Dr. Mark Christopher Gillis, MD
- Medicare services, 2024
- 4,333
- Medicare patients, 2024
- 496
- Part D claims, 2024
- 7,986
- Industry payments
- $22
- Affiliated sites
- 2
- Practice address
- 1300 N Arlington Heights Rd Ste 130 Suite 130, Itasca, IL 60143
- Practice phone
- Call (847) 871-4540
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Dupage Medical Group - Primary Care - Itasca (N Arlington Heights Rd)
Multi-specialty group site · Itasca, Illinois
Find Dr. Gillis' 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. Mark Christopher Gillis is a family medicine physician in Itasca, Illinois
Dr. Gillis practices at Dupage Medical Group - Primary Care - Itasca (N Arlington Heights Rd) in Itasca, Illinois.
Dr. Gillis' NPI, 1992806509, was assigned on September 26, 2006. Dr. Gillis graduated from Loyola University of Chicago, Stritch School of Medicine in 1986. Dr. Gillis holds Illinois license 036078671.
- NPI
- 1992806509NPI Registry (opens in a new tab)
- NPI enumeration date
- September 26, 2006
- NPI status
- Active
- Practice phone
- (847) 871-4540
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 66
- Medical school graduation
- 1986
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Mark Christopher Gillis practices at Dupage Medical Group - Primary Care - Itasca (N Arlington Heights Rd) in Itasca, Illinois
Dr. Gillis' primary practice is Dupage Medical Group - Primary Care - Itasca (N Arlington Heights Rd), at 1300 N Arlington Heights Rd Ste 130 Suite 130, Itasca, IL 60143. The practice phone is (847) 871-4540.
- Dupage Medical Group - Primary Care - Itasca (N Arlington Heights Rd)1300 N Arlington Heights Rd Ste 130 Suite 130, Itasca, IL 60143Phone(847) 871-4540
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Mark Christopher Gillis is affiliated with 2 sites of care and 2 medical groups
Dr. Gillis' primary practice is Dupage Medical Group - Primary Care - Itasca (N Arlington Heights Rd) in Itasca, Illinois. The medical group on file is DuPage Medical Group. Dmand AI also links Dr. Gillis to 1 more therapy and rehab clinic and 1 medical group, each named with a free account. Dr. Gillis' employer is on file too: a physical therapy & rehab clinic.
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dmand AI tracks the EHR system at Dr. Mark Christopher Gillis' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Gillis practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Dupage Medical Group - Primary Care - Itasca (N Arlington Heights Rd) | Available with a free account |
| +1 more site 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. Mark Christopher Gillis is one of 5,105 family medicine physicians in Illinois
Family medicine is Dr. Gillis' primary specialty in the NPI Registry, under taxonomy code 207Q00000X. Dr. Gillis is licensed in Illinois.
Specialties and state licenses
- Family medicine, IllinoisPrimary
Family medicine physicians near Dr. Gillis
Counts of family medicine physicians 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. Mark Christopher Gillis billed Medicare for 4,333 services in 2024
CMS data shows 4,333 Medicare services from Dr. Gillis across 39 procedure codes in 2024, for 496 Medicare patients. Medicare paid $131,209 for them. Every service was in an office.
Dr. Gillis' Medicare services by type, 2024
- Lab and pathology2,512
- Surgery667
- Office and hospital visits641
- Other services410
- Tests and treatments103
Dr. Gillis compared with the Illinois median for family medicine physicians, 2024
- Dr. Gillis
- Illinois median
- Medicare services
- 4,333vs 35612.2 times
- Medicare patients
- 496vs 1603.1 times
- Part D claims
- 7,288vs 61811.8 times
Medians across 5,015 family medicine physicians in Illinois with Dmand AI profiles that report each measure.
Dr. Gillis' 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. Gillis?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Gillis and other family medicine physicians in Illinois.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Mark Christopher Gillis treated 496 Medicare patients in 2024, average age 75
CMS counts 496 Medicare patients who saw Dr. Gillis in 2024. The largest group is 65 to 74, with 260 patients. 75% of them have high cholesterol, and 71% have high blood pressure. 4% are also on Medicaid. Their average risk score is 0.98, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Gillis' median patient age at 65, with 47% women.
