DR. TIMOTHY W TSAI M.D.
NPI 1740387356
Emergency Medicine in West Tisbury, MA
About Dr. Timothy W Tsai M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. TIMOTHY W TSAI M.D. (NPI 1740387356) is an individual emergency medicine provider in West Tisbury, Massachusetts, licensed in Massachusetts (76209) and active in the NPI registry since September 2006. He is enrolled in Medicare PECOS, is affiliated with Martha's Vineyard Hospital Inc, and is a graduate of Saint Louis University School Of Medicine (1988).
NPPES Registry Identity
Specialties & Licenses
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
Dr. Timothy W Tsai 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 Timothy Tsai reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Oak Bluffs, MA 02557
- Reassigned Medicare billing, Massachusetts enrollment
- Also billed through NPI 1194866210 (Massachusetts)
- 184 clinicians in this Medicare group
Nantucket, MA 02554
- Reassigned Medicare billing, Massachusetts enrollment
- 206 clinicians in this Medicare group
East Boston, MA 02128
- Reassigned Medicare billing, Massachusetts enrollment
- 577 clinicians in this Medicare group
East Boston, MA 02128
- Reassigned Medicare billing, Massachusetts enrollment
- Medicare enrollment name: East Boston Neighborhood Health Center Corp
- 456 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.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Martha's Vineyard Hospital Inc
Critical Access Hospitals · Oak Bluffs, MAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 02575 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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 Timothy Tsai's NPI number?
The NPI number for Timothy Tsai is 1740387356. It was assigned to this individual provider in the NPPES registry on September 19, 2006.
Where is Timothy Tsai located?
Timothy Tsai practices at 65 Music Street, West Tisbury, MA 02575. The listed phone number is (508) 560-2120.
What is Timothy Tsai's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Timothy Tsai enrolled in Medicare?
Yes. Timothy Tsai 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 Timothy Tsai's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Timothy Tsai reassigns Medicare benefits to 4 organizations: Martha's Vineyard Hospital, Inc. (Oak Bluffs, MA), Nantucket Cottage Hospital (Nantucket, MA), Internal Medical Associates-Ebnhc (East Boston, MA) and Neighborhealth Corporation (East Boston, 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 Timothy Tsai's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Timothy Tsai accept?
Health plans from Taro Health list Timothy Tsai 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.
Is Timothy Tsai affiliated with any hospitals?
According to CMS data, Timothy Tsai is affiliated with Martha's Vineyard Hospital Inc.
When was this NPI record last updated?
The NPPES record for Timothy Tsai was last updated on October 15, 2012. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 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.
# Dr. Timothy W Tsai, M.D. · NPI 1740387356
Emergency Medicine physician in West Tisbury, Massachusetts. Individual provider, active in the CMS NPPES registry since September 19, 2006.
## Identity
- **NPI:** 1740387356 (Entity type: Individual)
- **Enumerated:** September 19, 2006
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** 76209 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 65 MUSIC STREET, West Tisbury, MA 02575
- **Phone:** (508) 560-2120
## 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): Martha's Vineyard Hospital, Inc. (NPI 1134206386, Oak Bluffs, MA); Nantucket Cottage Hospital (NPI 1447214622, Nantucket, MA); Internal Medical Associates-Ebnhc (NPI 1558481879, East Boston, MA); Neighborhealth Corporation (NPI 1316994411, East Boston, MA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Saint Louis University School Of Medicine, class of 1988
## Record status
- **NPPES last updated:** October 15, 2012
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Source: [NPI Profile](https://npiprofile.com/npi/1740387356) · Data from the CMS NPPES public registry.