Dr. Johnathon Toma Markus, MD
- Medicare services, 2024
- 453
- Medicare patients, 2024
- 363
- Part D claims, 2024
- 1,633
- MIPS score, 2024
- 100
- Hospital affiliations
- 1
- Practice address
- 37399 Garfield Rd, Clinton Twp, MI 48036
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Tri County Center for Endoscopy & Surgery - HOPD
Acute Care Hospital outpatient department · Clinton Twp, Michigan
Find Dr. Markus' professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Johnathon Toma Markus is a hospitalist in Clinton Twp, Michigan
Dr. Markus practices at Tri County Center for Endoscopy & Surgery - HOPD in Clinton Twp, Michigan.
Dr. Markus' NPI, 1548521461, was assigned on June 6, 2012. Dr. Markus graduated from Wayne State University School of Medicine in 2012. Dr. Markus holds Michigan license 4301106661.
- NPI
- 1548521461NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4082903042
- NPI enumeration date
- June 6, 2012
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 40
- Medical school graduation
- 2012
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Johnathon Toma Markus practices at Tri County Center for Endoscopy & Surgery - HOPD in Clinton Twp, Michigan
Dr. Markus' primary practice is Tri County Center for Endoscopy & Surgery - HOPD, at 37399 Garfield Rd, Clinton Twp, MI 48036.
- Tri County Center for Endoscopy & Surgery - HOPD37399 Garfield Rd, Clinton Twp, MI 48036
Source: Dmand AI Affiliation Data
Dr. Johnathon Toma Markus is affiliated with 4 sites of care and 2 medical groups
Dr. Markus' primary practice is Tri County Center for Endoscopy & Surgery - HOPD in Clinton Twp, Michigan. Dr. Markus is also affiliated with McLaren Macomb. The medical group on file is Tri-County Gastroenterology. Dmand AI also links Dr. Markus to 1 more group practice or clinic, 1 ambulatory surgery center and 1 medical group, each named with a free account.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Johnathon Toma Markus' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Markus practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Tri County Center for Endoscopy & Surgery - HOPD | Available with a free account |
| +3 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across each health system and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Johnathon Toma Markus is one of 256 hospitalists in Michigan
Hospitalist is Dr. Markus' primary specialty in the NPI Registry, under taxonomy code 208M00000X. Dr. Markus is licensed in Michigan.
Specialties and state licenses
- Hospitalist, MichiganPrimary
Hospitalists near Dr. Markus
Counts of hospitalists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Johnathon Toma Markus billed Medicare for 453 services in 2024
CMS data shows 453 Medicare services from Dr. Markus across 9 procedure codes in 2024, for 363 Medicare patients. Medicare paid $51,289 for them.
Dr. Markus' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 2262024: 2479%
- Surgery
- 2023: 2342024: 20612%
Where Dr. Markus' Medicare services took place, 2024
- In an office8318%
- In a facility37082%
Dr. Markus compared with the Michigan median for hospitalists, 2024
- Dr. Markus
- Michigan median
- Medicare services
- 453vs 37022% above
- Medicare patients
- 363vs 1702.1 times
- Part D claims
- 1,385vs 7019.8 times
Medians across 243 hospitalists in Michigan with Dmand AI profiles that report each measure.
Dr. Markus' most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Markus?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Markus and other hospitalists in Michigan.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Johnathon Toma Markus treated 363 Medicare patients in 2024, average age 71
CMS counts 363 Medicare patients who saw Dr. Markus in 2024. The largest group is 65 to 74, with 159 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 22% are also on Medicaid. Their average risk score is 1.73, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Markus' median patient age at 58, with 53% women.
Dr. Markus' Medicare patients by age, 2024
Dr. Markus' Medicare patients by sex, 2024
- Women20055%
- Men16345%
Chronic conditions among Dr. Markus' Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis53%
- Ischemic heart disease46%
- Diabetes42%
- Chronic kidney disease38%
- Anxiety36%
- COPD36%
Share of Medicare patients with each condition. A patient can have several.
Dr. Markus' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 58
Patient panel by sex, all payers
- Women53%
- Men46%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Johnathon Toma Markus wrote 1,633 Medicare Part D claims in 2024
In 2024, Dr. Markus wrote 1,633 Medicare Part D claims for 513 patients. 75% of them were for generic drugs. CMS names the drug for 1,385 of them, across 31 drugs with 11 or more claims each, at $954,912 in total drug cost. In 2023, CMS named 1,412 claims across 35 drugs.
