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

Dr. Alexander W. Jahng, MD

Individual provider Internal Medicine Physician · NPI 1295927390

Dr. Alexander W. Jahng, MD practises Gastroenterology in Orange, California. Graduated from University of California, Irvine, California College of Medicine in 2006, 20 years ago. Practices with Faculty Physicians and Surgeons of Llusm, a 1,308-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in California.

Years since qualifying
20
Trained at
University of California, Irvine, California College of Medicine
Licensed in
CA
In the registry since
2007
Specialties on file
4
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

101 The City Dr S
Orange, CA 92868-3201
Phone: (714) 880-7812
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 1000 W. Carson Street, Torrance, CA 90509 — (310) 222-2409

Specialties & licences

Gastroenterology Physician (primary) Taxonomy 207RG0100X · Licence A101800 (CA)
Internal Medicine Physician Taxonomy 207R00000X · Licence A101800 (CA)
General Practice Physician Taxonomy 208D00000X · Licence A101800 (CA)
Hospitalist Physician Taxonomy 208M00000X · Licence A101800 (CA)

Record details

NPI number1295927390
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedAugust 13, 2007
Last updated in NPPESFebruary 7, 2023
Certification dateFebruary 7, 2023

Medicare enrollment

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

Medicare specialtyGASTROENTEROLOGY
Medical schoolUNIVERSITY OF CALIFORNIA, IRVINE, CALIFORNIA COLLEGE OF MEDICINE
Graduated 2006 (20 years in practice)
Group practice Faculty Physicians And Surgeons Of Llusm — 1308 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations4 on file with Medicare

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Upper gastrointestinal (GI) endoscopy for acid reflux 46 times · 62nd percentile
Colonoscopy 1–10 times

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients33
Services billed 81 a service is one billed item, such as a visit, a test or a procedure
Average patient age66

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Faculty Physicians and Surgeons of Llusm

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 1308 clinicians in the practice; 12 are shown here.

Other providers in Orange