WILLIAM SACKS MD
NPI 1871537548
Internal Medicine in Milford, CT
About William Sacks Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
WILLIAM SACKS MD (NPI 1871537548) is an individual internal medicine provider in Milford, Connecticut, licensed in Connecticut (027774) and active in the NPI registry since June 2006. He is enrolled in Medicare PECOS and is a graduate of New York Medical College (1983).
NPPES Registry Identity
Specialties & Licenses 2
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
William Sacks 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
3Medicare enrollment records show William Sacks reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Fairfield, CT 06824
- Reassigned Medicare billing, Connecticut enrollment
- 54 clinicians in this Medicare group
Torrington, CT 06790
- Reassigned Medicare billing, Connecticut enrollment
- 288 clinicians in this Medicare group
Hartford, CT 06106
- Reassigned Medicare billing, Connecticut enrollment
- 1,921 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 3
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 06460 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.
Reported Quality Measures
Other Providers at the Same Location NPPES 2
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 William Sacks's NPI number?
The NPI number for William Sacks is 1871537548. It was assigned to this individual provider in the NPPES registry on June 15, 2006.
Where is William Sacks located?
William Sacks practices at 300 Seaside Avenue Milford Hospital, Milford, CT 06460. The listed phone number is (203) 876-4000.
What is William Sacks's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is William Sacks enrolled in Medicare?
Yes. William Sacks 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 William Sacks's services?
According to the CMS Revalidation Reassignment List (October 2026 release), William Sacks reassigns Medicare benefits to 3 organizations: St. Vincents Urgent Care LLC (Fairfield, CT), Neighborhood Health, Inc. (Torrington, CT) and Hartford Healthcare Medical Group Specialists, PLLC (Hartford, 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 William Sacks's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does William Sacks accept?
Health plans from Anthem Blue Cross and Blue Shield list William Sacks 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 William Sacks was last updated on September 19, 2015. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 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.
# William Sacks, MD · NPI 1871537548
Internal Medicine physician in Milford, Connecticut. Individual provider, active in the CMS NPPES registry since June 15, 2006.
## Identity
- **NPI:** 1871537548 (Entity type: Individual)
- **Enumerated:** June 15, 2006
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 027774 (Connecticut)
- **Sole proprietor:** No
## Practice location
- **Address:** 300 SEASIDE AVENUE, MILFORD HOSPITAL, Milford, CT 06460
- **Phone:** (203) 876-4000
## 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:** 3 organizations under Medicare reassignment (form CMS-855R): St. Vincents Urgent Care LLC (NPI 1912305483, Fairfield, CT); Neighborhood Health, Inc. (NPI 1043544489, Torrington, CT); Hartford Healthcare Medical Group Specialists, PLLC (NPI 1023584216, Hartford, CT) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** New York Medical College, class of 1983
## Record status
- **NPPES last updated:** September 19, 2015
- **Other identifiers:** Medicare ID-Type Unspecified 800V51 (NY); Medicare UPIN E28440
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Source: [NPI Profile](https://npiprofile.com/npi/1871537548) · Data from the CMS NPPES public registry.