Justin David Larson, MD - Medicare Emergency Medicine in Cambridge, MA

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Justin David Larson, MD is a medicare enrolled "Emergency Medicine" physician in Cambridge, Massachusetts. He went to Saint Louis University School Of Medicine and graduated in 2010 and has 16 years of diverse experience with area of expertise as Emergency Medicine. He is a member of the group practice Harvard Medical Faculty Phys At Beth Israel Deaconess Med Ctr Inc, Bid-milton Physician Associates Inc, Beth Israel Lahey Health Specialty Care, Inc. and his current practice location is 1493 Cambridge St, Cambridge, Massachusetts. You can reach out to his office (for appointments etc.) via phone at (617) 665-1000.

Justin David Larson is licensed to practice in Massachusetts (license number 266658) and he also participates in the medicare program. He accepts medicare assignments (which means he accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and his NPI Number is 1821319393.

Contact Information

Justin David Larson, MD
1493 Cambridge St,
Cambridge, MA 02139-1099
(617) 665-1000
Not Available

Map and Direction




Physician's Profile

Full NameJustin David Larson
GenderMale
SpecialityEmergency Medicine
Experience16 Years
Location1493 Cambridge St, Cambridge, Massachusetts
Accepts Medicare AssignmentsYes. He accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance.
  Medical Education and Training:
  • Justin David Larson attended and graduated from Saint Louis University School Of Medicine in 2010
  NPI Data:
  • NPI Number: 1821319393
  • Provider Enumeration Date: 06/18/2010
  • Last Update Date: 12/20/2020
  Medicare PECOS Information:
  • PECOS PAC ID: 7315163052
  • Enrollment ID: I20161130000335

Medical Identifiers

Medical identifiers for Justin David Larson such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1821319393NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207P00000XEmergency Medicine 266658 (Massachusetts)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Winchester HospitalWinchester, MAHospital
Mount Auburn HospitalCambridge, MAHospital
Beth Israel Deaconess Medical CenterBoston, MAHospital
Beth Israel Deaconess Hospital-milton IncMilton, MAHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Harvard Medical Faculty Phys At Beth Israel Deaconess Med Ctr Inc44865671041693
Bid-milton Physician Associates Inc741637539954
Beth Israel Lahey Health Specialty Care, Inc.2365405024264

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. Justin David Larson allows following entities to bill medicare on his behalf.
Entity NameHarvard Medical Faculty Phys at Beth Israel Deaconess Med Ctr Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1194765438
PECOS PAC ID: 4486567104
Enrollment ID: O20031204000918
Entity NameHarvard Medical Faculty Phys at Beth Israel Deaconess Med Ctr Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1316987993
PECOS PAC ID: 4486567104
Enrollment ID: O20040105000227
Entity NameAssociated Physicians of Harvard Medical Faculty Physicians at Beth Is
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1952358533
PECOS PAC ID: 6305749987
Enrollment ID: O20040130000354
Entity NameBeth Israel Lahey Health Specialty Care, Inc.
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1235147760
PECOS PAC ID: 2365405024
Enrollment ID: O20050111000265
Entity NameCambridge Public Health Commission
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1932313228
PECOS PAC ID: 8921910894
Enrollment ID: O20050808000725
Entity NameAssociated Physicians of Harvard Medical Faculty Physicians at Beth Is
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1952358533
PECOS PAC ID: 6305749987
Enrollment ID: O20130606000720
Entity NameBid-milton Physician Associates Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1164060778
PECOS PAC ID: 7416375399
Enrollment ID: O20200909000678

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. Justin David Larson 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
Justin David Larson, MD
1493 Cambridge St,
Cambridge, MA 02139-1099

Ph: (617) 665-1000		Justin David Larson, MD
1493 Cambridge St,
Cambridge, MA 02139-1099

Ph: (617) 665-1000

Reviews and Comments


Emergency Medicine Doctors in Cambridge, MA

Dr. Benjamin Kerman, MD
Emergency Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 330 Mount Auburn St, Cambridge, MA 02138
Phone: 617-499-5025    Fax: 617-864-0085
Manon Loonis,
Emergency Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 1493 Cambridge St, Cambridge, MA 02139
Phone: 617-665-1000    
Dr. Luis F Lobon, M.D., M.S.
Emergency Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 1493 Cambridge St, Cambridge, MA 02139
Phone: 617-665-1712    Fax: 617-665-3145
Allen Mario Poma, MD
Emergency Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 150 Vassal Ln, Cambridge, MA 02138
Phone: 617-714-5663    
Dr. Hannah Bach, M.D.
Emergency Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 1493 Cambridge St, Cambridge, MA 02139
Phone: 231-409-2511    
Benjamin T Milligan, M.D.
Emergency Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 1493 Cambridge St, Cambridge, MA 02139
Phone: 617-665-2113    
Dr. Todd Thomsen, MD
Emergency Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 330 Mount Auburn St, Emergency Dept, Cambridge, MA 02138
Phone: 617-499-5025    Fax: 617-864-0085

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.