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

William Brock Kretsinger, DO

Individual provider Internal Medicine Physician · NPI 1346270915

William Brock Kretsinger, DO practises Internal Medicine in Emporia, Kansas. Graduated from University of Missouri, Kansas City, School of Medicine in 1990, 36 years ago. Practices with Cotton-O'Neil Clinic Revocable Trust, a 658-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Kansas.

Years since qualifying
36
Trained at
University of Missouri, Kansas City, School of Medicine
Licensed in
KS
In the registry since
2006
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

1301 W 12th Ave
Emporia, KS 66801-2587
Phone: (620) 342-2900
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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 05-19185 (KS)

Record details

NPI number1346270915
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedJuly 3, 2006
Last updated in NPPESJanuary 19, 2026
Certification dateJanuary 19, 2026

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolUNIVERSITY OF MISSOURI, KANSAS CITY, SCHOOL OF MEDICINE
Graduated 1990 (36 years in practice)
Group practice Cotton-O'Neil Clinic Revocable Trust — 658 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

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 patients475
Services billed 5,652 a service is one billed item, such as a visit, a test or a procedure
Average patient age77

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. Those with a page here are linked.

Colleagues at Cotton-O'Neil Clinic Revocable Trust

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 658 clinicians in the practice; 12 are shown here.

Other providers in Emporia