Dr. Mark L. Day, MD
- Medicare services, 2024
- 32
- Medicare patients, 2024
- 46
- Part D claims, 2024
- 68
- Industry payments
- $19
- State license
- 1
- Practice address
- 611 W Park St, Urbana, IL 61801
- Practice phone
- Call (217) 326-2955
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Carle Foundation Hospital
Urbana, Illinois
Find Dr. Day's 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 L. Day is an internist in Urbana, Illinois
Dr. Day practices at Carle Foundation Hospital in Urbana, Illinois.
Dr. Day's NPI, 1174679237, was assigned on January 25, 2007. Dr. Day holds Illinois license 036.117437.
- NPI
- 1174679237NPI Registry (opens in a new tab)
- NPI enumeration date
- January 25, 2007
- NPI status
- Active
- Practice phone
- (217) 326-2955
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Practice Data
Dr. Mark L. Day practices at Carle Foundation Hospital in Urbana, Illinois
Dr. Day's primary practice is Carle Foundation Hospital, at 611 W Park St, Urbana, IL 61801 in Champaign County. The practice phone is (217) 326-2955.
- Carle Foundation Hospital611 W Park St, Urbana, IL 61801 · Champaign CountyPhone(217) 326-2955
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Mark L. Day is affiliated with 1 site of care
Dr. Day's primary practice is Carle Foundation Hospital in Urbana, Illinois.
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dmand AI tracks the EHR system at Dr. Mark L. Day's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Day practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Carle Foundation Hospital | 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 L. Day is one of 5,652 internists in Illinois
Internal medicine is Dr. Day's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Day is licensed in Illinois.
Specialties and state licenses
- Internal medicine, IllinoisPrimary
Internists near Dr. Day
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 L. Day billed Medicare for 32 services in 2024
CMS data shows 32 Medicare services from Dr. Day across 2 procedure codes in 2024, for 46 Medicare patients. Medicare paid $2,442 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Day's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1302024: 3275%
- Tests and treatments
- 2023: 122024: 0100%
Dr. Day compared with the Illinois median for internists, 2024
- Dr. Day
- Illinois median
- Medicare services
- 32vs 56694% below
- Medicare patients
- 46vs 20878% below
- Part D claims
- 27vs 28490% below
Medians across 5,192 internists in Illinois with Dmand AI profiles that report each measure.
Dr. Day'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.
Need commercial claims for Dr. Day?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Day and other internists in Illinois.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Mark L. Day treated 46 Medicare patients in 2024, average age 81
CMS counts 46 Medicare patients who saw Dr. Day in 2024. The largest group is 85 and over, with 19 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 24% are also on Medicaid. Their average risk score is 2.33, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Dr. Day's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Day's Medicare patients by sex, 2024
- Women2657%
- Men2043%
Chronic conditions among Dr. Day's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Ischemic heart disease61%
- Arthritis57%
- Chronic kidney disease54%
- Heart failure52%
- Atrial fibrillation50%
- COPD41%
Share of Medicare patients with each condition. A patient can have several.
Source: Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Mark L. Day wrote 68 Medicare Part D claims in 2024
In 2024, Dr. Day wrote 68 Medicare Part D claims for 22 patients. 100% of them were for generic drugs. CMS names the drug for 27 of them, across 2 drugs with 11 or more claims each, at $15 in total drug cost. In 2023, CMS named 39 claims across 3 drugs.
Dr. Day'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.
Drug classes CMS tracks in Dr. Day's Part D claims, 2024
- Antibiotics40%27 of 68 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: 392024: 2731%
Drugs named by CMS: 2 in 2024, 3 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
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 L. Day received $19 in industry payments in 2018
CMS Open Payments shows 1 general payment to Dr. Day from 1 drug or device company in 2018. Food and beverage make up the largest share, 100% of the total. GlaxoSmithKline, LLC. paid the most, $19.
Companies that paid Dr. Day the most, 2018 to 2018
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Mark L. Day'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 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 | Medicare 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) |
| 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 L. Day
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 L. Day's NPI number?
Dr. Mark L. Day's NPI number is 1174679237. It was assigned on January 25, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. Mark L. Day?
Dr. Mark L. Day is an internist in Urbana, Illinois. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Mark L. Day practice?
Dr. Day practices at 611 W Park St, Urbana, IL 61801. Dr. Day's primary practice is Carle Foundation Hospital in Urbana, Illinois.
What is Dr. Mark L. Day's office phone number?
The practice phone on file for Dr. Day is (217) 326-2955.
What is Dr. Mark L. Day's medical license number?
Dr. Day holds Illinois license 036.117437.
Does Dr. Mark L. Day accept Medicare?
Yes. CMS data shows Dr. Day billed Medicare for 32 services in 2024.
How many Medicare patients does Dr. Mark L. Day see?
CMS counts 46 Medicare patients who saw Dr. Day in 2024, with an average age of 81.
What services does Dr. Mark L. Day bill to Medicare?
In 2024, Dr. Day's most billed Medicare services were emergency department visit (99284) and emergency department visit (99285).
What drugs does Dr. Mark L. Day prescribe most?
In 2024 Medicare Part D data, Dr. Day's most prescribed drugs by claims were Azithromycin and Prednisone.
Has Dr. Mark L. Day received payments from drug or device companies?
CMS Open Payments shows $19 in general payments to Dr. Day from 1 company from 2018 to 2018. The largest total came from GlaxoSmithKline, LLC.
How long has Dr. Mark L. Day been practicing?
Dr. Day's NPI was assigned in 2007.
Selling to internal medicine practices?
See internists 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