NPI registry status
Active
2026 NPPES data Ophthalmology Physician NPI 1184882870
Verify on CMS → Han-Ying Chang
Ophthalmology Physician in Boston, Massachusetts.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 22,082 in Ophthalmology Physician, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
428
Medicare Part D claims · 122 beneficiaries · Ophthalmology Physician avg: 1K
Generic prescribing
53%
generic claims · 47% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$13.88
1 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2023
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Han-Ying Chang filed 428 Medicare Part D claims in 2023 as a Ophthalmology Physician in Boston, Massachusetts, prescribing 53% generic.
- 428
- Part D claims, 2023
- 53%
- generic prescribing
- Likely
- board-certified (heuristic)
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
Han-Ying Chang's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
428 Top 38% higher than 62% of 1,370,886 prescribers
Each bar is a band; taller bars hold more prescribers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source CMS Medicare Part D Prescriber Public Use File · 2023
✓
Board certification likely (heuristic, not verified)
Han-Ying Chang practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 1 hospital affiliation - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Han-Ying Chang?
Quality data not reportedPrimary specialty
Ophthalmology Physician
Medicare Part D claims
428 70% vs specialty avg
Specialty distribution in Massachusetts
How Ophthalmology Physician compares to other specialties among Massachusetts providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Ophthalmology Physician. Verify directly:
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Han-Ying Chang appears in the CMS NPPES registry as an Ophthalmology Physician provider at 243 CHARLES ST, Boston, MA, 02114, with a listed phone of (617) 523-7900. NPI 1184882870 was issued on 05/29/2008.
Medicare Part D records for calendar year 2023 show 428 prescription claims written by this provider, covering 122 Medicare beneficiaries and totaling roughly $62K in drug spend, split 47% brand-name and 53% generic by claim count.
Ophthalmology Physician is a mid-sized specialty nationwide, with 22,082 enrolled providers across 56 states and an average of 1,420 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline.
Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist, always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.
Practice Address
Provider Details
| NPI | 1184882870 |
|---|---|
| Specialty | Ophthalmology Physician |
| Gender | Female |
| NPI Issued | 05/29/2008 |
Hospital and facility affiliations
Facilities where Han-Ying Chang bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.
Massachusetts Eye And Ear Associates, Inc
Boston, MA
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for Han-Ying Chang. Source: openpaymentsdata.cms.gov.
Total received
$14
Largest payer
Ocular Therapeutix, Inc.
Most common payment type
Food and Beverage
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
License & disciplinary context - Massachusetts BORIM 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~38K Massachusetts medical licensees in 2023 - they are NOT specific to Han-Ying Chang. To verify Han-Ying Chang's current license status, search the BORIM public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
80
Total board actions, Massachusetts 2023
Across 78 cases
2.11
Actions per 1,000 licensees
Massachusetts statewide rate
probation
Most common action type
29 cases
BORIM publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the Massachusetts disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Above average
Han-Ying Chang - brand share 47.0%
Ophthalmology Physician average
47% brand-name claims vs 53% generic, on 428 2023 Medicare Part D claims.
The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
428
Total Claims
$62K
Total Drug Cost
122
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 546
- Total Day Supply
- 13,073
- Brand vs Generic
- 47% brand / 53% generic
- Brand Drug Cost
- $57K
- Generic Drug Cost
- $5K
Patient Demographics
- Average Patient Age
- 74.7 years
- Avg HCC Risk Score
- 1.11
- Gender Split
- 58% female / 42% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Han-Ying Chang prescribes most
Top Medicare Part D drugs by claim count, 2023
- Prednisolone Acetate
Prednisolone Acetate
89 claims
- Latanoprost
Latanoprost
62 claims
- Restasis
Restasis
50 claims
- Moxifloxacin
Moxifloxacin
49 claims
- Ketorolac Trometha…
Ketorolac Tromethamine
48 claims
- Neomycin-Polymyxin…
Neomycin-Polymyxin-Dexameth
44 claims
- Brimonidine Tartrate 15
Brimonidine Tartrate
15 claims
- Timolol Maleate 15
Timolol Maleate
15 claims
| Drug | Claims |
|---|---|
| Prednisolone Acetate | 89 |
| Latanoprost | 62 |
| Restasis Cyclosporine | 50 |
| Moxifloxacin Moxifloxacin Hcl | 49 |
| Ketorolac Tromethamine | 48 |
| Neomycin-Polymyxin-Dexameth Neomycin/Polymyxin B/Dexametha | 44 |
| Brimonidine Tartrate | 15 |
| Timolol Maleate | 15 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Ophthalmology Physician Overview
How Han-Ying Chang fits within the Ophthalmology Physician landscape nationally.
22,082
Ophthalmology Physician Providers in US
56
States with Ophthalmology Physician
1,420
Avg Claims per Provider
Han-Ying Chang's 428 claims are below the specialty average of 1,420.
Nearby Ophthalmology Physician Providers in Massachusetts
Other clinicians with the same primary specialty enrolled in Massachusetts, drawn from the same CMS NPPES roster as Chang.
Dr. Mark Abelson
M.D.
Andover, MA
Dr. Inas Aboobakar
M.D.
Boston, MA
Dr. Alessandro Adad Jammal
MD, PHD
Boston, MA
Dr. David Agahigian
M.D.
Springfield, MA
Dr. Kanika Agarwal
MD
Boston, MA
Compare Ophthalmology Physician nationally: see state-by-state distribution →
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the Massachusetts medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Ophthalmology Physician peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
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Frequently Asked Questions
What is Han-Ying Chang's specialty? ▼
Han-Ying Chang specializes in Ophthalmology Physician and practices in Boston, Massachusetts.
How much does Han-Ying Chang prescribe under Medicare Part D? ▼
In 2023, Han-Ying Chang wrote 428 Medicare Part D claims totaling $62K in drug costs for 122 beneficiaries.
Where is Han-Ying Chang located? ▼
Han-Ying Chang is located at 243 CHARLES ST, Boston, MA, 02114. Phone: (617) 523-7900.
What is Han-Ying Chang's NPI number? ▼
Han-Ying Chang's National Provider Identifier (NPI) is 1184882870, issued on 05/29/2008.
Does Han-Ying Chang prescribe more brand-name or generic drugs? ▼
Han-Ying Chang's prescribing is 47% brand-name and 53% generic drugs by claim count, with $57K in brand drug costs.
How many Ophthalmology Physician providers are there in the US? ▼
There are 22,082 Ophthalmology Physician providers across 56 states in the US. The average Ophthalmology Physician provider writes 1,420 Medicare Part D claims per year.
What drugs does Han-Ying Chang prescribe most often? ▼
Based on 2023 Medicare Part D data, Han-Ying Chang's most frequently prescribed drugs include Prednisolone Acetate, Latanoprost, Restasis. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Han-Ying Chang accept Medicare? ▼
Han-Ying Chang appears in CMS Medicare data with 428 Part D claims and 122 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Han-Ying Chang's credentials? ▼
Han-Ying Chang's NPI is 1184882870. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of April 2026 (NPPES) / 2023 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Compiled from official public sources by the PlainDoctor editorial team.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of May 2026.