NICHOLAS DAINIAK M.D.
NPI 1396713467
Internal Medicine in Bridgeport, CT
About Nicholas Dainiak M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
NICHOLAS DAINIAK M.D. (NPI 1396713467) is an individual internal medicine provider in Bridgeport, Connecticut, licensed in Connecticut (017830) and active in the NPI registry since March 2006. He is enrolled in Medicare PECOS and is a graduate of Loyola University Of Chicago, Stritch School Of Medicine (1973).
NPPES Registry Identity
Specialties & Licenses 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
Nicholas Dainiak M.d. 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
4Medicare enrollment records show Nicholas Dainiak reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
New Britain, CT 06052
- Reassigned Medicare billing, Connecticut enrollment
- 745 clinicians in this Medicare group
Willimantic, CT 06226
- Reassigned Medicare billing, Connecticut enrollment
- 302 clinicians in this Medicare group
Hartford, CT 06102
- Reassigned Medicare billing, Connecticut enrollment
- Also billed through NPI 1770696643 (Connecticut)
- 1,333 clinicians in this Medicare group
Norwich, CT 06360
- Reassigned Medicare billing, Connecticut enrollment
- 430 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 2
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 06610 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
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.
BRIDGEPORT, CT 06610
BRIDGEPORT, CT 06610
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 Nicholas Dainiak's NPI number?
The NPI number for Nicholas Dainiak is 1396713467. It was assigned to this individual provider in the NPPES registry on March 14, 2006.
Where is Nicholas Dainiak located?
Nicholas Dainiak practices at 226 Mill Hill Ave 3rd Floor, Bridgeport, CT 06610. The listed phone number is (203) 384-3873.
What is Nicholas Dainiak's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Nicholas Dainiak enrolled in Medicare?
Yes. Nicholas Dainiak 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 Nicholas Dainiak's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Nicholas Dainiak reassigns Medicare benefits to 4 organizations: The Hospital Of Central Connecticut At New Britain General And Bradley (New Britain, CT), Windham Community Memorial Hospital, Inc. (Willimantic, CT), Hartford Hospital (Hartford, CT) and William W Backus Hospital (Norwich, CT). 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 Nicholas Dainiak's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Nicholas Dainiak accept?
Health plans from Anthem Blue Cross and Blue Shield list Nicholas Dainiak 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 Nicholas Dainiak was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 months 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.
# Nicholas Dainiak, M.D. · NPI 1396713467
Internal Medicine physician in Bridgeport, Connecticut. Individual provider, active in the CMS NPPES registry since March 14, 2006.
## Identity
- **NPI:** 1396713467 (Entity type: Individual)
- **Enumerated:** March 14, 2006
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 017830 (Connecticut)
- **Sole proprietor:** No
## Practice location
- **Address:** 226 MILL HILL AVE, 3RD FLOOR, Bridgeport, CT 06610-2811
- **Phone:** (203) 384-3873 · **Fax:** (203) 384-3829
## 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:** 4 organizations under Medicare reassignment (form CMS-855R): The Hospital Of Central Connecticut At New Britain General And Bradley (NPI 1053477075, New Britain, CT); Windham Community Memorial Hospital, Inc. (NPI 1023191467, Willimantic, CT); Hartford Hospital (NPI 1407806391, Hartford, CT); William W Backus Hospital (NPI 1730243536, Norwich, CT) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Loyola University Of Chicago, Stritch School Of Medicine, class of 1973
## Record status
- **NPPES last updated:** July 13, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1396713467) · Data from the CMS NPPES public registry.