DR. HARRISON TSAI M.D.
NPI 1164845343
Pathology - Molecular Genetic Pathology in Boston, MA
About Dr. Harrison Tsai M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. HARRISON TSAI M.D. (NPI 1164845343) is an individual molecular genetic pathology provider in Boston, Massachusetts, licensed in Massachusetts (282556) and active in the NPI registry since January 2014. He is enrolled in Medicare PECOS, is affiliated with Cooley Dickinson Hospital Inc,the, and maintains 2 additional practice locations.
NPPES Registry Identity
Specialties & Licenses 3
Secondary Practice Locations 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
Dr. Harrison 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 Harrison Tsai reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Boston, MA 02115
- Reassigned Medicare billing, Massachusetts enrollment
- 35 clinicians in this Medicare group
Boston, MA 02115
- Reassigned Medicare billing, Massachusetts enrollment
- 4,574 clinicians in this Medicare group
Boston, MA 02114
- Reassigned Medicare billing, Massachusetts enrollment
- 6,234 clinicians in this Medicare group
Boston, MA 02114
- Reassigned Medicare billing, Massachusetts enrollment
- 6,360 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.
Hospital Affiliations CMS Care Compare 4
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Cooley Dickinson Hospital Inc,the
Acute Care Hospitals · Northampton, MANorth Shore Medical Center -
Acute Care Hospitals · Salem, MAMassachusetts General Hospital
Acute Care Hospitals · Boston, MABrigham And Women's Hospital
Acute Care Hospitals · Boston, MAPhysician 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 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
BOSTON, MA 02115
BOSTON, MA 02115
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 Harrison Tsai's NPI number?
The NPI number for Harrison Tsai is 1164845343. It was assigned to this individual provider in the NPPES registry on January 24, 2014.
Where is Harrison Tsai located?
Harrison Tsai practices at 300 Longwood Ave, Boston, MA 02115. The listed phone number is (617) 355-6000.
What is Harrison Tsai's specialty?
The primary specialty registered for this NPI is Pathology, specializing in Molecular Genetic Pathology, with taxonomy code 207ZP0007X.
Is Harrison Tsai enrolled in Medicare?
Yes. Harrison 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 Harrison Tsai's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Harrison Tsai reassigns Medicare benefits to 4 organizations: Children's Hospital Pathology Foundation, Inc. (Boston, MA), Brigham & Womens Physicians Organization Inc (Boston, MA), The General Hospital Corporation (Boston, MA) and Massachusetts General Physicians Organization Inc (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 Harrison Tsai's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Harrison Tsai accept?
Health plans from Taro Health list Harrison 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 Harrison Tsai affiliated with any hospitals?
According to CMS data, Harrison Tsai is affiliated with Cooley Dickinson Hospital Inc,the, North Shore Medical Center -, Massachusetts General Hospital and Brigham And Women's Hospital.
When was this NPI record last updated?
The NPPES record for Harrison Tsai was last updated on May 1, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 months 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. Harrison Tsai, M.D. · NPI 1164845343
Molecular Genetic Pathology physician in Boston, Massachusetts. Individual provider, active in the CMS NPPES registry since January 24, 2014.
## Identity
- **NPI:** 1164845343 (Entity type: Individual)
- **Enumerated:** January 24, 2014
- **Primary specialty:** Pathology - Molecular Genetic Pathology · taxonomy 207ZP0007X
- **State license:** 282556 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 300 LONGWOOD AVE, Boston, MA 02115-5724
- **Phone:** (617) 355-6000
## 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): Children's Hospital Pathology Foundation, Inc. (NPI 1376502112, Boston, MA); Brigham & Womens Physicians Organization Inc (NPI 1033535497, Boston, MA); The General Hospital Corporation (NPI 1023049236, Boston, MA); Massachusetts General Physicians Organization Inc (NPI 1801874573, Boston, MA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Harvard Medical School, class of 2016
## Record status
- **NPPES last updated:** May 1, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1164845343) · Data from the CMS NPPES public registry.