Dr. Joann Cong Yin Chang, MD

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.

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.

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.

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.

• Umass Memorial Healthalliance Hospitals Hospital · Leominster, MA · listed as Umass Memorial Healthalliance Clinton Hospital Inc
• Umass Memorial Medical Center/University Campus Hospital · Worcester, MA · listed as Umass Memorial Medical Center

Colleagues at D'Ambrosio Eye Care Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice.

• Elite Bor-Shavit, MD Retina Specialist (Ophthalmology) Physician · Lancaster, MA
• Michael M Fu, OD Optometrist · Lancaster, MA
• Isaiah W Giese, MD Ophthalmic Plastic and Reconstructive Surgery Physician · Lancaster, MA
• Dr. Anna Krawiec, OD Optometrist · Lancaster, MA
• John Marabello, OD Optometrist · Lancaster, MA
• Derek J Metcalfe, MD Ophthalmology Physician · Lancaster, MA
• Dr. Khyla Eval Osaretin, OD Optometrist · Lancaster, MA
• Prinal M Patel, OD Optometrist · Lancaster, MA
• Jacqueline Weadick, OD Optometrist · Lancaster, MA
• Oren L Weisberg, MD Ophthalmology Physician · Lancaster, MA

Other providers in Lancaster

• Dr. Francis A D'Ambrosio Jr., MD

  Individual Ophthalmology Physician · NPI 1497789754

  479 Old Union Tpke, Lancaster, MA 01523-3029 · (978) 537-3900

• Derek J Metcalfe, MD

  Individual Ophthalmology Physician · NPI 1285211979

  479 Old Union Tpke, Lancaster, MA 01523-3029 · (978) 537-3900

• Oren L Weisberg, MD

  Individual Ophthalmology Physician · NPI 1427079995

  479 Old Union Tpke, Lancaster, MA 01523-3029 · (978) 537-3900

• Bin Wu, MD

  Individual Ophthalmology Physician · NPI 1437132529

  479 Old Union Tpke, Lancaster, MA 01523-3029 · (978) 537-3900