Dr. Gillis' Medicare patients by age, 2024
Dr. Gillis' Medicare patients by sex, 2024
- Women23447%
- Men26253%
Chronic conditions among Dr. Gillis' Medicare patients, 2024
- High cholesterol75%
- High blood pressure71%
- Arthritis43%
- Ischemic heart disease30%
- Chronic kidney disease26%
- Diabetes26%
- Anxiety19%
- Cancer19%
Share of Medicare patients with each condition. A patient can have several.
Dr. Gillis' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 65
Patient panel by sex, all payers
- Women47%
- Men53%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Mark Christopher Gillis wrote 7,986 Medicare Part D claims in 2024
In 2024, Dr. Gillis wrote 7,986 Medicare Part D claims for 696 patients. 93% of them were for generic drugs. CMS names the drug for 7,288 of them, across 106 drugs with 11 or more claims each, at $164,488 in total drug cost.
Dr. Gillis' Part D claims by kind of drug, 2024
- Generic7,451 claims93%
- Brand-name508 claims6%
- Other27 claims0%
Dr. Gillis' 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. Gillis' Part D claims, 2024
- Opioids3%208 of 7,986 claims
- Antibiotics2%135 of 7,986 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
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
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. Mark Christopher Gillis received $22 in industry payments in 2024
CMS Open Payments shows 1 general payment to Dr. Gillis from 1 drug or device company in 2024. Food and beverage make up the largest share, 100% of the total. Exact Sciences Corporation paid the most, $22.
Companies that paid Dr. Gillis the most, 2024 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Mark Christopher Gillis graduated from Loyola University of Chicago, Stritch School of Medicine
Dr. Gillis graduated from Loyola University of Chicago, Stritch School of Medicine in 1986.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Mark Christopher Gillis'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 DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| 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) |
| 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. Mark Christopher Gillis
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. Mark Christopher Gillis' NPI number?
Dr. Mark Christopher Gillis' NPI number is 1992806509. It was assigned on September 26, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Mark Christopher Gillis?
Dr. Mark Christopher Gillis is a family medicine physician in Itasca, Illinois. The primary specialty in the NPI Registry is Family Medicine Physician (taxonomy code 207Q00000X).
Where does Dr. Mark Christopher Gillis practice?
Dr. Gillis practices at 1300 N Arlington Heights Rd Ste 130 Suite 130, Itasca, IL 60143. Dr. Gillis' primary practice is Dupage Medical Group - Primary Care - Itasca (N Arlington Heights Rd) in Itasca, Illinois. Dmand AI also links Dr. Gillis to 1 therapy and rehab clinic and 1 medical group.
What is Dr. Mark Christopher Gillis' office phone number?
The practice phone on file for Dr. Gillis is (847) 871-4540.
What is Dr. Mark Christopher Gillis' medical license number?
Dr. Gillis holds Illinois license 036078671.
What medical group is Dr. Mark Christopher Gillis part of?
Dr. Gillis is linked to DuPage Medical Group. Dmand AI links Dr. Gillis to 1 more medical group.
Does Dr. Mark Christopher Gillis accept Medicare?
Yes. CMS data shows Dr. Gillis billed Medicare for 4,333 services in 2024.
How many Medicare patients does Dr. Mark Christopher Gillis see?
CMS counts 496 Medicare patients who saw Dr. Gillis in 2024, with an average age of 75.
What services does Dr. Mark Christopher Gillis bill to Medicare?
In 2024, Dr. Gillis' most billed Medicare services were surgery: heart and blood vessels (36415), lab and pathology test (80053) and lab and pathology test (80061).
Where did Dr. Mark Christopher Gillis go to medical school?
Dr. Gillis graduated from Loyola University of Chicago, Stritch School of Medicine in 1986.
Show 3 more questionsShow fewer questions
What drugs does Dr. Mark Christopher Gillis prescribe most?
In 2024 Medicare Part D data, Dr. Gillis' most prescribed drugs by claims were Atorvastatin Calcium, Levothyroxine Sodium and Amlodipine Besylate.
Has Dr. Mark Christopher Gillis received payments from drug or device companies?
CMS Open Payments shows $22 in general payments to Dr. Gillis from 1 company from 2024 to 2024. The largest total came from Exact Sciences Corporation.
How long has Dr. Mark Christopher Gillis been practicing?
Dr. Gillis graduated from medical school in 1986, 40 years ago.
Selling to family medicine practices?
See family medicine physicians in Illinois 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