NPI registry status
Active
2026 NPPES data Retina Specialist (Ophthalmology) Physician NPI 1811253289 M.D.
Verify on CMS → Michael Possin, M.D.
Retina Specialist (Ophthalmology) Physician in Appleton, 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 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
234
Medicare Part D claims · 95 beneficiaries · Retina Specialist (Ophthalmology) Physician avg: 558
Generic prescribing
58%
generic claims · 42% brand-name · higher generic rates reduce patient out-of-pocket costs
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
Michael Possin, M.D. filed 234 Medicare Part D claims in 2023 as a Retina Specialist (Ophthalmology) Physician in Appleton, Wisconsin, prescribing 58% generic.
- 234
- Part D claims, 2023
- 58%
- 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.
Michael Possin, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
234 49th percentile higher than 49% 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)
Michael Possin, M.D. 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 Michael Possin, M.D.?
Quality data not reportedPrimary specialty
Retina Specialist (Ophthalmology) Physician
Medicare Part D claims
234 58% vs specialty avg
Specialty distribution in Wisconsin
How Retina Specialist (Ophthalmology) Physician compares to other specialties among Wisconsin 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 Retina Specialist (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).
Michael Possin, M.D. appears in the CMS NPPES registry as a Retina Specialist (Ophthalmology) Physician provider holding M.D. credentials at 442 N WESTHILL BLVD STE A, Appleton, WI, 54914, with a listed phone of (920) 751-8666. NPI 1811253289 was issued on 04/10/2012.
Medicare Part D records for calendar year 2023 show 234 prescription claims written by this provider, covering 95 Medicare beneficiaries and totaling roughly $11K in drug spend, split 42% brand-name and 58% generic by claim count.
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 | 1811253289 |
|---|---|
| Specialty | Retina Specialist (Ophthalmology) Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 04/10/2012 |
Hospital and facility affiliations
Facilities where Michael Possin, M.D. 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.
Northeast Wisconsin Retina Associates SC
Appleton, 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 · Above average
Michael Possin, M.D. - brand share 42.0%
Retina Specialist (Ophthalmology) Physician average
42% brand-name claims vs 58% generic, on 234 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.
234
Total Claims
$11K
Total Drug Cost
95
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 393
- Total Day Supply
- 11,041
- Brand vs Generic
- 42% brand / 58% generic
- Brand Drug Cost
- $7K
- Generic Drug Cost
- $5K
Patient Demographics
- Average Patient Age
- 73.5 years
- Avg HCC Risk Score
- 1.54
- Gender Split
- 48% female / 52% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Michael Possin, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Prednisolone Acetate
Prednisolone Acetate
71 claims
- Ketorolac Trometha…
Ketorolac Tromethamine
50 claims
- Latanoprost 26
Latanoprost
26 claims
- Dorzolamide-Timolol 21
Dorzolamide-Timolol
21 claims
- Timolol Maleate 19
Timolol Maleate
19 claims
| Drug | Claims |
|---|---|
| Prednisolone Acetate | 71 |
| Ketorolac Tromethamine | 50 |
| Latanoprost | 26 |
| Dorzolamide-Timolol Dorzolamide Hcl/Timolol Maleat | 21 |
| Timolol Maleate | 19 |
* 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 WI →
All providers in Wisconsin →
Compare specialties →
Retina Specialist (Ophthalmology) Physician Overview
How Michael Possin, M.D. 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
Michael Possin, M.D.'s 234 claims are below the specialty average of 558.
Nearby Retina Specialist (Ophthalmology) Physician Providers in Wisconsin
Other clinicians with the same primary specialty enrolled in Wisconsin, drawn from the same CMS NPPES roster as Possin.
Dr. Olufemi Adams
MD
Greenfield, WI
Dr. Jennifer Adeghate
MD, PHD
Milwaukee, WI
Dr. Rajeev Buddi
MD
Neenah, WI
Dr. Roomasa Channa
MBBS
Madison, WI
Dr. Charles Hejny
MD
Neenah, WI
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 Wisconsin 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.
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Frequently Asked Questions
What is Michael Possin, M.D.'s specialty? ▼
Michael Possin, M.D. specializes in Retina Specialist (Ophthalmology) Physician and practices in Appleton, Wisconsin. Credentials: M.D..
How much does Michael Possin, M.D. prescribe under Medicare Part D? ▼
In 2023, Michael Possin, M.D. wrote 234 Medicare Part D claims totaling $11K in drug costs for 95 beneficiaries.
Where is Michael Possin, M.D. located? ▼
Michael Possin, M.D. is located at 442 N WESTHILL BLVD STE A, Appleton, WI, 54914. Phone: (920) 751-8666.
What is Michael Possin, M.D.'s NPI number? ▼
Michael Possin, M.D.'s National Provider Identifier (NPI) is 1811253289, issued on 04/10/2012.
Does Michael Possin, M.D. prescribe more brand-name or generic drugs? ▼
Michael Possin, M.D.'s prescribing is 42% brand-name and 58% generic drugs by claim count, with $7K 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 Michael Possin, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Michael Possin, M.D.'s most frequently prescribed drugs include Prednisolone Acetate, Ketorolac Tromethamine, Latanoprost. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Michael Possin, M.D. accept Medicare? ▼
Michael Possin, M.D. appears in CMS Medicare data with 234 Part D claims and 95 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Michael Possin, M.D.'s credentials? ▼
Michael Possin, M.D.'s NPI is 1811253289 with credentials M.D.. 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.