Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Dr. Mark Joshua Chang, DO

Individual provider Internal Medicine Physician · NPI 1861954182

Dr. Mark Joshua Chang, DO is a Hematology/Oncology in Upland, California. Qualified in 2019, 7 years ago. Practices as a sole proprietor. Licensed in California and Nevada.

Years since qualifying
7
Licensed in
CA, NV
In the registry since
2019
Specialties on file
3
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

1100 San Bernardino Rd Ste 1100
Upland, CA 91786-4952
Phone: (909) 949-2242
Fax: (909) 981-5783
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Hematology & Oncology Physician (primary) Taxonomy 207RH0003X · Licence 20A24887 (CA)
Internal Medicine Physician Taxonomy 207R00000X · Licence DO3131 (NV)
Medical Oncology Physician Taxonomy 207RX0202X · Licence 20A24887 (CA)

Record details

NPI number1861954182
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorYes
NPI enumeratedApril 4, 2019
Last updated in NPPESJuly 8, 2026
Certification dateJuly 8, 2026
Mailing addressPo Box 512185, Los Angeles, CA 90051-0185

Medicare enrollment

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

Medicare specialtyHEMATOLOGY/ONCOLOGY
Medical schoolOTHER
Graduated 2019 (7 years in practice)
Accepts Medicare assignment Not indicated
Practice locations3 on file with Medicare

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