Natalie Sivak, M.D.
NPI 1891943023 · Diagnostic Radiology Physician · Denver, CO
Enrolled with Medicare as Practitioner - Diagnostic Radiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Natalie Sivak, M.D. is a Diagnostic Radiology Physician provider in Denver, CO (NPI 1891943023).
Provider details
- NPI number
- 1891943023
- Entity type
- Individual
- Primary specialty
- Diagnostic Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- 2008-01479 (NC)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
18 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
1,598 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) |
|---|---|---|
| Ct Scan of Abdomen and Pelvis With Contrast74177 | 323 | $84 |
| X-Ray of Abdomen, 1 View74018 | 231 | $9 |
| Ct Scan of Chest With Contrast71260 | 135 | $52 |
| Ultrasound Study of One Arm Or Leg Veins With Compression and Maneuvers93971 | 96 | $20 |
| Ct Scan of Abdomen and Pelvis Without Contrast74176 | 74 | $81 |
| Complete Ultrasound Scan Behind Abdominal Cavity76770 | 68 | $34 |
Practice location
Mailing address
Additional practice locations (1)
- 12605 E 16th AveAurora, CO 80045-2545Phone: (720) 848-0000
Registry dates
- Enumerated
- 2008-08-29
- Last updated
- 2026-03-16
- Certified
- 2026-03-16
Frequently asked questions
- What is Natalie Sivak's NPI number?
- Natalie Sivak's National Provider Identifier (NPI) is 1891943023, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Natalie Sivak's specialty?
- Natalie Sivak is listed in the NPPES registry with a primary specialty of Diagnostic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is Natalie Sivak located?
- Natalie Sivak's practice location on file with NPPES is 2045 N Franklin St, Denver, CO 80205-5437.
- What is Natalie Sivak's phone number?
- The practice phone number listed in the NPPES registry for Natalie Sivak is (303) 338-4545.
- Does Natalie Sivak accept Medicare?
- Natalie Sivak is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Natalie Sivak's NPI active?
- Yes — Natalie Sivak's NPI (1891943023) is active in the NPPES registry as of the last update on 2026-03-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.