Greg Marrinan, MD
NPI 1942295506 · Diagnostic Radiology Physician · Shelton, CT
Enrolled with Medicare as Practitioner - Diagnostic Radiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Greg Marrinan, MD is a Diagnostic Radiology Physician provider in Shelton, CT (NPI 1942295506).
Provider details
- NPI number
- 1942295506
- Entity type
- Individual
- Primary specialty
- Diagnostic Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 041344 (CT)
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
20 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
2,016 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 | 514 | $9 |
| X-Ray of Chest, 2 Views71046 | 114 | $11 |
| Ct Scan Head Or Brain Without Contrast70450 | 104 | $39 |
| Ct Scan of Abdomen and Pelvis With Contrast74177 | 95 | $87 |
| X-Ray of Chest, 2 Views71046 | 86 | $24 |
| Mri Scan of Leg Joint Without Contrast73721 | 86 | $211 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-09-20
- Last updated
- 2023-09-07
- Certified
- 2023-09-07
Frequently asked questions
- What is Greg Marrinan's NPI number?
- Greg Marrinan's National Provider Identifier (NPI) is 1942295506, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Greg Marrinan's specialty?
- Greg Marrinan is listed in the NPPES registry with a primary specialty of Diagnostic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is Greg Marrinan located?
- Greg Marrinan's practice location on file with NPPES is 1 Corporate Dr Ste 325, Shelton, CT 06484-6295.
- What is Greg Marrinan's phone number?
- The practice phone number listed in the NPPES registry for Greg Marrinan is (203) 696-6125.
- Does Greg Marrinan accept Medicare?
- Greg Marrinan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Greg Marrinan's NPI active?
- Yes — Greg Marrinan's NPI (1942295506) is active in the NPPES registry as of the last update on 2023-09-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.