Mark Johnson, MD
NPI 1316436793 · Internal Medicine Physician · Cambridge, MA
Enrolled with Medicare as Practitioner - Diagnostic Radiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Johnson, MD is a Internal Medicine Physician provider in Cambridge, MA (NPI 1316436793).
Provider details
- NPI number
- 1316436793
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 33075 (NH)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
8 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
4 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
347 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| X-Ray of Chest, 1 View71045 | 99 | $8 |
| Screening 3d Breast Mammography77063 | 64 | $27 |
| Screening Mammography77067 | 64 | $34 |
| X-Ray of Chest, 2 Views71046 | 56 | $10 |
| Ct Scan of Abdomen and Pelvis With Contrast74177 | 22 | $84 |
| Ct Scan of Chest With Contrast71260 | 17 | $52 |
Practice location
Mailing address
Additional practice locations (3)
- 10 Alice Peck Day DrLebanon, NH 03766-2900Phone: (603) 448-3121
- 1 Medical Center DrLebanon, NH 03756-0001Phone: (603) 650-5000
- 273 County RdNew London, NH 03257-5736Phone: (603) 526-2911
Registry dates
- Enumerated
- 2018-05-01
- Last updated
- 2024-06-21
- Certified
- 2024-06-21
Frequently asked questions
- What is Mark Johnson's NPI number?
- Mark Johnson's National Provider Identifier (NPI) is 1316436793, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Johnson's specialty?
- Mark Johnson is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Johnson located?
- Mark Johnson's practice location on file with NPPES is 330 Mount Auburn St, Cambridge, MA 02138.
- What is Mark Johnson's phone number?
- The practice phone number listed in the NPPES registry for Mark Johnson is (617) 492-3500.
- Does Mark Johnson accept Medicare?
- Mark Johnson is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Johnson's NPI active?
- Yes — Mark Johnson's NPI (1316436793) is active in the NPPES registry as of the last update on 2024-06-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.