Stephen O'Mahony, MD
NPI 1144291162 · Internal Medicine Physician · Norwalk, CT
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Stephen O'Mahony, MD is a Internal Medicine Physician provider in Norwalk, CT (NPI 1144291162).
Provider details
- NPI number
- 1144291162
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 037765 (CT)
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 tenure38% of score
20 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-01-28
- Last updated
- 2008-10-01
Frequently asked questions
- What is Stephen O'Mahony's NPI number?
- Stephen O'Mahony's National Provider Identifier (NPI) is 1144291162, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Stephen O'Mahony's specialty?
- Stephen O'Mahony is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Stephen O'Mahony located?
- Stephen O'Mahony's practice location on file with NPPES is 24 Stevens St, Norwalk, CT 06850-3852.
- What is Stephen O'Mahony's phone number?
- The practice phone number listed in the NPPES registry for Stephen O'Mahony is (203) 852-2375.
- Does Stephen O'Mahony accept Medicare?
- Stephen O'Mahony is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Stephen O'Mahony's NPI active?
- Yes — Stephen O'Mahony's NPI (1144291162) is active in the NPPES registry as of the last update on 2008-10-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.