkins University and her current practice location is 5255 Loughboro Rd Nw, Washington, District Of Columbia. You can reach out to her office (for appointments etc.) via phone at (202) 537-4455.

Dr Margaret M Shaffer is licensed to practice in Maryland (license number D79890) 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 1851507719.

Contact Information

Dr Margaret M Shaffer, MD
5255 Loughboro Rd Nw,
Washington, DC 20016-2633
(202) 537-4455
Not Available

Map and Direction




Physician's Profile

Full NameDr Margaret M Shaffer
GenderFemale
SpecialityPathology
Experience35 Years
Location5255 Loughboro Rd Nw, Washington, District Of Columbia
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 Margaret M Shaffer attended and graduated from George Washington University School Of Medicine in 1989
  NPI Data:
  • NPI Number: 1851507719
  • Provider Enumeration Date: 05/15/2007
  • Last Update Date: 12/22/2021
  Medicare PECOS Information:
  • PECOS PAC ID: 4082671771
  • Enrollment ID: I20041214000888

Medical Identifiers

Medical identifiers for Dr Margaret M Shaffer such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1851507719NPI-NPPES
D79890OtherMDMD LICENSE
MD20064OtherDCDC LICENSE

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207ZP0102XPathology - Anatomic Pathology & Clinical Pathology D79890 (Maryland)Primary
207ZP0102XPathology - Anatomic Pathology & Clinical Pathology MD20064 (District Of Columbia)Secondary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Sibley Memorial HospitalWashington, DCHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Johns Hopkins University4981745098571
Johns Hopkins University89219031472692

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 Margaret M Shaffer allows following entities to bill medicare on her behalf.
Entity NameJohns Hopkins University
Entity TypePart B Supplier - Hospital Department(s)
Entity IdentifiersNPI Number: 1477540904
PECOS PAC ID: 4981745098
Enrollment ID: O20150331000171

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 Margaret M Shaffer 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 Margaret M Shaffer, MD
6201 Greenleigh Ave,
Middle River, MD 21220-2004

Ph: () -
Dr Margaret M Shaffer, MD
5255 Loughboro Rd Nw,
Washington, DC 20016-2633

Ph: (202) 537-4455

Reviews and Comments


Pathology Doctors in Washington, DC

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Andrea L Richardson, MD PHD
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Phone: 202-677-6600    Fax: 202-677-6601
Dr. Luigi Kuo Feng Rao, M.D., M.S.
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Phone: 202-782-1017    Fax: 202-782-3217

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.