Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Mark Timothy Monahan, MD

Individual provider Emergency Medicine Physician · NPI 1518998327

Mark Timothy Monahan, MD practises Emergency Medicine in Dixon, Illinois. Graduated from University of Chicago, Pritzker School of Medicine in 2000, 26 years ago. Practices with Osf Multi-Specialty Group, a 2,128-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Illinois and Indiana.

Years since qualifying
26
Trained at
University of Chicago, Pritzker School of Medicine
Licensed in
IL, IN
In the registry since
2006
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

403 E 1st St
Dixon, IL 61021-3116
Phone: (815) 288-5531
Fax: (815) 285-5558
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 615 N Michigan St, South Bend, IN 46601-1033 — (574) 647-7459

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence 036107925 (IL)
Emergency Medicine Physician Taxonomy 207P00000X · Licence 01057437A (IN)

Record details

NPI number1518998327
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 6, 2006
Last updated in NPPESAugust 5, 2025
Certification dateAugust 5, 2025

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyEMERGENCY MEDICINE
Medical schoolUNIVERSITY OF CHICAGO, PRITZKER SCHOOL OF MEDICINE
Graduated 2000 (26 years in practice)
Group practice Osf Multi-Specialty Group — 2128 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients438
Services billed 566 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

Colleagues at Osf Multi-Specialty Group

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 2128 clinicians in the practice; 12 are shown here.

Other providers in Dixon