Doctor profile · Federal record

Dr. Mark Monahan, M.D.

Emergency Medicine Physician (CMS: Emergency Medicine) · Emergency Medicine Physician · Dixon, IL

  • NPI 1518998327
  • Accepts Medicare
  • 26 yrs in practice
  • Licensed in 2 states
  • Male
  • Group practice
  • No sanctions

Practice & contact

Operates at 2 locations .

NPPES Updated May 11, 2026
Primary practice
403 E 1St St
Dixon, IL 610213116
(815) 288-5531
fax (815) 285-5558
Additional location
615 N Michigan St
South Bend, IN 466011033
(574) 647-7459
fax (574) 284-3342

Credentials & registration

NPPES · NUCC
NPI registered
July 2006 — 20 yrs on file
Profile last updated
August 5, 2025
Year of graduation
2000 — 26 yrs since
Specialty taxonomy
207P00000X — NUCC code
State licenses (2)
Illinois #036107925 · Indiana #01057437A
Medicaid (2)
MI #4782693 · IN #200432460

Federal sanctions & exclusions

OIG LEIE Updated May 11, 2026

No sanctions, exclusions or revocations on file

Checked against OIG LEIE on NPI 1518998327. Last verified May 11, 2026.

Medicare procedures · 2023

Top services delivered

CMS Provider Utilization
Total services
514
Distinct HCPCS
5
Medicare allowed
$62,467
HCPCS Description Services Patients Avg allowed
99284 Emergency department visit with moderate level of medical decision making 192 186 $117
99285 Emergency department visit with high level of medical decision making 141 138 $169
99283 Emergency department visit with low level of medical decision making 93 92 $71
99291 Critical care, first 30-74 minutes 45 43 $205
93010 Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only 43 42 $8

In context: peer comparison

Among 3 peers in this city , average services per provider: 77. This provider delivers 6.7× the peer median.

Medicare Part D · 2023

Top prescriptions

CMS Part D Prescriber
Total claims
228
Patients
225
Total drug cost
$1,071
Drug Type Claims Patients Total cost
Naproxen Generic 56 56 $124
Prednisone Generic 38 37 $119
Ondansetron Odt (Ondansetron) Brand 33 33 $168
Hydrocodone-Acetaminophen (Hydrocodone/Acetaminophen) Brand 27 26 $114
Cephalexin Generic 26 25 $286
Cyclobenzaprine Hcl Generic 19 19 $54
Azithromycin Generic 17 17 $140
Levofloxacin Generic 12 12 $65

Hospital affiliations

CMS Hospital Compare

Frequently asked questions

Auto-generated from federal data
What is Dr. Mark Monahan's medical specialty?
Dr. Mark Monahan practices Emergency Medicine Physician in Dixon, IL.
Where does Dr. Mark Monahan practice?
Dr. Mark Monahan practices at 403 E 1St St, Dixon, IL 610213116. Office phone: 8152885531.
What is Dr. Mark Monahan's NPI?
Dr. Mark Monahan's National Provider Identifier (NPI) is 1518998327, issued by NPPES.
Does Dr. Mark Monahan accept Medicare assignment?
Yes. Dr. Mark Monahan accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Mark Monahan commonly perform?
Top Medicare-reported procedures in 2023: Emergency department visit with moderate level of medical decision making (HCPCS 99284); Emergency department visit with high level of medical decision making (HCPCS 99285); Emergency department visit with low level of medical decision making (HCPCS 99283). Source: CMS Medicare Physician & Other Practitioners file.