Quick answers
- Which hospitals does Gregory E. Mumm work at?
- Medicare's official clinician data lists Gregory E. Mumm at 5 hospitals: Avera Holy Family Hospital, Avera Marshall Regional Medical Ctr, Avera McKennan Hospital & University Health Center, Avera St Mary's Hospital and Milbank Area Hospital/Avera Health. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Gregory E. Mumm see patients?
- Medicare's clinician data lists 5 practice locations, including Sioux Falls, SD. Call before your visit to confirm the address.
- What is Gregory E. Mumm's specialty?
- Medicare lists Rheumatology as the primary specialty, and also Internal Medicine.
- Does Gregory E. Mumm accept Medicare assignment?
- Yes. Medicare's clinician data says Gregory E. Mumm accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- Does Gregory E. Mumm offer telehealth?
- Medicare's clinician data says Gregory E. Mumm offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Gregory E. Mumm?
- (605) 322-4878, as listed in official Medicare / NPI Registry data.
- What is Gregory E. Mumm's NPI number?
- 1548228810. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Gregory E. Mumm works
Medicare's Facility Affiliation Data lists Gregory E. Mumm at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Avera Holy Family HospitalEstherville, IA · Critical Access Hospital · CCN 161351
- Avera Marshall Regional Medical CtrMarshall, MN · Critical Access Hospital · CCN 241359
- Avera McKennan Hospital & University Health CenterSioux Falls, SD · Acute Care Hospital · CCN 430016
- Avera St Mary's HospitalPierre, SD · Acute Care Hospital · CCN 430015
- Milbank Area Hospital/Avera HealthMilbank, SD · Critical Access Hospital · CCN 431326
Practice locations
Addresses where Gregory E. Mumm is enrolled with Medicare (CMS data updated 2026-10-02).
- 1325 S Cliff AveSioux Falls, SD 57105
- 1325 S Cliff Ave, RadiologySioux Falls, SD 57105 (605) 322‑4878
- 6100 S Louise AveSioux Falls, SD 57108
- 6100 S Louise Ave, Suite 1110Sioux Falls, SD 57108 (605) 322‑6700
- 6100 S Louise Ave, Suite 1130Sioux Falls, SD 57108 (605) 504‑1600
Group practices
Medicare enrollment lists Gregory E. Mumm as a member of this group (CMS data updated 2026-10-02).
- Avera McKennan959 clinicians in the group
Specialties
- Rheumatologyprimary
- Internal Medicinealso
Other rheumatologists in Sioux Falls
Clinicians with the same Medicare primary specialty in Sioux Falls, SD — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of North Dakota School Of Medicine |
| Graduation year | 2004 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1548228810 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians