JUSTIN DAVID LARSON M.D.
NPI 1821319393
Emergency Medicine in Cambridge, MA

Q: What is Justin Larson's NPI number?

The NPI number for Justin Larson is 1821319393. It was assigned to this individual provider in the NPPES registry on June 18, 2010.

Q: What is Justin Larson's specialty?

The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.

Q: When was this NPI record last updated?

The NPPES record for Justin Larson was last updated on December 20, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 years 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.

Active since June 18, 2010PECOS EnrolledAccepts Medicare Assignment

86.26/100

CMS Quality Rating

1493 CAMBRIDGE ST, CAMBRIDGE, MA 02139(617) 665-1000 Get Directions Write a Review

NPPES record last updated: December 20, 2020. Verified against the NPPES registry weekly; last sync: August 02, 2026.

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About Justin David Larson M.d. NPPES

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

JUSTIN DAVID LARSON M.D. (NPI 1821319393) is an individual emergency medicine provider in Cambridge, Massachusetts, licensed in Massachusetts (266658) and active in the NPI registry since June 2010. He is enrolled in Medicare PECOS, is affiliated with Mount Auburn Hospital, and is a graduate of Saint Louis University School Of Medicine (2010).

NPPES Registry Identity

NPI1821319393

Entity TypeIndividualMale

Primary Taxonomy207P00000X

Provider Legal NameJUSTIN DAVID LARSONCredential: M.D.

Location Address1493 CAMBRIDGE STCambridge, MA 02139-1099

Mailing Address1493 Cambridge StCambridge, MA 02139-1099 · (617) 665-1000

Phone(617) 665-1000

Sole ProprietorYes

Medical School CMSSaint Louis University School Of MedicineGraduated 2010

Enumeration DateJune 18, 2010

Last NPPES UpdateDecember 20, 2020

NPPES CertifiedDecember 20, 2020

✔ NPI 1821319393 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyEmergency MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207P00000X

License✔ Licensed in MA · 266658

Definition

An emergency physician focuses on the immediate decision making and action necessary to prevent death or any further disability both in the pre-hospital setting by directing emergency medical technicians and in the emergency department. The emergency physician provides immediate recognition, evaluation, care, stabilization and disposition of a generally diversified population of adult and pediatric patients in response to acute illness and injury.

1493 CAMBRIDGE ST, Cambridge, MA 02139

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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Justin David Larson 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 ID7315163052

PECOS Enrollment IDI20161130000335

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.

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.

Emergency department visit with moderate level of medical decision making 99284

An emergency department visit for a high-severity issue means you're experiencing a serious health problem that needs immediate attention. This could be a severe injury, serious illness, or life-threatening condition. Medical professionals will provide urgent care to stabilize your condition.

26 services26 patients

Emergency department visit with high level of medical decision making 99285

An emergency department visit for severe conditions is when you urgently seek medical help due to serious health issues. These could be severe injuries, breathing problems, unbearable pain, or sudden severe illness. Doctors and nurses will provide immediate care to stabilize your condition.

21 services20 patients

Hospital Affiliations CMS Care Compare 5

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Mount Auburn Hospital

Acute Care Hospitals · Cambridge, MA

5/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number220002

Location330 Mount Auburn StreetCambridge, MA 02138 · Middlesex County

Emergency services Birthing friendly

Cambridge Health Alliance

Acute Care Hospitals · Cambridge, MA

3/5 CMS rating

OwnershipGovernment - Local

CMS Certification Number220011

Location1493 Cambridge StreetCambridge, MA 02138 · Middlesex County

Emergency services Birthing friendly

Beth Israel Deaconess Medical Center

Acute Care Hospitals · Boston, MA

4/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number220086

Location330 Brookline AvenueBoston, MA 02215 · Suffolk County

Emergency services Birthing friendly

Winchester Hospital

Acute Care Hospitals · Winchester, MA

4/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number220105

Location41 Highland AvenueWinchester, MA 01890 · Middlesex County

Emergency services Birthing friendly

Beth Israel Deaconess Hospital - Milton

Acute Care Hospitals · Milton, MA

4/5 CMS rating

OwnershipGovernment - Federal

CMS Certification Number220108

Location199 Reedsdale RoadMilton, MA 02186 · Norfolk County

Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 02139 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

$97.64 typical visit price

range $63.72 – $189.86

Typical copayment $24.41 (range $15.93 – $47.46)

Most-billed visit code 99203

Established Patient

$111.18 typical visit price

range $21.07 – $155.29

Typical copayment $27.79 (range $5.26 – $38.82)

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.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

86.26/100

MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program

Scored as part of a group practice

Quality

78.84

Promoting Interoperability

100

Improvement Activities

Cost

58.7

Other Providers at the Same Location NPPES 20

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

ZACHARY OLIFF DO

Emergency Medicine