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

Dr. Mary Ellen Chang, DO

Individual provider Student in an Organized Health Care Education/Training Program · NPI 1649891987

Dr. Mary Ellen Chang, DO is an Emergency Medicine in San Antonio, Texas. Qualified in 2020, 6 years ago. Practices with Ies ER Oklahoma LLC, a 128-clinician group and accepts Medicare assignment. Licensed in Texas.

Years since qualifying
6
Licensed in
TX
In the registry since
2020
Specialties on file
2
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

7703 Floyd Curl Dr # 7736
San Antonio, TX 78229-3901
Phone: (210) 567-4621
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence T7889 (TX)
Student in an Organized Health Care Education/Training Program Taxonomy 390200000X · Licence BP10070592 (TX)

Record details

NPI number1649891987
Entity typeIndividual (Type 1)
GenderFemale
Credentials DO
Sole proprietorNo
NPI enumeratedApril 28, 2020
Last updated in NPPESJuly 8, 2022
Certification dateJuly 8, 2022
Mailing address21630 Milsa Dr Apt 2302, San Antonio, TX 78256-2502

Medicare enrollment

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

Medicare specialtyEMERGENCY MEDICINE
Medical schoolOTHER
Graduated 2020 (6 years in practice)
Group practice Ies Er Oklahoma Llc — 128 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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