NPI registry status
Active
2026 NPPES data Emergency Medicine Physician NPI 1760581672 MD
Verify on CMS → Robert Chang, MD
Emergency Medicine Physician in Greenwich, Connecticut.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 64,463 in Emergency Medicine 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
101
Medicare Part D claims · 59 beneficiaries · Emergency Medicine Physician avg: 352
MIPS score
70.2/100
▼ 13 pts below national avg 83.1 · Mid-tier
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Robert Chang, MD reported a CMS MIPS final score of 70.2/100 - below the 83.1 national average - and filed 101 Medicare Part D claims in 2023.
- 70.2/100
- MIPS score · -13 vs avg
- 101
- Part D claims, 2023
- 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.
Robert Chang, MD's MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
70 8th percentile higher than 8% of 477,587 scored providers
Each bar is a band; taller bars hold more scored providers. 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 Merit-based Incentive Payment System (MIPS) · 2023
Where Robert Chang, MD sits
This provider among emergency medicine physician peers
Across the 14,967 emergency medicine physician providers who report both Medicare Part D prescribing and a MIPS quality score, Robert Chang, MD writes more Part D claims than 33% of them and scores higher on MIPS quality than 5% - placing this provider in the lower-volume, lower-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Part D claim volume vs MIPS quality, by specialty percentile
Each dot is one emergency medicine physician peer from a representative sample of 60; the gold marker is Robert Chang, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Robert Chang, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 3 hospital affiliations - 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 Robert Chang, MD?
Below national averagePrimary specialty
Emergency Medicine Physician
Medicare Part D claims
101 71% vs specialty avg
MIPS final score
70.2/100 12.9 pts vs avg
Specialty distribution in Connecticut
How Emergency Medicine Physician compares to other specialties among Connecticut providers
Medicare quality performance, MIPS
Robert Chang, MD's 2023 MIPS final score plotted against the Emergency Medicine Physician national average
- MIPS Final Score
- 70.2/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Emergency Medicine Physician) - 70.2/100 vs national avg 83.1
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).
Robert Chang, MD appears in the CMS NPPES registry as an Emergency Medicine Physician provider holding MD credentials at 5 PERRYRIDGE RD, Greenwich, CT, 06830, with a listed phone of (203) 863-3637. NPI 1760581672 was issued on 09/21/2006.
Medicare Part D records for calendar year 2023 show 101 prescription claims written by this provider, covering 59 Medicare beneficiaries and totaling roughly $3K in drug spend. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 70.2/100 for the 2023 performance year (Quality 94.4, Cost 28.8), compared with the national average of 83.1.
Emergency Medicine Physician is a high-volume specialty nationwide, with 64,463 enrolled providers across 56 states and an average of 352 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 | 1760581672 |
|---|---|
| Specialty | Emergency Medicine Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 09/21/2006 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
70.2281
Final Score
Avg: 83.1
94.4405
Quality
28.8198
Cost
73
Promoting Interoperability
Reporting: Group practice
Hospital and facility affiliations
Facilities where Robert Chang, MD 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.
According to CMS billing records, Robert Chang, MD is affiliated with 3 Medicare-billing facilities across 3 states.
Greenwich Hospital
Greenwich, CT
Malina Medical Services PC
New York, NY
Mgm Ketamine Services LLC
Oradell, NJ
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
101
Total Claims
$3K
Total Drug Cost
59
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 111
- Total Day Supply
- 1,538
- Generic Drug Cost
- $675
- Antibiotic Claims
- 28
Patient Demographics
- Average Patient Age
- 72.6 years
- Avg HCC Risk Score
- 1.06
- Gender Split
- 59% female / 41% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
| Drug | Claims |
|---|---|
| Prednisone | 17 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Emergency Medicine Physician Overview
How Robert Chang, MD fits within the Emergency Medicine Physician landscape nationally.
64,463
Emergency Medicine Physician Providers in US
56
States with Emergency Medicine Physician
352
Avg Claims per Provider
Robert Chang, MD's 101 claims are below the specialty average of 352.
Nearby Emergency Medicine Physician Providers in Connecticut
Other clinicians with the same primary specialty enrolled in Connecticut, drawn from the same CMS NPPES roster as Chang.
Dr. Carol Abbatiello
D.O.
Hartford, CT
Dr. Lincoln Abbott
MD
Hartford, CT
Dr. Clayton Abeln
MD
New Haven, CT
Dr. Wayne Abrahams
MD
Waterbury, CT
Dr. Theresa Adams
M.D.
New London, CT
Compare Emergency Medicine 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 Connecticut medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Emergency Medicine 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.
Healthcare Guides
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Frequently Asked Questions
What is Robert Chang, MD's specialty? ▼
Robert Chang, MD specializes in Emergency Medicine Physician and practices in Greenwich, Connecticut. Credentials: MD.
How much does Robert Chang, MD prescribe under Medicare Part D? ▼
In 2023, Robert Chang, MD wrote 101 Medicare Part D claims totaling $3K in drug costs for 59 beneficiaries.
What is Robert Chang, MD's Medicare quality score? ▼
Robert Chang, MD has a CMS MIPS Final Score of 70.2/100 (Quality: 94.4, Cost: 28.8). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Robert Chang, MD located? ▼
Robert Chang, MD is located at 5 PERRYRIDGE RD, Greenwich, CT, 06830. Phone: (203) 863-3637.
What is Robert Chang, MD's NPI number? ▼
Robert Chang, MD's National Provider Identifier (NPI) is 1760581672, issued on 09/21/2006.
How many Emergency Medicine Physician providers are there in the US? ▼
There are 64,463 Emergency Medicine Physician providers across 56 states in the US. The average Emergency Medicine Physician provider writes 352 Medicare Part D claims per year.
What drugs does Robert Chang, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Robert Chang, MD's most frequently prescribed drugs include Prednisone. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Robert Chang, MD accept Medicare? ▼
Robert Chang, MD appears in CMS Medicare data with 101 Part D claims and 59 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Robert Chang, MD's credentials? ▼
Robert Chang, MD's NPI is 1760581672 with credentials MD. 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.
- Quality Performance
- CMS Merit-based Incentive Payment System (MIPS) - 2023 performance year.
- 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.