Marc Johannsen, D.O.
NPI 1538329644 · Diagnostic Radiology Physician · Portsmouth, VA
Enrolled with Medicare as Practitioner - Diagnostic Radiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marc Johannsen, D.O. is a Diagnostic Radiology Physician provider in Portsmouth, VA (NPI 1538329644).
Provider details
- NPI number
- 1538329644
- Entity type
- Individual
- Primary specialty
- Diagnostic Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- Yes
- License
- OS15809 (FL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
18 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
430 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 | 146 | $8 |
| Ct Scan Head Or Brain Without Contrast70450 | 57 | $38 |
| Ct Scan of Abdomen and Pelvis With Contrast74177 | 25 | $83 |
| X-Ray of Chest, 2 Views71046 | 21 | $32 |
| Ct Scan of Abdomen and Pelvis Without Contrast74176 | 21 | $80 |
| Ct Scan of Upper Spine Without Contrast72125 | 19 | $45 |
Practice location
Mailing address
Additional practice locations (1)
- 52 W Underwood StOrlando, FL 32806-1110Phone: (321) 842-8475
Registry dates
- Enumerated
- 2008-06-11
- Last updated
- 2023-03-28
- Certified
- 2023-03-28
Frequently asked questions
- What is Marc Johannsen's NPI number?
- Marc Johannsen's National Provider Identifier (NPI) is 1538329644, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marc Johannsen's specialty?
- Marc Johannsen is listed in the NPPES registry with a primary specialty of Diagnostic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is Marc Johannsen located?
- Marc Johannsen's practice location on file with NPPES is 620 John Paul Jones Cir, Portsmouth, VA 23708-2111.
- What is Marc Johannsen's phone number?
- The practice phone number listed in the NPPES registry for Marc Johannsen is (757) 953-5000.
- Does Marc Johannsen accept Medicare?
- Marc Johannsen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Marc Johannsen's NPI active?
- Yes — Marc Johannsen's NPI (1538329644) is active in the NPPES registry as of the last update on 2023-03-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.