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

Individual provider Family Medicine Physician · NPI 1124133640

Dr. Michael Joseph Greiner, MD is a Family Practice in Fairfield, Iowa. Graduated from University of Iowa, Rj & L Carver College of Medicine in 1987, 39 years ago. Practices with Jefferson County Hospital, a 47-clinician group and accepts Medicare assignment. Licensed in Iowa.

Years since qualifying
39
Trained at
University of Iowa, Rj & L Carver College of Medicine
Licensed in
IA
In the registry since
2006
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

2000B S Main St
Fairfield, IA 52556-3740
Phone: (641) 472-4156
Fax: (641) 472-9436
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence 26708 (IA)

Record details

NPI number1124133640
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedAugust 21, 2006
Last updated in NPPESJune 19, 2009
Mailing address2000b South Main St, P.O. Box 1507, Fairfield, IA 52556-3740

Medicare enrollment

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

Medicare specialtyFAMILY PRACTICE
Medical schoolUNIVERSITY OF IOWA, RJ & L CARVER COLLEGE OF MEDICINE
Graduated 1987 (39 years in practice)
Group practice Jefferson County Hospital — 47 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 on file with Medicare

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