Physician Profile
Unclaimed ProfileAbout LARSON
Justin David Larson, M.D. is a healthcare provider in Cambridge, MA specializing in emergency medicine. Justin trained at Saint Louis University School of Medicine, graduating in 2010. Medicare claims data shows Justin provided 47 services to 46 patients.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Areas of Expertise
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (617) 665-1000
- Email not available
Practice Locations
1493 CAMBRIDGE ST
Cambridge, MA 02139
Procedures Most Often Billed to Medicare
47 services · 46 patients · 2 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Emergency department visit with moderate level of medical decision making | Office visit | 99284 |
26 |
| Emergency department visit with high level of medical decision making | Office visit | 99285 |
21 |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other emergency medicines at this location 2
Same specialty, same street address — most likely the same department or group.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Other emergency medicines in Cambridge 6
Same specialty, same city.
More connections — 16 related providers in 2 groups
Trained at Saint Louis University School of Medicine 8
Other providers in the same specialty who trained at the same institution.
Class of 2010 at Saint Louis University School of Medicine 8
Providers who graduated from the same medical school in the same year.
Common questions
What does Dr. Larson specialize in?
Dr. Larson is an emergency medicine in Cambridge, MA. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “EMERGENCY MEDICINE”.
NPI registry
Where is Dr. Larson located?
Dr. Larson is listed at 1493 CAMBRIDGE ST, Cambridge, MA 02139. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Dr. Larson's phone number?
The number on file is (617) 665-1000. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is the NPI for Dr. Larson?
Dr. Larson's National Provider Identifier is 1821319393. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Dr. Larson go to medical school?
Dr. Larson attended Saint Louis University School of Medicine, graduating in 2010. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Dr. Larson have?
Dr. Larson has 16 years experience. Calculated from a graduation year of 2010, reported in the CMS National Downloadable File.
CMS public data
What does Dr. Larson do most often?
According to Medicare billing data, Dr. Larson the Medicare record under this individual NPI shows mainly office visits and diagnostic testing. Hospital-based physicians usually have their procedural work billed by the facility rather than under their own number, so this is a floor on their practice, not a description of it. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Dr. Larson's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Larson. If this is you, claiming it is free.
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Claim this profileProvider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.