Dr. Markus' Part D claims by kind of drug, 2024
- Generic1,218 claims75%
- Brand-name and other415 claims25%
Dr. Markus' most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Markus' Part D claims, 2024
- Antibiotics4%71 of 1,633 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1,4122024: 1,3852%
Drugs named by CMS: 31 in 2024, 35 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Johnathon Toma Markus scored 100 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 100 out of 100 for Dr. Markus for performance year 2024, reported as part of a group. Dr. Markus accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Markus as offering telehealth. CMS counts 122 procedures of colonoscopy by Dr. Markus, more than 84% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Dr. Markus' MIPS scores, performance year 2024
- 100of 100Final score
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Where Dr. Markus ranks in Medicare procedure volume
- Colonoscopy
- 84th percentile122 procedures
- Upper gastrointestinal (GI) endoscopy for acid reflux
- 80th percentile116 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Sources: Doctors and Clinicians National Downloadable File (CMS); Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026; and Doctors and Clinicians Utilization Data (CMS)
For MedTech and pharma teams
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Dr. Johnathon Toma Markus received $18,021 in industry payments from 2016 to 2025
CMS Open Payments shows 958 general payments to Dr. Markus from 48 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 98% of the total. Abbvie Inc. paid the most, $4,707.
General payments to Dr. Markus by program year, 2016 to 2025
General payments to Dr. Markus by kind, 2016 to 2025
- Food and beverage$17,67198%
- Education$2601%
- Gifts$900%
Companies that paid Dr. Markus the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Johnathon Toma Markus graduated from Wayne State University School of Medicine
Dr. Markus graduated from Wayne State University School of Medicine in 2012.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Johnathon Toma Markus's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Johnathon Toma Markus
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Johnathon Toma Markus' NPI number?
Dr. Johnathon Toma Markus' NPI number is 1548521461. It was assigned on June 6, 2012, and it is active in the NPI Registry.
What kind of doctor is Dr. Johnathon Toma Markus?
Dr. Johnathon Toma Markus is a hospitalist in Clinton Twp, Michigan. The primary specialty in the NPI Registry is Hospitalist Physician (taxonomy code 208M00000X).
Where does Dr. Johnathon Toma Markus practice?
Dr. Markus practices at 37399 Garfield Rd, Clinton Twp, MI 48036. Dr. Markus' primary practice is Tri County Center for Endoscopy & Surgery - HOPD in Clinton Twp, Michigan. Dmand AI also links Dr. Markus to 1 group practice or clinic, 1 ambulatory surgery center and 1 medical group.
What is Dr. Johnathon Toma Markus' medical license number?
Dr. Markus holds Michigan license 4301106661.
Which hospitals is Dr. Johnathon Toma Markus affiliated with?
Dr. Markus is affiliated with McLaren Macomb.
What medical group is Dr. Johnathon Toma Markus part of?
Dr. Markus is linked to Tri-County Gastroenterology. Dmand AI links Dr. Markus to 1 more medical group.
Does Dr. Johnathon Toma Markus accept Medicare?
Yes. CMS data shows Dr. Markus billed Medicare for 453 services in 2024, and Dr. Markus accepts Medicare assignment.
Does Dr. Johnathon Toma Markus offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Markus as offering telehealth services.
What is Dr. Johnathon Toma Markus' MIPS score?
Dr. Markus' MIPS final score for performance year 2024 is 100 out of 100, reported as part of a group.
How many Medicare patients does Dr. Johnathon Toma Markus see?
CMS counts 363 Medicare patients who saw Dr. Markus in 2024, with an average age of 71.
Show 5 more questionsShow fewer questions
What services does Dr. Johnathon Toma Markus bill to Medicare?
In 2024, Dr. Markus' most billed Medicare services were surgery: digestive system (45385), hospital inpatient care (99231) and surgery: digestive system (43239).
Where did Dr. Johnathon Toma Markus go to medical school?
Dr. Markus graduated from Wayne State University School of Medicine in 2012.
What drugs does Dr. Johnathon Toma Markus prescribe most?
In 2024 Medicare Part D data, Dr. Markus' most prescribed drugs by claims were Pantoprazole Sodium, Gavilyte-G and Linzess.
Has Dr. Johnathon Toma Markus received payments from drug or device companies?
CMS Open Payments shows $18,021 in general payments to Dr. Markus from 48 companies from 2016 to 2025. The largest total came from Abbvie Inc.
How long has Dr. Johnathon Toma Markus been practicing?
Dr. Markus graduated from medical school in 2012, 14 years ago.
Selling to hospitalist practices?
See hospitalists in Michigan by site of care and group
Find the practices, groups and hospitals they work with, and the right people to contact at each.
- 30 days free
- Self-serve
- No credit card