Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Dr. Weijen William Chang, MD

Individual provider Internal Medicine Physician · NPI 1235174103

Dr. Weijen William Chang, MD is a Hospitalist in Springfield, Massachusetts. Qualified in 1994, 32 years ago. Practices with Hospital Medicine Services of Fl, LLC, a 503-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Massachusetts.

Years since qualifying
32
Licensed in
MA
In the registry since
2006
Specialties on file
3
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

759 Chestnut St
Springfield, MA 01107-1619
Phone: (413) 794-2398
Fax: (413) 794-1273
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 200 W Arbor Dr, San Diego, CA 92103-9000 — (858) 249-6748

Specialties & licences

Pediatrics Physician (primary) Taxonomy 208000000X · Licence 157873 (MA)
Internal Medicine Physician Taxonomy 207R00000X · Licence 157873 (MA)
Hospitalist Physician Taxonomy 208M00000X · Licence 157873 (MA)

Record details

NPI number1235174103
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 17, 2006
Last updated in NPPESMarch 17, 2018

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyHOSPITALIST
Medical schoolOTHER
Graduated 1994 (32 years in practice)
Group practice Hospital Medicine Services Of Fl, Llc — 503 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

Other providers in Springfield