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

Dr. Gregory Charles Hahn, DO

Individual provider Psychiatry Physician · NPI 1972702215

Dr. Gregory Charles Hahn, DO practises Psychiatry in Merriam, Kansas. Qualified in 2007, 19 years ago. Practices with Shawnee Mission Medical Center Inc, a 277-clinician group and accepts Medicare assignment. Licensed in Kansas.

Years since qualifying
19
Licensed in
KS
In the registry since
2007
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

9100 W 74th St
Merriam, KS 66204-4004
Phone: (913) 663-2642
Fax: (913) 632-2696
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Psychiatry Physician (primary) Taxonomy 2084P0800X · Licence 05-39922 (KS)

Record details

NPI number1972702215
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedJuly 17, 2007
Last updated in NPPESSeptember 5, 2025
Certification dateSeptember 5, 2025

Medicare enrollment

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

Medicare specialtyPSYCHIATRY
Medical schoolOTHER
Graduated 2007 (19 years in practice)
Group practice Shawnee Mission Medical Center Inc — 277 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 patients199
Services billed 893 a service is one billed item, such as a visit, a test or a procedure
Average patient age62

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.

  • Adventhealth Shawnee Mission Hospital · Shawnee Mission, KS
  • Stormont Vail Hospital Hospital · Topeka, KS

Colleagues at Shawnee Mission Medical Center Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 277 clinicians in the practice; 12 are shown here.

Other providers in Merriam