Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
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Dr. Avian Chien Leong Vincent Chang, MD

Individual provider Surgery Physician · NPI 1700271178

Dr. Avian Chien Leong Vincent Chang, MD practises General Surgery in Bangor, Maine. Qualified in 2014, 12 years ago. Practices with Eastern Maine Medical Center, a 659-clinician group and accepts Medicare assignment. Licensed in Maine, Missouri and Pennsylvania.

Years since qualifying
12
Licensed in
ME, MO, PA
In the registry since
2015
Specialties on file
6
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

417 State St Ste 340
Bangor, ME 04401-6634
Phone: (207) 973-4949
Show map & directions

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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Surgery Physician (primary) Taxonomy 208600000X · Licence MD24256 (ME)
Surgery Physician Taxonomy 208600000X · Licence MT207986 (PA)
Surgical Critical Care Physician Taxonomy 2086S0102X · Licence 2020016495 (MO)
Surgical Critical Care Physician Taxonomy 2086S0102X · Licence MD470306 (PA)
Surgical Critical Care Physician Taxonomy 2086S0102X · Licence MD24256 (ME)
Trauma Surgery Physician Taxonomy 2086S0127X · Licence MD24256 (ME)

Record details

NPI number1700271178
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedApril 2, 2015
Last updated in NPPESMarch 10, 2022
Certification dateMarch 10, 2022

Medicare enrollment

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

Medicare specialtyGENERAL SURGERY
Medical schoolOTHER
Graduated 2014 (12 years in practice)
Group practice Eastern Maine Medical Center — 659 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 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.

Hernia repair - groin (open) 1–10 times
Removal of tissue 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 patients114
Services billed 166 a service is one billed item, such as a visit, a test or a procedure
Average patient age74

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.

Travel and Lodging $1,074 4 payments · travel or lodging paid or reimbursed, such as to attend a conference
Food and Beverage $498 4 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.

Colleagues at Eastern Maine Medical Center

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 659 clinicians in the practice; 12 are shown here.

Other providers in Bangor