Marah Van Diest, MD
NPI 1952930273 · Family Medicine Physician · Sioux Falls, SD
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marah Van Diest, MD is a Family Medicine Physician provider in Sioux Falls, SD (NPI 1952930273).
Provider details
- NPI number
- 1952930273
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 14570 (SD)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
6 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
114 Medicare services, 2024 (ranked within specialty)
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 methodology.
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 | 54 | $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 | 44 | $16 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 16 | $62 |
Typical Medicare-allowed amounts for these services range $16–$92 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 15 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Levothyroxine Sodium | 31 |
| Olmesartan Medoxomil | 29 |
| Amlodipine Besylate | 23 |
| Atorvastatin Calcium | 21 |
| Omeprazole | 19 |
| Fluoxetine Hcl | 17 |
| Allopurinol | 16 |
| Semaglutidebrand: Ozempic | 16 |
| Hydrochlorothiazide | 16 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2020-04-07
- Last updated
- 2023-08-18
- Certified
- 2023-08-18
Frequently asked questions
- What is Marah Van Diest's NPI number?
- Marah Van Diest's National Provider Identifier (NPI) is 1952930273, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marah Van Diest's specialty?
- Marah Van Diest is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Marah Van Diest located?
- Marah Van Diest's practice location on file with NPPES is 1600 S Highline Ave, Sioux Falls, SD 57110-1007.
- What is Marah Van Diest's phone number?
- The practice phone number listed in the NPPES registry for Marah Van Diest is (605) 504-5600.
- Does Marah Van Diest accept Medicare?
- Marah Van Diest is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Marah Van Diest's NPI active?
- Yes — Marah Van Diest's NPI (1952930273) is active in the NPPES registry as of the last update on 2023-08-18.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.