GIAC CHAN NGUYEN TAN M.D.
NPI 1962585042
Internal Medicine in Waterbury, CT
About Giac Chan Nguyen Tan M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
GIAC CHAN NGUYEN TAN M.D. (NPI 1962585042) is an individual internal medicine provider in Waterbury, Connecticut, licensed in Connecticut (028148) and active in the NPI registry since October 2006. He is enrolled in Medicare PECOS and is a graduate of Other (1984).
NPPES Registry Identity
Specialties & Licenses 3
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
Giac Chan Nguyen Tan 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 Reassignment
Medicare enrollment records show Giac Chan Nguyen Tan reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Meriden, CT 06451
- Reassigned Medicare billing, Connecticut enrollment
- 505 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
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 06708 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.
WATERBURY, CT 06708
WATERBURY, CT 06708
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 Giac Chan Nguyen Tan's NPI number?
The NPI number for Giac Chan Nguyen Tan is 1962585042. It was assigned to this individual provider in the NPPES registry on October 23, 2006.
Where is Giac Chan Nguyen Tan located?
Giac Chan Nguyen Tan practices at 171 Grandview Ave Ste 105, Waterbury, CT 06708. The listed phone number is (203) 694-8200.
What is Giac Chan Nguyen Tan's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Giac Chan Nguyen Tan enrolled in Medicare?
Yes. Giac Chan Nguyen Tan 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 Giac Chan Nguyen Tan's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Giac Chan Nguyen Tan reassigns Medicare benefits to Midstate Medical Center (Meriden, 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 Giac Chan Nguyen Tan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Giac Chan Nguyen Tan accept?
Health plans from Anthem Blue Cross and Blue Shield list Giac Chan Nguyen Tan 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 Giac Chan Nguyen Tan was last updated on February 16, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.
# Giac Chan Nguyen Tan, M.D. · NPI 1962585042
Internal Medicine physician in Waterbury, Connecticut. Individual provider, active in the CMS NPPES registry since October 23, 2006.
## Identity
- **NPI:** 1962585042 (Entity type: Individual)
- **Enumerated:** October 23, 2006
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 028148 (Connecticut)
- **Sole proprietor:** No
## Practice location
- **Address:** 171 GRANDVIEW AVE, STE 105, Waterbury, CT 06708-2519
- **Phone:** (203) 694-8200
## 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:** Midstate Medical Center (NPI 1154425288, Meriden, CT), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1984
## Record status
- **NPPES last updated:** February 16, 2022
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Source: [NPI Profile](https://npiprofile.com/npi/1962585042) · Data from the CMS NPPES public registry.