Christopher Gregory, MD
NPI 1821050212 · Diagnostic Radiology Physician · Sioux Falls, SD
Enrolled with Medicare as Practitioner - Diagnostic Radiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Christopher Gregory, MD is a Diagnostic Radiology Physician provider in Sioux Falls, SD (NPI 1821050212).
Provider details
- NPI number
- 1821050212
- Entity type
- Individual
- Primary specialty
- Diagnostic Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 5278 (SD)
Specialties & taxonomies
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
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
2,972 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) |
|---|---|---|
| X-Ray of Chest, 1 View71045 | 518 | $8 |
| Nuclear Medicine Study From Skull Base to Mid-Thigh With Ct Scan78815 | 312 | $106 |
| X-Ray of Chest, 2 Views71046 | 149 | $10 |
| Ct Scan Head Or Brain Without Contrast70450 | 135 | $37 |
| Ct Scan of Abdomen and Pelvis With Contrast74177 | 134 | $81 |
| Nuclear Medicine Studies of Heart Muscle at Rest and With Stress and Spect78452 | 129 | $71 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$30 across 1 record (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
Registry dates
- Enumerated
- 2006-04-03
- Last updated
- 2018-10-17
Frequently asked questions
- What is Christopher Gregory's NPI number?
- Christopher Gregory's National Provider Identifier (NPI) is 1821050212, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Christopher Gregory's specialty?
- Christopher Gregory is listed in the NPPES registry with a primary specialty of Diagnostic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is Christopher Gregory located?
- Christopher Gregory's practice location on file with NPPES is 1325 S. Cliff Ave, Sioux Falls, SD 57105-3762.
- What is Christopher Gregory's phone number?
- The practice phone number listed in the NPPES registry for Christopher Gregory is (605) 322-7510.
- Does Christopher Gregory accept Medicare?
- Christopher Gregory is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Christopher Gregory's NPI active?
- Yes — Christopher Gregory's NPI (1821050212) is active in the NPPES registry as of the last update on 2018-10-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.