NPI registry status
Active
2026 NPPES data Retina Specialist (Ophthalmology) Physician NPI 1891130829 MD
Verify on CMS → William Carroll, MD
Retina Specialist (Ophthalmology) Physician in Loganville, Georgia.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 917 in Retina Specialist (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
681
Medicare Part D claims · 174 beneficiaries · Retina Specialist (Ophthalmology) Physician avg: 558
Generic prescribing
73%
generic claims · 27% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
100/100
▲ 17 pts above national avg 83.1 · Exceptional
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
William Carroll, MD reported a CMS MIPS final score of 100/100 - above the 83.1 national average - and filed 681 Medicare Part D claims in 2023.
- 100/100
- MIPS score · +17 vs avg
- 681
- Part D claims, 2023
- 73%
- 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.
William Carroll, MD's MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
100 Top 7% higher than 93% 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 William Carroll, MD sits
This provider among retina specialist (ophthalmology) physician peers
Across the 583 retina specialist (ophthalmology) physician providers who report both Medicare Part D prescribing and a MIPS quality score, William Carroll, MD writes more Part D claims than 75% of them and scores higher on MIPS quality than 58% - placing this provider in the high-volume, high-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 retina specialist (ophthalmology) physician peer from a representative sample of 60; the gold marker is William Carroll, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
William Carroll, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting - 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 William Carroll, MD?
High performer (top quartile)Primary specialty
Retina Specialist (Ophthalmology) Physician
Medicare Part D claims
681 22% vs specialty avg
MIPS final score
100/100 16.9 pts vs avg
Specialty distribution in Georgia
How Retina Specialist (Ophthalmology) Physician compares to other specialties among Georgia providers
Medicare quality performance, MIPS
William Carroll, MD's 2023 MIPS final score plotted against the Retina Specialist (Ophthalmology) Physician national average
- MIPS Final Score
- 100/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Retina Specialist (Ophthalmology) Physician) - 100/100 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).
William Carroll, MD appears in the CMS NPPES registry as a Retina Specialist (Ophthalmology) Physician provider holding MD credentials at 3535 HIGHWAY 81, Loganville, GA, 30052, with a listed phone of (770) 520-8303. NPI 1891130829 was issued on 05/03/2013.
Medicare Part D records for calendar year 2023 show 681 prescription claims written by this provider, covering 174 Medicare beneficiaries and totaling roughly $42K in drug spend, split 27% brand-name and 73% generic by claim count. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 100/100 for the 2023 performance year (Quality 100), compared with the national average of 83.1.
Retina Specialist (Ophthalmology) Physician is a narrow specialty nationwide, with 917 enrolled providers across 48 states and an average of 558 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 | 1891130829 |
|---|---|
| Specialty | Retina Specialist (Ophthalmology) Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 05/03/2013 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
100
Final Score
Avg: 83.1
100
Quality
Reporting: Group practice
Brand vs generic prescribing mix · Above average
William Carroll, MD - brand share 27.0%
Retina Specialist (Ophthalmology) Physician average
27% brand-name claims vs 73% generic, on 681 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.
681
Total Claims
$42K
Total Drug Cost
174
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 993
- Total Day Supply
- 26,189
- Brand vs Generic
- 27% brand / 73% generic
- Brand Drug Cost
- $30K
- Generic Drug Cost
- $12K
- Antibiotic Claims
- 12
Patient Demographics
- Average Patient Age
- 74.2 years
- Avg HCC Risk Score
- 1.61
- Gender Split
- 52% female / 48% male
- Age Distribution
- <65: 17, 65-74: 72, 75-84: 63, 85+: 22
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What William Carroll, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Prednisolone Acetate
Prednisolone Acetate
134 claims
- Brimonidine Tartrate
Brimonidine Tartrate
91 claims
- Ketorolac Trometha…
Ketorolac Tromethamine
86 claims
- Dorzolamide-Timolol
Dorzolamide-Timolol
73 claims
- Erythromycin
Erythromycin
62 claims
- Moxifloxacin 46
Moxifloxacin
46 claims
- Latanoprost 35
Latanoprost
35 claims
- Dorzolamide Hcl 31
Dorzolamide Hcl
31 claims
| Drug | Claims |
|---|---|
| Prednisolone Acetate | 134 |
| Brimonidine Tartrate | 91 |
| Ketorolac Tromethamine | 86 |
| Dorzolamide-Timolol Dorzolamide Hcl/Timolol Maleat | 73 |
| Erythromycin Erythromycin Base | 62 |
| Moxifloxacin Moxifloxacin Hcl | 46 |
| Latanoprost | 35 |
| Dorzolamide Hcl | 31 |
| Timolol Maleate | 26 |
| Rhopressa Netarsudil Mesylate | 14 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Retina Specialist (Ophthalmology) Physician in GA →
All providers in Georgia →
Compare specialties →
Retina Specialist (Ophthalmology) Physician Overview
How William Carroll, MD fits within the Retina Specialist (Ophthalmology) Physician landscape nationally.
917
Retina Specialist (Ophthalmology) Physician Providers in US
48
States with Retina Specialist (Ophthalmology) Physician
558
Avg Claims per Provider
William Carroll, MD's 681 claims are above the specialty average of 558.
Nearby Retina Specialist (Ophthalmology) Physician Providers in Georgia
Other clinicians with the same primary specialty enrolled in Georgia, drawn from the same CMS NPPES roster as Carroll.
Dr. Sruthi Arepalli
M.D.
Atlanta, GA
Dr. Arpan Bachhawat
M.D.
Macon, GA
Dr. David Chin Yee
MD
Atlanta, GA
Dr. Victor Copeland
M.D.
Athens, GA
Dr. Diego Espinosa-Heidmann
M.D.
Augusta, GA
Compare Retina Specialist (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 Georgia medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Retina Specialist (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.
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 Georgia
Frequently Asked Questions
What is William Carroll, MD's specialty? ▼
William Carroll, MD specializes in Retina Specialist (Ophthalmology) Physician and practices in Loganville, Georgia. Credentials: MD.
How much does William Carroll, MD prescribe under Medicare Part D? ▼
In 2023, William Carroll, MD wrote 681 Medicare Part D claims totaling $42K in drug costs for 174 beneficiaries.
What is William Carroll, MD's Medicare quality score? ▼
William Carroll, MD has a CMS MIPS Final Score of 100/100 (Quality: 100). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is William Carroll, MD located? ▼
William Carroll, MD is located at 3535 HIGHWAY 81, Loganville, GA, 30052. Phone: (770) 520-8303.
What is William Carroll, MD's NPI number? ▼
William Carroll, MD's National Provider Identifier (NPI) is 1891130829, issued on 05/03/2013.
Does William Carroll, MD prescribe more brand-name or generic drugs? ▼
William Carroll, MD's prescribing is 27% brand-name and 73% generic drugs by claim count, with $30K in brand drug costs.
How many Retina Specialist (Ophthalmology) Physician providers are there in the US? ▼
There are 917 Retina Specialist (Ophthalmology) Physician providers across 48 states in the US. The average Retina Specialist (Ophthalmology) Physician provider writes 558 Medicare Part D claims per year.
What drugs does William Carroll, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, William Carroll, MD's most frequently prescribed drugs include Prednisolone Acetate, Brimonidine Tartrate, Ketorolac Tromethamine. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does William Carroll, MD accept Medicare? ▼
William Carroll, MD appears in CMS Medicare data with 681 Part D claims and 174 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify William Carroll, MD's credentials? ▼
William Carroll, MD's NPI is 1891130829 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.