MARK WILLIAM JOHNSON MD
NPI 1316436793
Internal Medicine in Cambridge, MA
About Mark William Johnson Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARK WILLIAM JOHNSON MD (NPI 1316436793) is an individual internal medicine provider in Cambridge, Massachusetts, licensed in Massachusetts (276370) and active in the NPI registry since May 2018. He is enrolled in Medicare PECOS, is affiliated with Mary Hitchcock Memorial Hospital, and maintains 3 additional practice locations.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Locations 3
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Mark William Johnson Md 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.
Medicare Billing Reassignments
3Medicare enrollment records show Mark Johnson reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Hampstead, NH 03841
- Reassigned Medicare billing, New Hampshire enrollment
- 2,620 clinicians in this Medicare group
Keene, NH 03431
- Reassigned Medicare billing, New Hampshire and Vermont enrollments
- Also billed through NPI 1548210198 (Vermont)
- 2,999 clinicians in this Medicare group
Bismarck, ND 58501
- Reassigned Medicare billing, North Dakota enrollment
- 616 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 8
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.
Hospital Affiliations CMS Care Compare 5
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Mary Hitchcock Memorial Hospital
Acute Care Hospitals · Lebanon, NHNew London Hospital
Critical Access Hospitals · New London, NHHuggins Hospital
Critical Access Hospitals · Wolfeboro, NHCopley Hospital
Critical Access Hospitals · Morrisville, VTSpringfield Hospital
Critical Access Hospitals · Springfield, VTPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 02138 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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.
CAMBRIDGE, MA 02138
CAMBRIDGE, MA 02138
CAMBRIDGE, MA 02138
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Mark Johnson's NPI number?
The NPI number for Mark Johnson is 1316436793. It was assigned to this individual provider in the NPPES registry on May 1, 2018.
Where is Mark Johnson located?
Mark Johnson practices at 330 Mount Auburn St, Cambridge, MA 02138. The listed phone number is (617) 492-3500.
What is Mark Johnson's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Mark Johnson enrolled in Medicare?
Yes. Mark Johnson is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Mark Johnson's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mark Johnson reassigns Medicare benefits to 3 organizations: Mary Hitchcock Memorial Hospital (Hampstead, NH), Dartmouth-Hitchcock Clinic (Keene, NH) and St. Alexius Medical Center (Bismarck, ND). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Mark Johnson's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Mark Johnson accept?
Health plans from Anthem Blue Cross and Blue Shield list Mark Johnson as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Mark Johnson affiliated with any hospitals?
According to CMS data, Mark Johnson is affiliated with Mary Hitchcock Memorial Hospital, New London Hospital, Huggins Hospital, Copley Hospital and Springfield Hospital.
When was this NPI record last updated?
The NPPES record for Mark Johnson was last updated on June 21, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.
# Mark William Johnson, MD · NPI 1316436793
Internal Medicine physician in Cambridge, Massachusetts. Individual provider, active in the CMS NPPES registry since May 1, 2018.
## Identity
- **NPI:** 1316436793 (Entity type: Individual)
- **Enumerated:** May 1, 2018
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 276370 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 330 MOUNT AUBURN ST, Cambridge, MA 02138
- **Phone:** (617) 492-3500
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 3 organizations under Medicare reassignment (form CMS-855R): Mary Hitchcock Memorial Hospital (NPI 1699584219, Hampstead, NH); Dartmouth-Hitchcock Clinic (NPI 1174176861, Keene, NH); St. Alexius Medical Center (NPI 1629121074, Bismarck, ND) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Minnesota Medical School, class of 2018
## Record status
- **NPPES last updated:** June 21, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1316436793) · Data from the CMS NPPES public registry.