Doctor profile · Federal record
Dr. Justin Larson, M.D.
Emergency Medicine Physician (CMS: Emergency Medicine) · Cambridge, MA
- NPI 1821319393
- Accepts Medicare
- MIPS 81.3 / 100 · 2023
- 16 yrs in practice
- Male
- Solo practice
- No sanctions
Practice & contact
- Primary practice
-
1493 Cambridge St
Cambridge, MA 021391099
(617) 665-1000
Credentials & registration
- NPI registered
- June 2010 — 16 yrs on file
- Profile last updated
- December 20, 2020
- Year of graduation
- 2010 — 16 yrs since
- Specialty taxonomy
- 207P00000X — NUCC code
- State license (1)
- Massachusetts #266658
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1821319393. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
72
Distinct HCPCS
2
Medicare allowed
$11,088
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99284 |
Emergency department visit with moderate level of medical decision making | 37 | 36 | $126 | |
99285 |
Emergency department visit with high level of medical decision making | 35 | 33 | $183 |
In context: peer comparison
Among 18 peers in Cambridge Emergency Medicine Physician, average services per provider: 67. This provider delivers 1.1× the peer median.Hospital affiliations
Frequently asked questions
What is Dr. Justin Larson's medical specialty?
Dr. Justin Larson practices Emergency Medicine Physician in Cambridge, MA.
Where does Dr. Justin Larson practice?
Dr. Justin Larson practices at 1493 Cambridge St, Cambridge, MA 021391099. Office phone: 6176651000.
What is Dr. Justin Larson's NPI?
Dr. Justin Larson's National Provider Identifier (NPI) is 1821319393, issued by NPPES.
Does Dr. Justin Larson accept Medicare assignment?
Yes. Dr. Justin Larson accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Justin Larson commonly perform?
Top Medicare-reported procedures in 2023: Emergency department visit with moderate level of medical decision making (HCPCS 99284); Emergency department visit with high level of medical decision making (HCPCS 99285). Source: CMS Medicare Physician & Other Practitioners file.