Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Dr. John Gabriel Hagen, MD

Individual provider Anesthesiology Physician · NPI 1649430026

Dr. John Gabriel Hagen, MD practises Anesthesiology in Ann Arbor, Michigan. Graduated from State University of New York Downstate Medical Center in 2007, 19 years ago. Practices with Memorial Anesthesiology Group, a 301-clinician group and accepts Medicare assignment. Licensed in Michigan and New York.

Years since qualifying
19
Trained at
State University of New York Downstate Medical Center
Licensed in
MI, NY
In the registry since
2008
Specialties on file
3
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

712 W Huron St Apt 107
Ann Arbor, MI 48103-4261
Phone: (917) 434-3548
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Anesthesiology Physician (primary) Taxonomy 207L00000X · Licence P73032 (NY)
Anesthesiology Physician Taxonomy 207L00000X · Licence 4301098090 (MI)
Student in an Organized Health Care Education/Training Program Taxonomy 390200000X

Record details

NPI number1649430026
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 10, 2008
Last updated in NPPESOctober 30, 2019

Medicare enrollment

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

Medicare specialtyANESTHESIOLOGY
Medical schoolSTATE UNIVERSITY OF NEW YORK DOWNSTATE MEDICAL CENTER
Graduated 2007 (19 years in practice)
Group practice Memorial Anesthesiology Group — 301 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 patients270
Services billed 287 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.

Affiliated with 1 hospital, which CMS identifies by certification number only.

Colleagues at Memorial Anesthesiology Group

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 301 clinicians in the practice; 12 are shown here.

Other providers in Ann Arbor