Joann Cong Yin Chang, M.D.
Ophthalmology Physician · Lancaster, MA
Joann Cong Yin Chang, M.D. is an ophthalmology physician with a practice address in Lancaster, Massachusetts, and NPI 1730359100, issued on Mar 2, 2008. Check the license (Massachusetts 243192, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Joann Cong Yin Chang
- Credential
- M.D.
- Primary taxonomy
- Ophthalmology Physician 207W00000X
- License numbers
- 243192 MA
267568 NY
Self-reported in NPPES; status is on the state search - Practice location
- 479 Old Union Tpke, Lancaster, MA 01523
- Phone
- (978) 537-3900
- Enumerated
- Mar 2, 2008
- Record last updated
- May 2, 2022
- Fax
- (978) 537-6030
- Medicare enrollment
- Enrolled (PECOS I20100715000859); accepts Medicare assignment
- Medical or professional school
- University Of Cincinnati College Of Medicine, 2004
- Entity
- Type 1 · individual
8 nearest ophthalmology physician records → All 791 in Massachusetts → Look up another NPI →
Also registered at 479 Old Union Tpke
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Suraj Afshar, O.D.Optometrist1578714150
- Sara Apollonio, O.D.Optometrist1427338755
- Hannah Ashe, LDOOptician1760359616
- Taylor Aucoin, LDOOptician1639757180
- Judy Bavongkhoun, ODOptometrist1104374628
- Elite Bor-Shavit, MDRetina Specialist (Ophthalmology) Physician1104303858
Verify Joann Cong Yin Chang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 243192Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
50% more Medicare Part D claims than the average ophthalmology physician in 2024
2,271 Medicare Part D claims for 731 beneficiaries, against an average of 1,518 among the 16,459 providers of this specialty who prescribed in Part D. Brand-name drugs were 65% of claims.
Most prescribed
- Prednisolone Acetate679 claims
- Ketorolac Tromethamine275 claims
- Restasis199 claims
- Moxifloxacin175 claims
- Bromfenac Sodium144 claims
- Miebo83 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The MIPS final score for 2023 (Medicare payment program): 97 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $1,043.90
14 payments; by number, the most common kind was food and beverage; the largest payer was Alcon Vision LLC. The 13,221 providers of this specialty with any payment received $4,535.02 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- D'Ambrosio Eye Care IncLancaster, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Joann Cong Yin Chang among 791 ophthalmology physician records in Massachusetts
Joann Cong Yin Chang, M.D. is one of 791 ophthalmology physician records with a practice address in Massachusetts. 76% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 60% of them.
- NPI issued2008 · 60% of these records are older, 37% newer
- In a Medicare fileYes · 76% of these records are
- In the CMS Doctors and Clinicians fileYes · 65% of these records are
- Graduated2004 · median 2002 among the 518 with a school on file
- Record last updated2022 · 65% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207W00000X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
6 ophthalmology physician records list a practice address in Lancaster
They are 6 of the 98 NPPES records with a practice address in Lancaster, and 791 ophthalmology physician records in Massachusetts.
All 791 in Massachusetts → Every provider in Lancaster → Ophthalmology Physician nationwide →
The 8 ophthalmology physician records with the nearest ZIP codes
- Francis D'Ambrosio, M.D.Lancaster, MA 015231497789754
- Isaiah Giese, M.D.Lancaster, MA 015231235544933
- Derek Metcalfe, MDLancaster, MA 015231285211979
- Oren Weisberg, M.D.Lancaster, MA 015231427079995
- Bin Wu, M.D.Lancaster, MA 015231437132529
- Amrik Pabley, M.D.Holden, MA 015201467435404
- Bruce Kolbe, M.D.Fiskdale, MA 015181700076841
- Michael Border, MDCharlton, MA 015071396795761
Common questions
What is Joann Cong Yin Chang, M.D.'s NPI number?
Joann Cong Yin Chang, M.D.'s National Provider Identifier (NPI) is 1730359100, issued on Mar 2, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Joann Cong Yin Chang, M.D. located?
The NPPES record lists a practice address at 479 Old Union Tpke, Lancaster, MA, 01523. Phone: (978) 537-3900. Providers update this record themselves, so call before visiting.
How can I verify Joann Cong Yin Chang, M.D.'s license?
NPPES lists Massachusetts license number 243192, as entered by the provider. Search the Massachusetts Board of Registration in Medicine at https://findmydoctor.mass.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Joann Cong Yin Chang, M.D. prescribe under Medicare Part D?
In 2024, Joann Cong Yin Chang, M.D. had 2,271 Medicare Part D claims for 731 beneficiaries; the average among ophthalmology physician prescribers was 1,518. Part D covers Medicare prescriptions only.
What is Joann Cong Yin Chang, M.D.'s MIPS final score?
The 2023 MIPS final score is 97 of 100. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.