Dr. Mark Allen Fernandez, MD
- Medicare services, 2021
- 453
- Part D claims, 2024
- 220
- Industry payments
- $3,086
- Affiliated sites
- 4
- Medical groups
- 3
- Practice address
- 1201 Eagle Street, Joliet, IL 60432
- Practice phone
- Call (608) 821-7200
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Joliet VA Clinic
VA Clinic / Health Facility · Joliet, Illinois
Find Dr. Fernandez's professional email, personal email and mobile number
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Dr. Mark Allen Fernandez is an internist in Hines, Illinois
Dr. Fernandez practices at Joliet VA Clinic in Joliet, Illinois.
Dr. Fernandez's NPI, 1033114939, was assigned on June 16, 2005. Dr. Fernandez graduated from University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb) in 1985. Dr. Fernandez holds Illinois license 036-089936.
- NPI
- 1033114939NPI Registry (opens in a new tab)
- NPI enumeration date
- June 16, 2005
- NPI status
- Active
- Practice phone
- (608) 821-7200
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 67
- Medical school graduation
- 1985
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Mark Allen Fernandez practices in Joliet and Hines
Dr. Fernandez's primary practice is Joliet VA Clinic, at 1201 Eagle Street, Joliet, IL 60432. The practice phone is (608) 821-7200. Dr. Fernandez also practices at Hines VAMC, 5000 S 5th Ave, Hines, IL 60141.
- Joliet VA ClinicPrimary1201 Eagle Street, Joliet, IL 60432Phone(608) 821-7200
- Hines VAMC5000 S 5th Ave, Hines, IL 60141 · Cook CountyPhone(608) 821-7200
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; and Dmand AI Practice Data
Dr. Mark Allen Fernandez is affiliated with 4 sites of care and 3 medical groups
Dr. Fernandez's primary practice is Joliet VA Clinic in Joliet, Illinois. Dmand AI also links Dr. Fernandez to 3 group practices and clinics and 3 medical groups, each named with a free account. Dr. Fernandez's employer is on file too: a government & correctional health.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Mark Allen Fernandez's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Fernandez practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Joliet VA Clinic | Available with a free account |
| +3 more sites and 3 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Mark Allen Fernandez is one of 5,652 internists in Illinois
Internal medicine is Dr. Fernandez's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Fernandez is licensed in Illinois.
Specialties and state licenses
- Internal medicine, IllinoisPrimary
Internists near Dr. Fernandez
Counts of internists 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 Allen Fernandez billed Medicare for 453 services in 2021
CMS data shows 453 Medicare services from Dr. Fernandez across 4 procedure codes in 2021. Medicare paid $3,055 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Fernandez's Medicare services by type, 2020 to 2021
- 2020
- 2021
- Tests and treatments
- 2020: 1,1062021: 45359%
- Other services
- 2020: 152021: 0100%
Dr. Fernandez compared with the Illinois median for internists, 2021
- Dr. Fernandez
- Illinois median
- Medicare services
- 453vs 56620% below
- Part D claims
- 65vs 28477% below
Medians across 5,192 internists in Illinois with Dmand AI profiles that report each measure.
Dr. Fernandez's most billed Medicare procedure codes, 2021
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. Fernandez and other internists in Illinois.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Mark Allen Fernandez's patients have a median age of 78
Across all payers, Dmand AI patient panel data puts Dr. Fernandez's median patient age at 78, with 31% women.
Dr. Fernandez's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 78
Patient panel by sex, all payers
- Women31%
- Men69%
Source: Dmand AI Patient Panel Data
Dr. Mark Allen Fernandez wrote 220 Medicare Part D claims in 2024
In 2024, Dr. Fernandez wrote 220 Medicare Part D claims for 27 patients. 93% of them were for generic drugs. CMS names the drug for 65 of them, across 4 drugs with 11 or more claims each, at $510 in total drug cost. In 2023, CMS named 335 claims across 15 drugs.
Dr. Fernandez's Part D claims by kind of drug, 2024
- Generic205 claims93%
- Brand-name15 claims7%
Dr. Fernandez's 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.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 3352024: 6581%
Drugs named by CMS: 4 in 2024, 15 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
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Dr. Mark Allen Fernandez received $3,086 in industry payments from 2016 to 2020
CMS Open Payments shows 200 general payments to Dr. Fernandez from 30 drug and device companies from 2016 to 2020. Food and beverage make up the largest share, 99% of the total. AstraZeneca Pharmaceuticals LP paid the most, $488.
General payments to Dr. Fernandez by program year, 2016 to 2020
General payments to Dr. Fernandez by kind, 2016 to 2020
- Food and beverage$3,06799%
- Education$191%
Companies that paid Dr. Fernandez the most, 2016 to 2020
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Mark Allen Fernandez graduated from University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb)
Dr. Fernandez graduated from University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb) in 1985.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Mark Allen Fernandez'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 Affiliation DataDmand AI Practice Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy 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 Data |
| 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 Allen Fernandez
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 Allen Fernandez's NPI number?
Dr. Mark Allen Fernandez's NPI number is 1033114939. It was assigned on June 16, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Mark Allen Fernandez?
Dr. Mark Allen Fernandez is an internist in Hines, Illinois. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Mark Allen Fernandez practice?
Dr. Fernandez practices at 1201 Eagle Street, Joliet, IL 60432. Dr. Fernandez also practices at 5000 S 5th Ave, Hines, IL 60141. Dr. Fernandez's primary practice is Joliet VA Clinic in Joliet, Illinois. Dmand AI also links Dr. Fernandez to 3 group practices and clinics and 3 medical groups.
What is Dr. Mark Allen Fernandez's office phone number?
The practice phone on file for Dr. Fernandez is (608) 821-7200.
What is Dr. Mark Allen Fernandez's medical license number?
Dr. Fernandez holds Illinois license 036-089936.
Does Dr. Mark Allen Fernandez accept Medicare?
Yes. CMS data shows Dr. Fernandez billed Medicare for 453 services in 2021.
What services does Dr. Mark Allen Fernandez bill to Medicare?
In 2021, Dr. Fernandez's most billed Medicare services were heart test or procedure (93010), heart test or procedure (93227) and heart test or procedure (93790).
Where did Dr. Mark Allen Fernandez go to medical school?
Dr. Fernandez graduated from University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb) in 1985.
What drugs does Dr. Mark Allen Fernandez prescribe most?
In 2024 Medicare Part D data, Dr. Fernandez's most prescribed drugs by claims were Sulfasalazine, Lisinopril and Atorvastatin Calcium.
Has Dr. Mark Allen Fernandez received payments from drug or device companies?
CMS Open Payments shows $3,086 in general payments to Dr. Fernandez from 30 companies from 2016 to 2020. The largest total came from AstraZeneca Pharmaceuticals LP.
How long has Dr. Mark Allen Fernandez been practicing?
Dr. Fernandez graduated from medical school in 1985, 41 years ago.
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