SARAH WILLIAMS
NPI 1891285409
Optometrist in Boston, MA
About Sarah Williams NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
SARAH WILLIAMS (NPI 1891285409) is an individual optometrist in Boston, Massachusetts, licensed in Massachusetts (5283) and active in the NPI registry since May 2018. She is enrolled in Medicare PECOS, maintains a secondary practice location in Boston, and is a graduate of New England College Of Optometry (2018).
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
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
Sarah Williams 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 Sarah Williams reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Boston, MA 02215
- Reassigned Medicare billing, Massachusetts enrollment
- 63 clinicians in this Medicare group
South Boston, MA 02127
- Reassigned Medicare billing, Massachusetts enrollment
- 3 clinicians in this Medicare group
North Easton, MA 02356
- Reassigned Medicare billing, Massachusetts enrollment
- 12 clinicians in this Medicare group
Mansfield, MA 02048
- Reassigned Medicare billing, Massachusetts enrollment
- 16 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 02115 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 9
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
BOSTON, MA 02115
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 Sarah Williams's NPI number?
The NPI number for Sarah Williams is 1891285409. It was assigned to this individual provider in the NPPES registry on May 18, 2018.
Where is Sarah Williams located?
Sarah Williams practices at 424 Beacon St, Boston, MA 02115. The listed phone number is (617) 823-8104.
What is Sarah Williams's specialty?
The primary specialty registered for this NPI is Optometrist with taxonomy code 152W00000X.
Is Sarah Williams enrolled in Medicare?
Yes. Sarah Williams 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 Sarah Williams's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Sarah Williams reassigns Medicare benefits to 4 organizations: New England Eye Institute Inc. (Boston, MA), Wink Eyecare, Inc. (South Boston, MA), Easton Vision PC (North Easton, MA) and Bay Eye Center PC (Mansfield, MA). 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 Sarah Williams's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Sarah Williams accept?
Health plans from Anthem Blue Cross and Blue Sheld, Anthem Blue Cross and Blue Shield, Blue Cross and Blue Shield of Montana, Blue Cross and Blue Shield of Oklahoma and Blue Cross and Blue Shield of Texas and 1 other insurer list Sarah Williams 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 Sarah Williams was last updated on February 5, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.
# Sarah Williams · NPI 1891285409
Optometrist provider in Boston, Massachusetts. Individual provider, active in the CMS NPPES registry since May 18, 2018.
## Identity
- **NPI:** 1891285409 (Entity type: Individual)
- **Enumerated:** May 18, 2018
- **Primary specialty:** Optometrist · taxonomy 152W00000X
- **State license:** 5283 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 424 BEACON ST, Boston, MA 02115
- **Phone:** (617) 823-8104
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health
- **Bills Medicare through:** 4 organizations under Medicare reassignment (form CMS-855R): New England Eye Institute Inc. (NPI 1487607388, Boston, MA); Wink Eyecare, Inc. (NPI 1992126023, South Boston, MA); Easton Vision PC (NPI 1942016217, North Easton, MA); Bay Eye Center PC (NPI 1790700946, Mansfield, MA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** New England College Of Optometry, class of 2018
## Record status
- **NPPES last updated:** February 5, 2020
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Source: [NPI Profile](https://npiprofile.com/npi/1891285409) · Data from the CMS NPPES public registry.