Quick answers
- Which hospitals does Justin Larson work at?
- Medicare's official clinician data lists Justin Larson at 4 hospitals: Beth Israel Deaconess Hospital - Milton, Beth Israel Deaconess Medical Center, Mount Auburn Hospital and Winchester Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Justin Larson see patients?
- Medicare's clinician data lists 4 practice locations, including Boston, MA, Milton, MA and Quincy, MA. Call before your visit to confirm the address.
- What is Justin Larson's specialty?
- Medicare lists Emergency Medicine as the primary specialty.
- Does Justin Larson accept Medicare assignment?
- Yes. Medicare's clinician data says Justin Larson accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Justin Larson?
- (781) 453-3000, as listed in official Medicare / NPI Registry data.
- What is Justin Larson's NPI number?
- 1821319393. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Justin Larson works
Medicare's Facility Affiliation Data lists Justin Larson at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Beth Israel Deaconess Hospital - MiltonMilton, MA · Acute Care Hospital · CCN 220108
- Beth Israel Deaconess Medical CenterBoston, MA · Acute Care Hospital · CCN 220086
- Mount Auburn HospitalCambridge, MA · Acute Care Hospital · CCN 220002
- Winchester HospitalWinchester, MA · Acute Care Hospital · CCN 220105
Practice locations
Addresses where Justin Larson is enrolled with Medicare (CMS data updated 2026-10-02).
- 1 Deaconess RdBoston, MA 02215 (781) 453‑3000
- 100 Highland StMilton, MA 02186 (617) 615‑4000
- 100 Walter J Hannon Pkwy, Suite 143Quincy, MA 02169 (617) 615‑4000
- 41 Mall RdBurlington, MA 01805
Group practices
Medicare enrollment lists Justin Larson as a member of these groups (CMS data updated 2026-10-02).
- Harvard Medical Faculty Phys at Beth Israel Deaconess Med Ctr Inc1,740 clinicians in the group
- Beth Israel Lahey Health Specialty Care, Inc.267 clinicians in the group
- Bid-Milton Physician Associates Inc53 clinicians in the group
Specialties
- Emergency Medicineprimary
Other emergency medicine doctors in Boston
Clinicians with the same Medicare primary specialty in Boston, MA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Saint Louis University School Of Medicine |
| Graduation year | 2010 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1821319393 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians