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

Gregory Eric Mumm, MD

Individual provider Internal Medicine Physician · NPI 1548228810

Gregory Eric Mumm, MD practises Rheumatology in Sioux Falls, South Dakota. Graduated from University of North Dakota School of Medicine in 2004, 22 years ago. Practices with Avera McKennan, a 962-clinician group, works from 2 locations, accepts Medicare assignment and offers telehealth. Licensed in South Dakota and Wisconsin.

Years since qualifying
22
Trained at
University of North Dakota School of Medicine
Licensed in
SD, WI
In the registry since
2006
Specialties on file
2
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

6100 S Louise Ave Ste 1130
Sioux Falls, SD 57108-6021
Phone: (605) 504-1600
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 1301 S. Cliff Ave, Sioux Falls, SD 57105-1032 — (605) 322-6625

Specialties & licences

Rheumatology Physician (primary) Taxonomy 207RR0500X · Licence 7481 (SD)
Internal Medicine Physician Taxonomy 207R00000X · Licence 48817 (WI)

Record details

NPI number1548228810
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMay 3, 2006
Last updated in NPPESOctober 31, 2019

Medicare enrollment

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

Medicare specialtyRHEUMATOLOGY
Also practisesINTERNAL MEDICINE
Medical schoolUNIVERSITY OF NORTH DAKOTA SCHOOL OF MEDICINE
Graduated 2004 (22 years in practice)
Group practice Avera McKennan — 962 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
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 patients533
Services billed 1,409 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

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 $291 12 payments · 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.

  • Avera Holy Family Hospital Hospital · Estherville, IA · listed as Avera Holy Family
  • Avera St Mary'S Hospital Hospital · Pierre, SD · listed as Avera St Mary's
  • Avera Marshall Regional Medical Ctr Hospital · Marshall, MN
  • Avera McKennan Hospital & University Health Center Hospital · Sioux Falls, SD
  • Milbank Area Hospital/Avera Health Hospital · Milbank, SD

Colleagues at Avera McKennan

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 962 clinicians in the practice; 12 are shown here.

Other providers in Sioux Falls