Margaret Mahaffa, - Medicare Emergency Medicine in Walnut Creek, CA

Margaret Mahaffa, is a medicare enrolled "Emergency Medicine" physician in Walnut Creek, California. Her current practice location is 1425 S Main St, Walnut Creek, California. You can reach out to her office (for appointments etc.) via phone at (925) 295-4000.

Margaret Mahaffa is licensed to practice in California (license number A186494) and she also participates in the medicare program. She does not accept medicare assignments directly but she may accept medicare through third-party (refer to Reassignment section below) and may also prescribe medicare part D drugs. Her NPI Number is 1215557426.

Contact Information

Margaret Mahaffa,
1425 S Main St,
Walnut Creek, CA 94596-5318
(925) 295-4000
Not Available



Physician's Profile

Full NameMargaret Mahaffa
GenderFemale
SpecialityEmergency Medicine
Location1425 S Main St, Walnut Creek, California
Accepts Medicare AssignmentsMedicare enrolled and may accept medicare through third-party reassignment. May prescribe medicare part D drugs.
  NPI Data:
  • NPI Number: 1215557426
  • Provider Enumeration Date: 04/17/2020
  • Last Update Date: 08/02/2023
  Medicare PECOS Information:
  • PECOS PAC ID: 9830553742
  • Enrollment ID: I20230911004162

Medical Identifiers

Medical identifiers for Margaret Mahaffa such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1215557426NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207P00000XEmergency Medicine A186494 (California)Primary

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. Margaret Mahaffa allows following entities to bill medicare on her behalf.
Entity NamePermanente Medical Group Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1073606299
PECOS PAC ID: 8921910225
Enrollment ID: O20031104000710

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› Verified 2 days ago

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. Margaret Mahaffa 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
Margaret Mahaffa,
1425 S Main St,
Walnut Creek, CA 94596-5318

Ph: () -
Margaret Mahaffa,
1425 S Main St,
Walnut Creek, CA 94596-5318

Ph: (925) 295-4000

News Archive

Researchers assess long-term burden of PTSD in a region of Liberia

Researchers at Columbia University's Mailman School of Public Health assessed the geographical distribution of the long-term burden of Post-Traumatic Stress Disorder in a region of Liberia and report that the prevalence of PTSD remains high nearly two decades after the principal conflict there and five years after war in Liberia ended entirely.

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A team of scientists recently revealed that inside a closed room, the chance of airborne SARS-CoV-2 infection directly depends on the number of symptomatic COVID-19 patients in the room and the duration of exposure.

Overexpression of Sox3 gene in mice causes XX male sex reversal

A team of researchers, led by Paul Thomas, University of Adelaide, Australia, has now determined that overexpression of the Sox3 gene in mice causes frequent XX male sex reversal.

New drug tricks the body into burning off fat

French scientists have found a drug they say tricks the body into burning off fat - and it even works on a high-fat diet.

One in five Americans visited ER in 2007

The New York Times: One in five Americans visited the emergency room in 2007 whether they were insured or not, according to data from the National Center for Health Statistics. "Among the uninsured, 7.4 percent made two or more visits to an E.R., but so did 5.1 percent of people with private insurance. Medicaid recipients were the heaviest users of E.R.'s, with 15.3 percent of them making two or more visits during the year.

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› Verified 2 days ago


Emergency Medicine Doctors in Walnut Creek, CA

Brook Andrew Woolley, M.D.
Emergency Medicine
Medicare: Medicare Enrolled
Practice Location: 1425 S Main St, Emergency Medicine Department, Walnut Creek, CA 94596
Phone: 925-295-5100    
Malcolm C Johnson, MD
Emergency Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 1601 Ygnacio Valley Rd, Walnut Creek, CA 94598
Phone: 925-939-3000    
Alice Decker Hunter, M.D.
Emergency Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 1601 Ygnacio Valley Rd, Walnut Creek, CA 94598
Phone: 925-939-3000    
Seigfred P. Jalalon, M.D.
Emergency Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 1450 Treat Blvd # 160, Walnut Creek, CA 94597
Phone: 925-296-9000    
Theodore Ira Kloth, M.D.
Emergency Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 1601 Ygnacio Valley Rd, Walnut Creek, CA 94598
Phone: 925-939-3000    
Stephanie Carlson, MD
Emergency Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 1425 S Main St, Walnut Creek, CA 94596
Phone: 925-295-4000    
Michael R. Lozano, MD
Emergency Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 1425 S Main St, Walnut Creek, CA 94596
Phone: 925-295-4000    

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