DR. WEIJEN WILLIAM CHANG M.D.
NPI 1235174103
Pediatrics in Springfield, MA
About Dr. Weijen William Chang M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. WEIJEN WILLIAM CHANG M.D. (NPI 1235174103) is an individual pediatrics provider in Springfield, Massachusetts, licensed in Massachusetts (157873) and active in the NPI registry since June 2006. He is enrolled in Medicare PECOS, is affiliated with Baystate Medical Center, and maintains a secondary practice location in San Diego.
NPPES Registry Identity
Specialties & Licenses 3
Secondary Practice Location 1
Other Identifiers 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
Dr. Weijen William Chang 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 Weijen Chang reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Springfield, MA 01199
- Reassigned Medicare billing, Massachusetts enrollment
- 1,537 clinicians in this Medicare group
Aventura, FL 33180
- Reassigned Medicare billing, Florida enrollment
- 861 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.
Baystate Medical Center
Acute Care Hospitals · Springfield, MAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 01107 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.
SPRINGFIELD, MA 01107
SPRINGFIELD, MA 01107
SPRINGFIELD, MA 01107
SPRINGFIELD, MA 01107
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 Weijen Chang's NPI number?
The NPI number for Weijen Chang is 1235174103. It was assigned to this individual provider in the NPPES registry on June 17, 2006.
Where is Weijen Chang located?
Weijen Chang practices at 759 Chestnut Street, Springfield, MA 01107. The listed phone number is (413) 794-2398.
What is Weijen Chang's specialty?
The primary specialty registered for this NPI is Pediatrics with taxonomy code 208000000X.
Is Weijen Chang enrolled in Medicare?
Yes. Weijen Chang 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 Weijen Chang's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Weijen Chang reassigns Medicare benefits to 2 organizations: Baystate Medical Practices, Inc (Springfield, MA) and Hospital Medicine Services Of Fl, LLC (Aventura, FL). 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 Weijen Chang's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Weijen Chang accept?
Health plans from Oscar Health Maintenance Organization of Florida and Taro Health list Weijen Chang 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 Weijen Chang affiliated with any hospitals?
According to CMS data, Weijen Chang is affiliated with Baystate Medical Center.
When was this NPI record last updated?
The NPPES record for Weijen Chang was last updated on March 17, 2018. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 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. Weijen William Chang, M.D. · NPI 1235174103
Pediatrics physician in Springfield, Massachusetts. Individual provider, active in the CMS NPPES registry since June 17, 2006.
## Identity
- **NPI:** 1235174103 (Entity type: Individual)
- **Enumerated:** June 17, 2006
- **Primary specialty:** Pediatrics · taxonomy 208000000X
- **State license:** 157873 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 759 CHESTNUT STREET, Springfield, MA 01107-1619
- **Phone:** (413) 794-2398 · **Fax:** (413) 794-1273
## 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): Baystate Medical Practices, Inc (NPI 1548205909, Springfield, MA); Hospital Medicine Services Of Fl, LLC (NPI 1710684857, Aventura, FL) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1994
## Record status
- **NPPES last updated:** March 17, 2018
- **Other identifiers:** Medicaid 3181812 (MA)
---
Source: [NPI Profile](https://npiprofile.com/npi/1235174103) · Data from the CMS NPPES public registry.