Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Mark William Johnson, MD

Individual provider Diagnostic Radiology Physician · NPI 1316436793

Mark William Johnson, MD practises Diagnostic Radiology in Cambridge, Massachusetts. Graduated from University of Minnesota Medical School in 2018, 8 years ago. Practices with Dartmouth-Hitchcock Clinic, a 1,430-clinician group, works from 4 locations and accepts Medicare assignment. Licensed in Massachusetts and New Hampshire.

Years since qualifying
8
Trained at
University of Minnesota Medical School
Licensed in
MA, NH
In the registry since
2018
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

330 Mount Auburn St
Cambridge, MA 02138
Phone: (617) 492-3500
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (3)

  • 1 Medical Center Dr, Lebanon, NH 03756-0001 — (603) 650-5000
  • 10 Alice Peck Day Dr, Lebanon, NH 03766-2900 — (603) 448-3121
  • 273 County Rd, New London, NH 03257-5736 — (603) 526-2911

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 276370 (MA)
Diagnostic Radiology Physician Taxonomy 2085R0202X · Licence 33075 (NH)

Record details

NPI number1316436793
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMay 1, 2018
Last updated in NPPESJune 21, 2024
Certification dateJune 21, 2024

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyDIAGNOSTIC RADIOLOGY
Medical schoolUNIVERSITY OF MINNESOTA MEDICAL SCHOOL
Graduated 2018 (8 years in practice)
Group practice Dartmouth-Hitchcock Clinic — 1430 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients393
Services billed 533 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Dartmouth-Hitchcock Clinic

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 1430 clinicians in the practice; 12 are shown here.

Other providers in Cambridge