Mark Saker, MD
NPI 1881783140 · Diagnostic Radiology Physician · Chicago, IL
Enrolled with Medicare as Practitioner - Diagnostic Radiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Saker, MD is a Diagnostic Radiology Physician provider in Chicago, IL (NPI 1881783140).
Provider details
- NPI number
- 1881783140
- Entity type
- Individual
- Primary specialty
- Diagnostic Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 036090802 (IL)
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
19 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
4,720 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) |
|---|---|---|
| X-Ray of Chest, 1 View71045 | 1,503 | $9 |
| Ct Scan Head Or Brain Without Contrast70450 | 513 | $39 |
| X-Ray of Chest, 2 Views71046 | 294 | $11 |
| Ct Scan of Upper Spine Without Contrast72125 | 238 | $47 |
| X-Ray of Chest, 2 Views71046 | 185 | $11 |
| Ct Scan of Abdomen and Pelvis With Contrast74177 | 184 | $86 |
| Ct Scan of Abdomen and Pelvis Without Contrast |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-10-12
- Last updated
- 2026-03-05
- Certified
- 2026-03-05
Frequently asked questions
- What is Mark Saker's NPI number?
- Mark Saker's National Provider Identifier (NPI) is 1881783140, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Saker's specialty?
- Mark Saker is listed in the NPPES registry with a primary specialty of Diagnostic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Saker located?
- Mark Saker's practice location on file with NPPES is 836 W Wellington Ave, Chicago, IL 60657.
- What is Mark Saker's phone number?
- The practice phone number listed in the NPPES registry for Mark Saker is (773) 296-7820.
- Does Mark Saker accept Medicare?
- Mark Saker is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Saker's NPI active?
- Yes — Mark Saker's NPI (1881783140) is active in the NPPES registry as of the last update on 2026-03-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.