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

Mr. Daniel O'Brien, MD

Individual provider Transplant Surgery Physician · NPI 1548659980

Mr. Daniel O'Brien, MD practises General Surgery in Milwaukee, Wisconsin. Graduated from Northwestern University Feinberg Medical School in 2016, 10 years ago. Practices with Advocate Health and Hospitals Corporation, a 3,079-clinician group, works from 4 locations and accepts Medicare assignment. Licensed in California, Illinois, Indiana and Wisconsin.

Years since qualifying
10
Trained at
Northwestern University Feinberg Medical School
Licensed in
CA, IL, IN, WI
In the registry since
2015
Specialties on file
5
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

2900 W Oklahoma Ave
Milwaukee, WI 53215-4330
Phone: (414) 649-6000
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (3)

  • 200 Ucla Medical Plz Ste 214, Los Angeles, CA 90095-5611 — (310) 825-8138
  • 1800 W Superior St, Chicago, IL 60622-5611 — (847) 903-1336
  • 4400 W 95th St Ste 112, Oak Lawn, IL 60453-2657 — (708) 684-7100

Specialties & licences

Transplant Surgery Physician (primary) Taxonomy 204F00000X · Licence 82286 (WI)
Transplant Surgery Physician Taxonomy 204F00000X · Licence A173264 (CA)
Surgery Physician Taxonomy 208600000X · Licence A173264 (CA)
Surgery Physician Taxonomy 208600000X · Licence 036-165946 (IL)
Student in an Organized Health Care Education/Training Program Taxonomy 390200000X · Licence 11018992A (IN)

Record details

NPI number1548659980
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJanuary 22, 2015
Last updated in NPPESOctober 19, 2023
Certification dateOctober 19, 2023

Medicare enrollment

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

Medicare specialtyGENERAL SURGERY
Medical schoolNORTHWESTERN UNIVERSITY FEINBERG MEDICAL SCHOOL
Graduated 2016 (10 years in practice)
Group practice Advocate Health And Hospitals Corporation — 3079 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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 patients99
Services billed 425 a service is one billed item, such as a visit, a test or a procedure
Average patient age60

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.

Colleagues at Advocate Health and Hospitals Corporation

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 3079 clinicians in the practice; 12 are shown here.

Other providers in Milwaukee