Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Dr. Marshall A Longnecker, MD

Individual provider Anesthesiology Physician · NPI 1225012743

Dr. Marshall A Longnecker, MD is an Anesthesiology in Green Bay, Wisconsin. Graduated from University of Chicago, Pritzker School of Medicine in 1987, 39 years ago. Practices with Bellin Anesthesia Associates SC, a 33-clinician group and accepts Medicare assignment. Licensed in Wisconsin.

Years since qualifying
39
Trained at
University of Chicago, Pritzker School of Medicine
Licensed in
WI
In the registry since
2005
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

744 S Webster Ave
Green Bay, WI 54301-3505
Phone: (920) 433-3500
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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 33087-020 (WI)

Record details

NPI number1225012743
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedNovember 30, 2005
Last updated in NPPESFebruary 15, 2009

Medicare enrollment

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

Medicare specialtyANESTHESIOLOGY
Medical schoolUNIVERSITY OF CHICAGO, PRITZKER SCHOOL OF MEDICINE
Graduated 1987 (39 years in practice)
Group practice Bellin Anesthesia Associates Sc — 33 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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