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

Individual provider Internal Medicine Physician · NPI 1578556171

Dr. Cathy Nieman, MD is an Internal Medicine in Stillwater, Oklahoma. Graduated from University of Oklahoma College of Medicine in 1996, 30 years ago. Practices with Stillwater Medical Center Authority, a 168-clinician group and accepts Medicare assignment. Licensed in Oklahoma.

Years since qualifying
30
Trained at
University of Oklahoma College of Medicine
Licensed in
OK
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

821 S Walnut St
Stillwater, OK 74074-4226
Phone: (405) 372-4646
Fax: (405) 372-4685
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 20253 (OK)

Record details

NPI number1578556171
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedAugust 30, 2005
Last updated in NPPESJuly 8, 2007
Mailing address821 S Walnut St, Stillwater, OK 74074-4226

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolUNIVERSITY OF OKLAHOMA COLLEGE OF MEDICINE
Graduated 1996 (30 years in practice)
Group practice Stillwater Medical Center Authority — 168 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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