ALAN W TSENG MD, PHD
NPI 1518420520
Internal Medicine - Hematology in Northampton, MA
About Alan W Tseng Md, Phd NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ALAN W TSENG MD, PHD (NPI 1518420520) is an individual hematology provider in Northampton, Massachusetts, licensed in Massachusetts (1024260) and active in the NPI registry since April 2019. He is enrolled in Medicare PECOS, is affiliated with Cooley Dickinson Hospital Inc,the, and is a graduate of Louisiana State University School Of Medicine In New Orleans (2018).
NPPES Registry Identity
Specialties & Licenses
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
Alan W Tseng Md, Phd 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 Alan Tseng reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Northampton, MA 01060
- Reassigned Medicare billing, Massachusetts enrollment
- 539 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.
Hospital Affiliations CMS Care Compare 3
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, 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 01060 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.
NORTHAMPTON, MA 01060
NORTHAMPTON, MA 01060
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 Alan Tseng's NPI number?
The NPI number for Alan Tseng is 1518420520. It was assigned to this individual provider in the NPPES registry on April 8, 2019.
Where is Alan Tseng located?
Alan Tseng practices at 30 Locust St, Northampton, MA 01060. The listed phone number is (413) 582-2900.
What is Alan Tseng's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Hematology, with taxonomy code 207RH0000X.
Is Alan Tseng enrolled in Medicare?
Yes. Alan Tseng 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 Alan Tseng's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Alan Tseng reassigns Medicare benefits to 3 organizations: Mass General Brigham Medical Group Western Massachusetts Inc (Northampton, 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 Alan Tseng's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Alan Tseng affiliated with any hospitals?
According to CMS data, Alan Tseng is affiliated with Cooley Dickinson Hospital Inc,the, Massachusetts General Hospital and Brigham And Women's Hospital.
When was this NPI record last updated?
The NPPES record for Alan Tseng was last updated on August 1, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 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.
# Alan W Tseng, MD, PHD · NPI 1518420520
Hematology physician in Northampton, Massachusetts. Individual provider, active in the CMS NPPES registry since April 8, 2019.
## Identity
- **NPI:** 1518420520 (Entity type: Individual)
- **Enumerated:** April 8, 2019
- **Primary specialty:** Internal Medicine - Hematology · taxonomy 207RH0000X
- **State license:** 1024260 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 30 LOCUST ST, Northampton, MA 01060-2052
- **Phone:** (413) 582-2900
## 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): Mass General Brigham Medical Group Western Massachusetts Inc (NPI 1295787919, Northampton, 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:** Louisiana State University School Of Medicine In New Orleans, class of 2018
## Record status
- **NPPES last updated:** August 1, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1518420520) · Data from the CMS NPPES public registry.