DR. JOHN JUN-TSUNG TSAY M.D.
NPI 1164632691
Internal Medicine in Boston, MA
About Dr. John Jun-tsung Tsay M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. JOHN JUN-TSUNG TSAY M.D. (NPI 1164632691) is an individual internal medicine provider in Boston, Massachusetts, licensed in Massachusetts (250564) and active in the NPI registry since May 2007. He is enrolled in Medicare PECOS and is a graduate of Other (2005).
NPPES Registry Identity
Specialties & Licenses 3
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. John Jun-tsung Tsay 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
2Medicare enrollment records show John Tsay reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Chestnut Hill, MA 02467
- Reassigned Medicare billing, Massachusetts enrollment
- 1,317 clinicians in this Medicare group
Boston, MA 02131
- Reassigned Medicare billing, Massachusetts enrollment
- 59 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 02132 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 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
BOSTON, MA 02132
WEST ROXBURY, MA 02132
WEST ROXBURY, MA 02132
WEST ROXBURY, MA 02132
WEST ROXBURY, MA 02132
WEST ROXBURY, MA 02132
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 John Tsay's NPI number?
The NPI number for John Tsay is 1164632691. It was assigned to this individual provider in the NPPES registry on May 23, 2007.
Where is John Tsay located?
John Tsay practices at 1400 Vfw Parkway, Boston, MA 02132. The listed phone number is (857) 203-3000.
What is John Tsay's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is John Tsay enrolled in Medicare?
Yes. John Tsay 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 John Tsay's services?
According to the CMS Revalidation Reassignment List (October 2026 release), John Tsay reassigns Medicare benefits to 2 organizations: Atrius Health, Inc. (Chestnut Hill, MA) and Hebrew Rehabilitation Center (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 John Tsay's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for John Tsay was last updated on January 28, 2014. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 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. John Jun-Tsung Tsay, M.D. · NPI 1164632691
Internal Medicine physician in Boston, Massachusetts. Individual provider, active in the CMS NPPES registry since May 23, 2007.
## Identity
- **NPI:** 1164632691 (Entity type: Individual)
- **Enumerated:** May 23, 2007
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 250564 (Massachusetts)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 1400 VFW PARKWAY, Boston, MA 02132
- **Phone:** (857) 203-3000
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): Atrius Health, Inc. (NPI 1952518391, Chestnut Hill, MA); Hebrew Rehabilitation Center (NPI 1437155967, Boston, MA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2005
## Record status
- **NPPES last updated:** January 28, 2014
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Source: [NPI Profile](https://npiprofile.com/npi/1164632691) · Data from the CMS NPPES public registry.