Dr. Markus George Zei, MD
- Medicare services, 2024
- 3,199
- Medicare patients, 2024
- 2,767
- Hospital affiliations
- 5
- Industry payments
- $179
- Medical groups
- 5
- Practice address
- 1404 Cross St, O'Fallon, IL 62269
- Practice phone
- Call (618) 257-5607
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Memorial Hospital - Shiloh
O'Fallon, Illinois
Find Dr. Zei's professional email, personal email and mobile number
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Dr. Markus George Zei is a diagnostic radiologist in O'Fallon, Illinois
Dr. Zei practices at Memorial Hospital - Shiloh in O'Fallon, Illinois.
Dr. Zei's NPI, 1164803953, was assigned on June 17, 2015. Dr. Zei graduated from Saint Louis University School of Medicine in 2015. Dr. Zei holds Missouri license 2019035073.
- NPI
- 1164803953NPI Registry (opens in a new tab)
- Medicare PAC ID
- 7618279431
- NPI enumeration date
- June 17, 2015
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (618) 257-5607
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 37
- Medical school graduation
- 2015
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Markus George Zei practices at Memorial Hospital - Shiloh in O'Fallon, Illinois
Dr. Zei's primary practice is Memorial Hospital - Shiloh, at 1404 Cross St, O'Fallon, IL 62269 in Saint Clair County. The practice phone is (618) 257-5607.
- Memorial Hospital - Shiloh1404 Cross St, O'Fallon, IL 62269 · Saint Clair CountyPhone(618) 257-5607
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Markus George Zei is affiliated with 11 sites of care and 5 medical groups
Dr. Zei's primary practice is Memorial Hospital - Shiloh in O'Fallon, Illinois. Dr. Zei is also affiliated with Missouri Baptist Medical Center. The medical group on file is WashU Medicine Psychiatry. Dmand AI also links Dr. Zei to 4 more hospitals, 5 group practices and clinics and 4 medical groups, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Markus George Zei's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Zei practices, 10 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Memorial Hospital - Shiloh | Available with a free account |
| +10 more sites and 4 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Markus George Zei is one of 1,336 diagnostic radiologists in Illinois
Diagnostic radiology is Dr. Zei's primary specialty in the NPI Registry, under taxonomy code 2085R0202X. Dr. Zei is licensed in Missouri.
Specialties and state licenses
- Diagnostic radiology, MissouriPrimary
Diagnostic radiologists near Dr. Zei
Counts of diagnostic radiologists 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. Markus George Zei billed Medicare for 3,199 services in 2024
CMS data shows 3,199 Medicare services from Dr. Zei across 52 procedure codes in 2024, for 2,767 Medicare patients. Medicare paid $86,307 for them.
Dr. Zei's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Imaging
- 2023: 3,2502024: 3,1304%
- Tests and treatments
- 2023: 242024: 4171%
- Surgery
- 2023: 342024: 2818%
- Other services
- 2023: 592024: 0100%
Where Dr. Zei's Medicare services took place, 2024
- In an office171%
- In a facility3,18299%
Dr. Zei compared with the Illinois median for diagnostic radiologists, 2024
- Dr. Zei
- Illinois median
- Medicare services
- 3,199vs 2,57524% above
- Medicare patients
- 2,767vs 1,83651% above
Medians across 1,261 diagnostic radiologists in Illinois with Dmand AI profiles that report each measure.
Dr. Zei's 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.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Zei and other diagnostic radiologists in Illinois.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Markus George Zei treated 2,767 Medicare patients in 2024, average age 75
CMS counts 2,767 Medicare patients who saw Dr. Zei in 2024. The largest group is 65 to 74, with 1,029 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 23% are also on Medicaid. Their average risk score is 1.78, 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. Zei's median patient age at 71, with 59% women.
Dr. Zei's Medicare patients by age, 2024
Dr. Zei's Medicare patients by sex, 2024
- Women1,61558%
- Men1,15242%
Chronic conditions among Dr. Zei's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis66%
- Ischemic heart disease45%
- Diabetes40%
- Anxiety37%
- Chronic kidney disease37%
- COPD35%
Share of Medicare patients with each condition. A patient can have several.
Dr. Zei's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 71
Patient panel by sex, all payers
- Women59%
- Men40%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
How Dr. Markus George Zei takes part in Medicare
Dr. Zei accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Markus George Zei received $179 in industry payments in 2016
CMS Open Payments shows 11 general payments to Dr. Zei from 8 drug and device companies in 2016. Food and beverage make up the largest share, 100% of the total. Gilead Sciences, Inc. paid the most, $31.
Companies that paid Dr. Zei the most, 2016 to 2016
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Markus George Zei graduated from Saint Louis University School of Medicine
Dr. Zei graduated from Saint Louis University School of Medicine in 2015.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Markus George Zei'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand 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) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (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. Markus George Zei
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. Markus George Zei's NPI number?
Dr. Markus George Zei's NPI number is 1164803953. It was assigned on June 17, 2015, and it is active in the NPI Registry.
What kind of doctor is Dr. Markus George Zei?
Dr. Markus George Zei is a diagnostic radiologist in O'Fallon, Illinois. The primary specialty in the NPI Registry is Diagnostic Radiology Physician (taxonomy code 2085R0202X).
Where does Dr. Markus George Zei practice?
Dr. Zei practices at 1404 Cross St, O'Fallon, IL 62269. Dr. Zei's primary practice is Memorial Hospital - Shiloh in O'Fallon, Illinois. Dmand AI also links Dr. Zei to 4 hospitals, 5 group practices and clinics and 4 medical groups.
What is Dr. Markus George Zei's office phone number?
The practice phone on file for Dr. Zei is (618) 257-5607.
What is Dr. Markus George Zei's medical license number?
Dr. Zei holds Missouri license 2019035073.
Which hospitals is Dr. Markus George Zei affiliated with?
Dr. Zei is affiliated with Missouri Baptist Medical Center. Dmand AI links Dr. Zei to 4 more hospitals.
What medical group is Dr. Markus George Zei part of?
Dr. Zei is linked to WashU Medicine Psychiatry. Dmand AI links Dr. Zei to 4 more medical groups.
Does Dr. Markus George Zei accept Medicare?
Yes. CMS data shows Dr. Zei billed Medicare for 3,199 services in 2024, and Dr. Zei accepts Medicare assignment.
How many Medicare patients does Dr. Markus George Zei see?
CMS counts 2,767 Medicare patients who saw Dr. Zei in 2024, with an average age of 75.
What services does Dr. Markus George Zei bill to Medicare?
In 2024, Dr. Zei's most billed Medicare services were diagnostic imaging (71045), diagnostic imaging (71046) and diagnostic imaging (70450).
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Where did Dr. Markus George Zei go to medical school?
Dr. Zei graduated from Saint Louis University School of Medicine in 2015.
Has Dr. Markus George Zei received payments from drug or device companies?
CMS Open Payments shows $179 in general payments to Dr. Zei from 8 companies from 2016 to 2016. The largest total came from Gilead Sciences, Inc.
How long has Dr. Markus George Zei been practicing?
Dr. Zei graduated from medical school in 2015, 11 years ago.
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