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

Gregory M Keelen, DO

Individual provider Emergency Medicine Physician · NPI 1811905227

Gregory M Keelen, DO practises Emergency Medicine in Denison, Texas. Graduated from University of Kansas School of Med (KC/WICH/SAL) in 2003, 23 years ago. Practices with Ies Central Texas PLLC, a 33-clinician group and accepts Medicare assignment. Licensed in Texas.

Years since qualifying
23
Trained at
University of Kansas School of Med (KC/WICH/SAL)
Licensed in
TX
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

5016 US-75 Tmc Emergency Dept
Denison, TX 75020
Phone: (214) 433-9602
Fax: (214) 433-9602
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence M1822 (TX)

Record details

NPI number1811905227
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedAugust 3, 2006
Last updated in NPPESJanuary 22, 2024
Certification dateJanuary 19, 2024

Medicare enrollment

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

Medicare specialtyEMERGENCY MEDICINE
Medical schoolUNIVERSITY OF KANSAS SCHOOL OF MED (KC/WICH/SAL)
Graduated 2003 (23 years in practice)
Group practice Ies Central Texas Pllc — 33 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 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 patients651
Services billed 749 a service is one billed item, such as a visit, a test or a procedure
Average patient age75

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 Ies Central Texas PLLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 33 clinicians in the practice; 12 are shown here.

Other providers in Denison