Mark Youssef, M.D.
NPI 1679910301 · Diagnostic Radiology Physician · Southbury, CT
Enrolled with Medicare as Practitioner - Diagnostic Radiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Youssef, M.D. is a Diagnostic Radiology Physician provider in Southbury, CT (NPI 1679910301).
Provider details
- NPI number
- 1679910301
- Entity type
- Individual
- Primary specialty
- Diagnostic Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 72105 (CT)
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 tenure28% of score
13 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
1,877 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 | 132 | $9 |
| Screening 3d Breast Mammography77063 | 119 | $54 |
| Screening Mammography77067 | 119 | $135 |
| Ct Scan Head Or Brain Without Contrast70450 | 115 | $40 |
| Dxa Bone Density Measurement of Hip, Pelvis, Spine77080 | 98 | $41 |
| Ct Scan of Abdomen and Pelvis With Contrast74177 | 91 | $87 |
Practice location
Mailing address
Additional practice locations (1)
- 56 Franklin StWaterbury, CT 06706-1281Phone: (203) 753-2574
Registry dates
- Enumerated
- 2013-06-04
- Last updated
- 2024-05-24
- Certified
- 2024-05-20
Frequently asked questions
- What is Mark Youssef's NPI number?
- Mark Youssef's National Provider Identifier (NPI) is 1679910301, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Youssef's specialty?
- Mark Youssef is listed in the NPPES registry with a primary specialty of Diagnostic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Youssef located?
- Mark Youssef's practice location on file with NPPES is 385 Main St S, Southbury, CT 06488-4240.
- What is Mark Youssef's phone number?
- The practice phone number listed in the NPPES registry for Mark Youssef is (203) 267-5114.
- Does Mark Youssef accept Medicare?
- Mark Youssef is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Youssef's NPI active?
- Yes — Mark Youssef's NPI (1679910301) is active in the NPPES registry as of the last update on 2024-05-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.