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Edit this profileAt a glance
- 37399 Garfield Rd Ste 104, Clinton Township, MI 48036
About Dr. Markus
Johnathon T. Markus, M.D. is a healthcare provider in Clinton Township, MI specializing in gastroenterology. Johnathon trained at Wayne State University School of Medicine, graduating in 2012. Johnathon is also listed as specializing in student in an organized health care education program. Medicare claims data shows Johnathon provided 453 services to 427 patients. The services billed most often include removal of polyps or growths of large bowel using an endoscope with mechanical snare, subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes, and biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope. This provider record is associated with NPI 1548521461.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (586) 569-3379
- Email not available
Practice Locations
37399 GARFIELD RD STE 104
Clinton Township, MI 48036
Conditions Commonly Evaluated or Treated
Within Gastroenterology generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Most searched conditions
- Acid reflux
- Celiac disease
- Crohn's disease
- Hemorrhoids
- IBS
- Swallowing difficulties
- Ulcerative colitis
Biliary and pancreas
Colon and anorectal
Esophagus and swallowing
Functional bowel and motility
Liver
- Ascites
- Autoimmune hepatitis
- Cirrhosis
- Fatty liver disease
- Hemochromatosis
- Hepatitis B
- Hepatitis C
- Portal hypertension
Stomach and duodenum
Bowel & Colon
Digestive Symptoms
Gallbladder & Bile Ducts
Procedures & services
Most searched procedures
Lower endoscopy
Upper endoscopy
Capsule and physiology testing
Diagnostic Testing
Liver procedures
Treatments
Procedures Most Often Billed to Medicare
453 services · 427 patients · 9 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Removal of polyps or growths of large bowel using an endoscope with mechanical snare | Procedure | 45385 |
90 | More often than most peers in Gastroenterology |
| Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | Procedure | 43239 |
73 | As often as other peers in Gastroenterology |
| Biopsy of large bowel using a flexible endoscope | Procedure | 45380 |
31 | As often as other peers in Gastroenterology |
| Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope | Procedure | 43235 |
12 | Less often than most peers in Gastroenterology |
| 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 | More often than most peers in Gastroenterology |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
62 | As often as other peers in Gastroenterology |
| Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | Office visit | 99223 |
48 | More often than most peers in Gastroenterology |
| Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | Office visit | 99222 |
36 | As often as other peers in Gastroenterology |
| 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 | As often as other peers in Gastroenterology |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other gastroenterologists at this location 7
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 gastroenterologists in Clinton Township 4
Same specialty, same city.
More connections — 23 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 7
Providers in MI who bill this service to Medicare most often.
Common questions
What does Johnathon T. Markus specialize in?
Johnathon T. Markus is a gastroenterologist in Clinton Township, MI. That is the designation recorded for this NPI in the federal registry, where it is listed as “Gastroenterology”.
NPI registry
Where is Johnathon T. Markus located?
Johnathon T. Markus is listed at 37399 Garfield Rd Ste 104, Clinton Township, MI 48036. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Johnathon T. Markus's phone number?
The number on file is (586) 569-3379. Contact the office directly to confirm availability and scheduling.
NPI registry
What is the NPI for Johnathon T. Markus?
Johnathon T. 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 Johnathon T. Markus train?
Johnathon T. 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 Johnathon T. Markus have?
Johnathon T. Markus has 14 years experience. Calculated from a graduation year of 2012, reported in the CMS National Downloadable File.
CMS public data
What does Johnathon T. Markus do most often?
According to Medicare billing data, Johnathon T. 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 Johnathon T. Markus's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Johnathon T. Markus. If this is you, claiming it is free.
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