Physician Profile
Unclaimed ProfileAbout MARKUS
Johnathon Toma Markus, M.D. is a healthcare provider in Clinton Twp, MI specialising in gastroenterology. Johnathon trained at Wayne State University School of Medicine, graduating in 2012. Johnathon is also listed as specialising in student in an organized health care education program.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Areas of Expertise
Common questions
What does Dr. Markus specialise in?
Dr. Markus is a gastroenterology in Clinton Twp, MI. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “GASTROENTEROLOGY”.
NPI registry
Where is Dr. Markus located?
Dr. Markus is listed at 37399 GARFIELD RD STE 104, Clinton Twp, MI 48036. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Dr. Markus's phone number?
The number on file is (586) 569-3379. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is the NPI for Dr. Markus?
Dr. Markus's National Provider Identifier is 1548521461. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Dr. Markus go to medical school?
Dr. Markus attended Wayne State University School of Medicine, graduating in 2012. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Dr. Markus have?
Dr. Markus has 14 years experience. Calculated from a graduation year of 2012, reported in the CMS National Downloadable File.
CMS public data
What does Dr. Markus do most often?
According to Medicare billing data, Dr. Markus performs procedures including removal of polyps or growths of large bowel using an endoscope with mechanical snare, biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope and biopsy of large bowel using a flexible endoscope, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Dr. Markus's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Markus. If this is you, claiming it is free.
Guide.md
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (586) 569-3379
- Email not available
Practice Locations
37399 GARFIELD RD STE 104
Clinton Twp, MI 48036
Procedures Most Often Billed to Medicare
453 services · 427 patients · 9 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Removal of polyps or growths of large bowel using an endoscope with mechanical snare | Procedure | 45385 |
90 |
| Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | Procedure | 43239 |
73 |
| Biopsy of large bowel using a flexible endoscope | Procedure | 45380 |
31 |
| Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope | Procedure | 43235 |
12 |
| Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes | Office visit | 99231 |
80 |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
62 |
| Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | Office visit | 99223 |
48 |
| Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | Office visit | 99222 |
36 |
| New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more | Office visit | 99203 |
21 |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Is this your profile?
Verify your identity to control how patients — and AI assistants — describe you.
Claim this profileRelated providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other gastroenterology specialists at this location 1
Same specialty, same street address — most likely the same department or group.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Other gastroenterology specialists in Clinton Twp 1
Same specialty, same city.
More connections — 24 related providers in 3 groups
Trained at Wayne State University School of Medicine 8
Other providers in the same specialty who trained at the same institution.
Class of 2012 at Wayne State University School of Medicine 8
Providers who graduated from the same medical school in the same year.
Also performs Removal of polyps or growths of large bowel using an endoscope with mechanical snare 8
Providers in MI who bill this service to Medicare most often.
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.