NPI registry status
Active
2026 NPPES data Ophthalmic Plastic and Reconstructive Surgery Physician NPI 1235167537 MD
Verify on CMS → Mark Duffy, MD
Ophthalmic Plastic and Reconstructive Surgery Physician in Green Bay, Wisconsin.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 290 in Ophthalmic Plastic and Reconstructive Surgery 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
808
Medicare Part D claims · 445 beneficiaries · Ophthalmic Plastic and Reconstructive Surgery Physician avg: 624
Generic prescribing
97%
generic claims · 3% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
77.3/100
▼ 6 pts below national avg 83.1 · Above neutral
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
Mark Duffy, MD reported a CMS MIPS final score of 77.3/100 - below the 83.1 national average - and filed 808 Medicare Part D claims in 2023.
- 77.3/100
- MIPS score · -6 vs avg
- 808
- Part D claims, 2023
- 97%
- 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.
Mark Duffy, MD's MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
77 24th percentile higher than 24% 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 Mark Duffy, MD sits
This provider among ophthalmic plastic and reconstructive surgery physician peers
Across the 141 ophthalmic plastic and reconstructive surgery physician providers who report both Medicare Part D prescribing and a MIPS quality score, Mark Duffy, MD writes more Part D claims than 66% of them and scores higher on MIPS quality than 35% - placing this provider in the high-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 ophthalmic plastic and reconstructive surgery physician peer from a representative sample of 60; the gold marker is Mark Duffy, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Mark Duffy, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 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 Mark Duffy, MD?
Below national averagePrimary specialty
Ophthalmic Plastic and Reconstructive Surgery Physician
Medicare Part D claims
808 29% vs specialty avg
MIPS final score
77.3/100 5.8 pts vs avg
Specialty distribution in Wisconsin
How Ophthalmic Plastic and Reconstructive Surgery Physician compares to other specialties among Wisconsin providers
Medicare quality performance, MIPS
Mark Duffy, MD's 2023 MIPS final score plotted against the Ophthalmic Plastic and Reconstructive Surgery Physician national average
- MIPS Final Score
- 77.3/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Ophthalmic Plastic and Reconstructive Surgery Physician) - 77.3/100 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).
Mark Duffy, MD appears in the CMS NPPES registry as an Ophthalmic Plastic and Reconstructive Surgery Physician provider holding MD credentials at 2253 W MASON ST, Green Bay, WI, 54303, with a listed phone of (920) 327-7000. NPI 1235167537 was issued on 06/28/2006.
Medicare Part D records for calendar year 2023 show 808 prescription claims written by this provider, covering 445 Medicare beneficiaries and totaling roughly $8K in drug spend, split 3% brand-name and 97% generic by claim count, with an opioid prescribing rate of 19.1%. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 77.3/100 for the 2023 performance year (Quality 76.2, Cost 48.2), compared with the national average of 83.1.
Ophthalmic Plastic and Reconstructive Surgery Physician is a narrow specialty nationwide, with 290 enrolled providers across 46 states and an average of 624 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 | 1235167537 |
|---|---|
| Specialty | Ophthalmic Plastic and Reconstructive Surgery Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 06/28/2006 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
77.3373
Final Score
Avg: 83.1
76.2218
Quality
48.236
Cost
100
Promoting Interoperability
Reporting: Group practice
Hospital and facility affiliations
Facilities where Mark Duffy, 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.
Baycare Clinic LLP
Green Bay, WI
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Brand vs generic prescribing mix · Generic-heavy
Mark Duffy, MD - brand share 3.0%
Ophthalmic Plastic and Reconstructive Surgery Physician average
3% brand-name claims vs 97% generic, on 808 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.
