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

Mathias M Stroemel, DO

Individual provider Nephrology Physician · NPI 1265446660

Mathias M Stroemel, DO practises Nephrology in Walla Walla, Washington. Graduated from Oklahoma State University College of Osteopathic Medicine in 1988, 38 years ago. Practices with Commonspirit Kansas Inc, a 68-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Kansas and Washington.

Years since qualifying
38
Trained at
Oklahoma State University College of Osteopathic Medicine
Licensed in
KS, WA
In the registry since
2006
Specialties on file
2
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

301 W Poplar Ste 100
Walla Walla, WA 99362
Phone: (509) 522-5824
Fax: (509) 522-5738
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 311 E Spruce St, Garden City, KS 67846-5614 — (620) 271-3190

Specialties & licences

Nephrology Physician (primary) Taxonomy 207RN0300X · Licence OP1416 (WA)
Nephrology Physician Taxonomy 207RN0300X · Licence 05-48772 (KS)

Record details

NPI number1265446660
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedJuly 28, 2006
Last updated in NPPESJanuary 9, 2024
Certification dateNovember 28, 2023

Medicare enrollment

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

Medicare specialtyNEPHROLOGY
Medical schoolOKLAHOMA STATE UNIVERSITY COLLEGE OF OSTEOPATHIC MEDICINE
Graduated 1988 (38 years in practice)
Group practice Commonspirit Kansas Inc — 68 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations5 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 patients552
Services billed 1,225 a service is one billed item, such as a visit, a test or a procedure
Average patient age74

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.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $16 1 payment · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

Colleagues at Commonspirit Kansas Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 68 clinicians in the practice; 12 are shown here.

Other providers in Walla Walla