PATRICK J CAHILL D.O.
NPI 1134229909
Obstetrics & Gynecology in Stamford, CT
About Patrick J Cahill D.o. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
PATRICK J CAHILL D.O. (NPI 1134229909) is an individual obstetrics & gynecology provider in Stamford, Connecticut, licensed in Connecticut (000548) and active in the NPI registry since September 2006. He is enrolled in Medicare PECOS and is a graduate of New York College Of Osteo Medicine Of New York Institute Of Technology (1996).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 2
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
Patrick J Cahill D.o. 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 Reassignment
Medicare enrollment records show Patrick Cahill reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Stamford, CT 06905
- Reassigned Medicare billing, Connecticut enrollment
- 6 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.
Areas of Expertise CMS Part B claims 4
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 06905 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.
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 Patrick Cahill's NPI number?
The NPI number for Patrick Cahill is 1134229909. It was assigned to this individual provider in the NPPES registry on September 22, 2006.
Where is Patrick Cahill located?
Patrick Cahill practices at 999 Summer St Suite 401, Stamford, CT 06905. The listed phone number is (203) 353-9099.
What is Patrick Cahill's specialty?
The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.
Is Patrick Cahill enrolled in Medicare?
Yes. Patrick Cahill 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 organization bills Medicare for Patrick Cahill's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Patrick Cahill reassigns Medicare benefits to Coastal Obstetrics And Gynecology PC (Stamford, CT). The 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 Patrick Cahill's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Patrick Cahill accept?
Health plans from Anthem Blue Cross and Blue Shield list Patrick Cahill 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 Patrick Cahill was last updated on June 13, 2013. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 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.
# Patrick J Cahill, D.O. · NPI 1134229909
Obstetrics & Gynecology physician in Stamford, Connecticut. Individual provider, active in the CMS NPPES registry since September 22, 2006.
## Identity
- **NPI:** 1134229909 (Entity type: Individual)
- **Enumerated:** September 22, 2006
- **Primary specialty:** Obstetrics & Gynecology · taxonomy 207V00000X
- **State license:** 000548 (Connecticut)
- **Sole proprietor:** No
## Practice location
- **Address:** 999 SUMMER ST, SUITE 401, Stamford, CT 06905-5546
- **Phone:** (203) 353-9099 · **Fax:** (203) 353-9699
## 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:** Coastal Obstetrics And Gynecology PC (NPI 1679842611, Stamford, CT), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** New York College Of Osteo Medicine Of New York Institute Of Technology, class of 1996
## Record status
- **NPPES last updated:** June 13, 2013
- **Other identifiers:** Other 000548 (CT); Medicare UPIN D80838 (CT)
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Source: [NPI Profile](https://npiprofile.com/npi/1134229909) · Data from the CMS NPPES public registry.