808
Total Claims
$8K
Total Drug Cost
445
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 814
- Total Day Supply
- 7,747
- Brand vs Generic
- 3% brand / 97% generic
- Brand Drug Cost
- $1K
- Generic Drug Cost
- $7K
- Opioid Claims
- 154 (19.1% rate)
- Antibiotic Claims
- 183
Patient Demographics
- Average Patient Age
- 74.0 years
- Avg HCC Risk Score
- 1.04
- Gender Split
- 60% female / 40% male
- Age Distribution
- <65: 16, 65-74: 234, 75-84: 155, 85+: 40
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Mark Duffy, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Erythromycin
Erythromycin
432 claims
- Cephalexin 153
Cephalexin
153 claims
- Hydrocodone-Acetam… 149
Hydrocodone-Acetaminophen
149 claims
- Azithromycin 27
Azithromycin
27 claims
- Prednisolone Acetate 16
Prednisolone Acetate
16 claims
| Drug | Claims |
|---|---|
| Erythromycin Erythromycin Base | 432 |
| Cephalexin | 153 |
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 149 |
| Azithromycin | 27 |
| Prednisolone Acetate | 16 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Ophthalmic Plastic and Reconstructive Surgery Physician in WI →
All providers in Wisconsin →
Compare specialties →
Ophthalmic Plastic and Reconstructive Surgery Physician Overview
How Mark Duffy, MD fits within the Ophthalmic Plastic and Reconstructive Surgery Physician landscape nationally.
290
Ophthalmic Plastic and Reconstructive Surgery Physician Providers in US
46
States with Ophthalmic Plastic and Reconstructive Surgery Physician
624
Avg Claims per Provider
Mark Duffy, MD's 808 claims are above the specialty average of 624.
Nearby Ophthalmic Plastic and Reconstructive Surgery Physician Providers in Wisconsin
Other clinicians with the same primary specialty enrolled in Wisconsin, drawn from the same CMS NPPES roster as Duffy.
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 Wisconsin medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Ophthalmic Plastic and Reconstructive Surgery 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
Learn more about finding, verifying, and understanding healthcare providers.
How to Find a Doctor
Step-by-step guide to choosing a provider
Verify Credentials
Check NPI, board certification & license status
Medical Specialties Explained
Who treats what and how specialties differ
Understanding Medicare Claims Data
What prescribing data reveals about a provider
In-Network vs Out-of-Network
How insurance networks affect your costs
Telehealth Guide
Virtual care options and coverage in 2026
Explore Wisconsin
Frequently Asked Questions
What is Mark Duffy, MD's specialty? ▼
Mark Duffy, MD specializes in Ophthalmic Plastic and Reconstructive Surgery Physician and practices in Green Bay, Wisconsin. Credentials: MD.
How much does Mark Duffy, MD prescribe under Medicare Part D? ▼
In 2023, Mark Duffy, MD wrote 808 Medicare Part D claims totaling $8K in drug costs for 445 beneficiaries.
What is Mark Duffy, MD's Medicare quality score? ▼
Mark Duffy, MD has a CMS MIPS Final Score of 77.3/100 (Quality: 76.2, Cost: 48.2). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Mark Duffy, MD located? ▼
Mark Duffy, MD is located at 2253 W MASON ST, Green Bay, WI, 54303. Phone: (920) 327-7000.
What is Mark Duffy, MD's NPI number? ▼
Mark Duffy, MD's National Provider Identifier (NPI) is 1235167537, issued on 06/28/2006.
Does Mark Duffy, MD prescribe more brand-name or generic drugs? ▼
Mark Duffy, MD's prescribing is 3% brand-name and 97% generic drugs by claim count, with $1K in brand drug costs.
Does Mark Duffy, MD prescribe opioids? ▼
Yes, Mark Duffy, MD had 154 opioid claims in 2023 with an opioid prescribing rate of 19.1%.
How many Ophthalmic Plastic and Reconstructive Surgery Physician providers are there in the US? ▼
There are 290 Ophthalmic Plastic and Reconstructive Surgery Physician providers across 46 states in the US. The average Ophthalmic Plastic and Reconstructive Surgery Physician provider writes 624 Medicare Part D claims per year.
What drugs does Mark Duffy, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Mark Duffy, MD's most frequently prescribed drugs include Erythromycin, Cephalexin, Hydrocodone-Acetaminophen. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Mark Duffy, MD accept Medicare? ▼
Mark Duffy, MD appears in CMS Medicare data with 808 Part D claims and 445 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Mark Duffy, MD's credentials? ▼
Mark Duffy, MD's NPI is 1235167537 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
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.