Quick answers
- Which hospitals does Johnathon T. Markus work at?
- Medicare's official clinician data lists Johnathon T. Markus at 1 hospital: McLaren Macomb. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Johnathon T. Markus see patients?
- Medicare's clinician data lists 1 practice location in Clinton Twp, MI. Call before your visit to confirm the address.
- What is Johnathon T. Markus's specialty?
- Medicare lists Gastroenterology as the primary specialty, and also Internal Medicine.
- Does Johnathon T. Markus accept Medicare assignment?
- Yes. Medicare's clinician data says Johnathon T. Markus accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- Does Johnathon T. Markus offer telehealth?
- Medicare's clinician data says Johnathon T. Markus offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Johnathon T. Markus?
- (586) 286-5400, as listed in official Medicare / NPI Registry data.
- What is Johnathon T. Markus's NPI number?
- 1548521461. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Johnathon T. Markus works
Medicare's Facility Affiliation Data lists Johnathon T. Markus at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- McLaren MacombMount Clemens, MI · Acute Care Hospital · CCN 230227
Practice locations
Addresses where Johnathon T. Markus is enrolled with Medicare (CMS data updated 2026-10-02).
- 37399 Garfield, Suite 104Clinton Twp, MI 48036 (586) 286‑5400
Group practices
Medicare enrollment lists Johnathon T. Markus as a member of this group (CMS data updated 2026-10-02).
- Tri-County Gastroenterology, PC9 clinicians in the group
Specialties
- Gastroenterologyprimary
- Internal Medicinealso
Other gastroenterologists in Clinton Twp
Clinicians with the same Medicare primary specialty in Clinton Twp, MI — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Wayne State University School Of Medicine |
| Graduation year | 2012 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1548521461 |
| 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 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- 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