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

Dr. Joseph Yun Jo Chang, MD

Individual provider Gastroenterology Physician · NPI 1417968256

Dr. Joseph Yun Jo Chang, MD practises Gastroenterology in Denver, Colorado. Qualified in 2005, 21 years ago. Practices with Altru Health System, a 667-clinician group, works from 4 locations and accepts Medicare assignment. Licensed in Colorado and Washington.

Years since qualifying
21
Licensed in
CO, WA
In the registry since
2006
Specialties on file
2
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

777 Bannock St # MC3240
Denver, CO 80204-4507
Phone: (303) 436-6000
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (3)

  • 10350 E Dakota Ave, Denver, CO 80247-1314 — (303) 338-4545
  • 210 9th St Se Ste 1, Rochester, MN 55904 — (507) 288-3443
  • 505 Ne 87th Ave Ste 301, Vancouver, WA 98664-1965 — (360) 514-7274

Specialties & licences

Gastroenterology Physician (primary) Taxonomy 207RG0100X · Licence DR.0070441 (CO)
Gastroenterology Physician Taxonomy 207RG0100X · Licence MD60212074 (WA)

Record details

NPI number1417968256
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedAugust 10, 2006
Last updated in NPPESAugust 9, 2023
Certification dateAugust 9, 2023

Medicare enrollment

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

Medicare specialtyGASTROENTEROLOGY
Also practisesINTERNAL MEDICINE
Medical schoolOTHER
Graduated 2005 (21 years in practice)
Group practice Altru Health System — 667 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 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 412 times · 98th percentile
Colonoscopy 168 times · 91st percentile

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 patients290
Services billed 463 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

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.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $169 2 payments · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

  • Altru Hospital Hospital · Grand Forks, ND

Colleagues at Altru Health System

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 667 clinicians in the practice; 12 are shown here.

Other providers in Denver