Quick answers
- Does Marc T. Johannsen accept Medicare assignment?
- Yes. Medicare's clinician data says Marc T. Johannsen accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Marc T. Johannsen see?
- In 2024, CMS data shows 535 Original Medicare patients and 1,609 services for Marc T. Johannsen. This counts Original Medicare only and measures volume, not quality.
- What is Marc T. Johannsen's NPI number?
- 1538329644. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Marc T. Johannsen, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 535 |
|---|---|
| Services billed to Medicare | 1,609 |
| Different services or procedures | 75 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Low osmolar contrast material, 300-399 mg/ml iodine concentration, per ml (Q9967)910 services
- X-ray of chest, 1 view (71045)146 services
- Ct scan head or brain without contrast (70450)57 services
- X-ray of chest, 2 views (71046)37 services
- Ct scan of chest without contrast (71250)30 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Arthritis55%
- Ischemic heart disease50%
- Chronic kidney disease43%
- Diabetes38%
Hospitals where Marc T. Johannsen works
Medicare's Facility Affiliation Data lists Marc T. Johannsen at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Flagler HospitalSaint Augustine, FL · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 100090
- Orlando HealthOrlando, FL · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 100006
- Orlando Health Sebastian River HospitalSebastian, FL · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 100217
- Orlando Health South Lake HospitalClermont, FL · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 100051
- Orlando Health St Cloud HospitalSaint Cloud, FL · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 100302
Practice locations
Addresses where Marc T. Johannsen is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 8; the Medicare profile lists all.
- 101 Health Park BlvdSt Augustine, FL 32086 (904) 819‑4707
- 1041 Dunlawon AvePort Orange, FL 32127 (386) 274‑7118
- 1414 Kuhl AveOrlando, FL 32806 (407) 841‑5111
- 157 Kapalua PlSt Johns, FL 32259 (352) 671‑4300
- 1752 Eagle Watch DrFleming Island, FL 32003 (386) 274‑7118
Group practices
Medicare enrollment lists Marc T. Johannsen as a member of these groups (CMS data updated October 2, 2026).
- Orlando Health Medical Group Inc2,287 clinicians in the group
- Radiology Imaging Associates LLC190 clinicians in the group
- Ohri LLC154 clinicians in the group
- Inverness Medical Imaging LLC84 clinicians in the group
- East Central Florida Outpatient Imaging LLC45 clinicians in the group
Specialties
- Diagnostic Radiologyprimary
Other radiologists in St Augustine
Clinicians with the same Medicare primary specialty in St Augustine, FL — not a recommendation.
Other clinicians in Orlando Health Medical Group Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Medical school | Philadelphia College Of Osteopathic Medicine |
| Graduation year | 2008 (18 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1538329644 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians