Gregory Mumm, M.D.
NPI 1548228810 · Rheumatology Physician · Sioux Falls, SD
Enrolled with Medicare as Practitioner - Rheumatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Mumm, M.D. is a Rheumatology Physician provider in Sioux Falls, SD (NPI 1548228810).
Provider details
- NPI number
- 1548228810
- Entity type
- Individual
- Primary specialty
- Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 48817 (WI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
1,382 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 551 | $92 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 474 | $16 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 104 | $64 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 63 | $125 |
| Aspiration And/Or Injection of Fluid From Large Joint20610 | 60 | $45 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 45 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Methotrexate Sodiumbrand: Methotrexate | 909 | 198 |
| Hydroxychloroquine Sulfate | 563 | 123 |
| Prednisone | 294 | 139 |
| Leflunomide | 259 | 52 |
| Allopurinol | 219 | 51 |
| Duloxetine Hcl | 144 | 40 |
| Adalimumabbrand: Humira(cf) Pen | 118 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$133 across 6 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (1)
- 1301 S. Cliff AveSte 300Sioux Falls, SD 57105-1032Phone: (605) 322-6625Fax: (605) 322-6626
Registry dates
- Enumerated
- 2006-05-03
- Last updated
- 2019-10-31
Frequently asked questions
- What is Gregory Mumm's NPI number?
- Gregory Mumm's National Provider Identifier (NPI) is 1548228810, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Mumm's specialty?
- Gregory Mumm is listed in the NPPES registry with a primary specialty of Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is Gregory Mumm located?
- Gregory Mumm's practice location on file with NPPES is 6100 S Louise Ave Ste 1130, Sioux Falls, SD 57108-6021.
- What is Gregory Mumm's phone number?
- The practice phone number listed in the NPPES registry for Gregory Mumm is (605) 504-1600.
- Does Gregory Mumm accept Medicare?
- Gregory Mumm is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Mumm's NPI active?
- Yes — Gregory Mumm's NPI (1548228810) is active in the NPPES registry as of the last update on 2019-10-31.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.