NPI registry status
Active
2026 NPPES data Retina Specialist (Ophthalmology) Physician NPI 1922013671 MD
Verify on CMS → Charles Hejny, MD
Retina Specialist (Ophthalmology) Physician in Neenah, 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 983 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
115
Medicare Part D claims · 49 beneficiaries · Retina Specialist (Ophthalmology) Physician avg: 593
Generic prescribing
72%
generic claims · 28% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Charles Hejny, MD filed 115 Medicare Part D claims in 2024 as a Retina Specialist (Ophthalmology) Physician in Neenah, Wisconsin, prescribing 72% generic.
- 115
- Part D claims, 2024
- 72%
- generic prescribing
- Likely
- board-certified (heuristic)
- ≥34th
- pct by Part D claim volume (lower-bound band)
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.
Federal trust snapshot
What official records show about Charles Hejny, MD
Federal records show an active NPI with Medicare Part D prescribing activity — verifiable registry data, not a proprietary rating.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1922013671), first enumerated 07/30/2006.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 115 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
Board certification signal
Heuristic suggests board-certified status based on ABMS-eligible specialty taxonomy plus active CMS participation signals — not a direct ABMS verification.
- Reported
Hospital affiliations
1 CMS Care Compare hospital affiliation on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1922013671 · Retina Specialist (Ophthalmology) Physician
NPI-10 · ENUM-LEGACY · TAX-NARROW · RX-LIGHT · BOOK-THIN · PHOTO-ENUM
- NPI-10 1922013671
- ENUM-LEGACY 2006
- TAX-NARROW 983
- RX-LIGHT 115
- BOOK-THIN 13 in Wisconsin
- PHOTO-ENUM Heikki Kostamaa, M.D. · 2006
Charles Hejny, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
115 ≥ 34th percentile 34% of 1,416,883 prescribers are in lower value bands
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.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2024
✓
Board certification likely (heuristic, not verified)
Charles Hejny, MD 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 Charles Hejny, MD?
Quality data not reportedPrimary specialty
Retina Specialist (Ophthalmology) Physician
Medicare Part D claims
115 81% 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).
Practice Address
Provider Details
| NPI | 1922013671 |
|---|---|
| Specialty | Retina Specialist (Ophthalmology) Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 07/30/2006 |
Hospital and facility affiliations
Facilities where Charles Hejny, 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.
Northeast Wisconsin Retina Associates SC
Sheboygan, 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
Charles Hejny, MD - brand share 28.0%
Retina Specialist (Ophthalmology) Physician average
28% brand-name claims vs 72% generic, on 115 2024 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 2024.
115
Total Claims
$4K
Total Drug Cost
49
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 211.833
- Total Day Supply
- 6,093
- Brand vs Generic
- 28% brand / 72% generic
- Brand Drug Cost
- $3K
- Generic Drug Cost
- $2K
Patient Demographics
- Average Patient Age
- 74.3 years
- Avg HCC Risk Score
- 1.03
- Gender Split
- 49% female / 51% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Charles Hejny, MD prescribes most
Top Medicare Part D drugs by claim count, 2024
- Ketorolac Trometha…
Ketorolac Tromethamine
34 claims
- Latanoprost
Latanoprost
22 claims
- Prednisolone Acetate
Prednisolone Acetate
17 claims
- Brimonidine Tartrate
Brimonidine Tartrate
15 claims
- Timolol Maleate
Timolol Maleate
14 claims
| Drug | Claims |
|---|---|
| Ketorolac Tromethamine | 34 |
| Latanoprost | 22 |
| Prednisolone Acetate | 17 |
| Brimonidine Tartrate | 15 |
| Timolol Maleate | 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 WI →
All providers in Wisconsin →
Compare specialties →
Retina Specialist (Ophthalmology) Physician Overview
How Charles Hejny, MD fits within the Retina Specialist (Ophthalmology) Physician landscape nationally.
983
Retina Specialist (Ophthalmology) Physician Providers in US
48
States with Retina Specialist (Ophthalmology) Physician
593
Avg Claims per Provider
Charles Hejny, MD's 115 claims are below the specialty average of 593.
Nationwide Retina Specialist (Ophthalmology) Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Hejny, both outside Wisconsin so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2006)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
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 Hejny.
One of 13 Retina Specialist (Ophthalmology) Physician providers enrolled in Wisconsin, 5 are shown here.
Dr. Olufemi Adams
MD
Greenfield, WI
Dr. Jennifer Adeghate
MD, PHD
Milwaukee, WI
Dr. Joshua Agranat
MD
Greenfield, WI
Dr. Rajeev Buddi
MD
Neenah, WI
Roomasa Channa
MBBS
Madison, WI
Compare Retina Specialist (Ophthalmology) Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Charles Hejny, MD's specialty? ▼
Charles Hejny, MD specializes in Retina Specialist (Ophthalmology) Physician and practices in Neenah, Wisconsin. Credentials: MD.
How much does Charles Hejny, MD prescribe under Medicare Part D? ▼
In 2024, Charles Hejny, MD wrote 115 Medicare Part D claims totaling $4K in drug costs for 49 beneficiaries.
Where is Charles Hejny, MD located? ▼
Charles Hejny, MD is located at 200 THEDA CLARK PLAZA, Neenah, WI, 54956. Phone: (920) 751-8666.
What is Charles Hejny, MD's NPI number? ▼
Charles Hejny, MD's National Provider Identifier (NPI) is 1922013671, issued on 07/30/2006.
Does Charles Hejny, MD prescribe more brand-name or generic drugs? ▼
Charles Hejny, MD's prescribing is 28% brand-name and 72% generic drugs by claim count, with $3K in brand drug costs.
How many Retina Specialist (Ophthalmology) Physician providers are there in the US? ▼
There are 983 Retina Specialist (Ophthalmology) Physician providers across 48 states in the US. The average Retina Specialist (Ophthalmology) Physician provider writes 593 Medicare Part D claims per year.
What drugs does Charles Hejny, MD prescribe most often? ▼
Based on 2024 Medicare Part D data, Charles Hejny, MD's most frequently prescribed drugs include Ketorolac Tromethamine, Latanoprost, Prednisolone Acetate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Charles Hejny, MD accept Medicare? ▼
Charles Hejny, MD appears in CMS Medicare data with 115 Part D claims and 49 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Charles Hejny, MD's credentials? ▼
Charles Hejny, MD's NPI is 1922013671 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 (2024). 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 August 2026 (NPPES) / 2024 (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 August 2026.