DR. STEPHEN O'MAHONY MD
NPI 1144291162
Internal Medicine in Norwalk, CT
About Dr. Stephen O'mahony Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. STEPHEN O'MAHONY MD (NPI 1144291162) is an individual internal medicine provider in Norwalk, Connecticut, licensed in Connecticut (037765) and active in the NPI registry since January 2006. He is enrolled in Medicare PECOS and is a graduate of University Of Connecticut School Of Medicine (1996).
NPPES Registry Identity
Specialties & Licenses 3
Other Identifiers 10
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Stephen O'mahony Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
2Medicare enrollment records show Stephen O'mahony reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Elizabeth, NJ 07202
- Reassigned Medicare billing, New Jersey enrollment
- 1,894 clinicians in this Medicare group
West Orange, NJ 07052
- Reassigned Medicare billing, New Jersey enrollment
- 428 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 06850 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
NORWALK, CT 06850
NORWALK, CT 06850
NORWALK, CT 06850
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Stephen O'mahony's NPI number?
The NPI number for Stephen O'mahony is 1144291162. It was assigned to this individual provider in the NPPES registry on January 28, 2006.
Where is Stephen O'mahony located?
Stephen O'mahony practices at 24 Stevens St, Norwalk, CT 06850. The listed phone number is (203) 852-2375.
What is Stephen O'mahony's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Stephen O'mahony enrolled in Medicare?
Yes. Stephen O'mahony is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Stephen O'mahony's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Stephen O'mahony reassigns Medicare benefits to 2 organizations: Barnabas Health Medical Group PC (Elizabeth, NJ) and Rwjbh Primary Care Services (West Orange, NJ). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Stephen O'mahony's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Stephen O'mahony accept?
Health plans from Ambetter Health and Oscar Health list Stephen O'mahony as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for Stephen O'mahony was last updated on October 1, 2008. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. Stephen O'mahony, MD · NPI 1144291162
Internal Medicine physician in Norwalk, Connecticut. Individual provider, active in the CMS NPPES registry since January 28, 2006.
## Identity
- **NPI:** 1144291162 (Entity type: Individual)
- **Enumerated:** January 28, 2006
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 037765 (Connecticut)
- **Sole proprietor:** No
## Practice location
- **Address:** 24 STEVENS ST, Norwalk, CT 06850-3852
- **Phone:** (203) 852-2375
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Barnabas Health Medical Group PC (NPI 1841557246, Elizabeth, NJ); Rwjbh Primary Care Services (NPI 1265037501, West Orange, NJ) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Connecticut School Of Medicine, class of 1996
## Record status
- **NPPES last updated:** October 1, 2008
- **Other identifiers:** Medicare UPIN H05602; Medicaid 001377656 (CT); Other 37765 (CT); and 7 more
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Source: [NPI Profile](https://npiprofile.com/npi/1144291162) · Data from the CMS NPPES public registry.