NPI registry status
Active
2026 NPPES data Sports Vision Optometrist NPI 1437131927 O.D.
Verify on CMS → William Knapp, O.D.
Sports Vision Optometrist in Upper Sandusky, Ohio.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 40 in Sports Vision Optometrist, 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
264
Medicare Part D claims · 81 beneficiaries · Sports Vision Optometrist avg: 168
Generic prescribing
63%
generic claims · 38% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
William Knapp, O.D. filed 264 Medicare Part D claims in 2023 as a Sports Vision Optometrist in Upper Sandusky, Ohio, prescribing 63% generic.
- 264
- Part D claims, 2023
- 63%
- generic prescribing
- ≥49th
- 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.
William Knapp, O.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
264 ≥ 49th percentile 49% of 1,370,886 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 · 2023
What does the federal data show about William Knapp, O.D.?
Quality data not reportedPrimary specialty
Sports Vision Optometrist
Medicare Part D claims
264 57% vs specialty avg
Specialty distribution in Ohio
How Sports Vision Optometrist compares to other specialties among Ohio 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 Sports Vision Optometrist. 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).
William Knapp, O.D. appears in the CMS NPPES registry as a Sports Vision Optometrist provider holding O.D. credentials at 212 E WYANDOT AVE, Upper Sandusky, OH, 43351, with a listed phone of (419) 294-2421. NPI 1437131927 was issued on 11/18/2005.
Medicare Part D records for calendar year 2023 show 264 prescription claims written by this provider, covering 81 Medicare beneficiaries and totaling roughly $38K in drug spend, split 38% brand-name and 63% generic by claim count.
Sports Vision Optometrist is a narrow specialty nationwide, with 40 enrolled providers across 21 states and an average of 168 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 | 1437131927 |
|---|---|
| Specialty | Sports Vision Optometrist |
| Credentials | O.D. |
| Gender | Male |
| NPI Issued | 11/18/2005 |
License & disciplinary context - Ohio OMB 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~48K Ohio medical licensees in 2023 - they are NOT specific to William Knapp, O.D.. To verify William Knapp, O.D.'s current license status, search the OMB public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
158
Total board actions, Ohio 2023
Across 154 cases
3.29
Actions per 1,000 licensees
Ohio statewide rate
probation
Most common action type
56 cases
OMB publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the Ohio disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Above average
William Knapp, O.D. - brand share 38.0%
Sports Vision Optometrist average
38% brand-name claims vs 63% generic, on 264 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.
264
Total Claims
$38K
Total Drug Cost
81
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 367
- Total Day Supply
- 9,222
- Brand vs Generic
- 38% brand / 63% generic
- Brand Drug Cost
- $34K
- Generic Drug Cost
- $4K
- Antibiotic Claims
- 13
Patient Demographics
- Average Patient Age
- 74.1 years
- Avg HCC Risk Score
- 1.31
- Gender Split
- 58% female / 42% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What William Knapp, O.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Latanoprost
Latanoprost
63 claims
- Timolol Maleate
Timolol Maleate
31 claims
- Tobramycin-Dexamet…
Tobramycin-Dexamethasone
31 claims
- Prednisolone Acetate
Prednisolone Acetate
26 claims
- Lumigan 23
Lumigan
23 claims
- Travoprost 15
Travoprost
15 claims
- Levobunolol Hcl 13
Levobunolol Hcl
13 claims
- Restasis 13
Restasis
13 claims
| Drug | Claims |
|---|---|
| Latanoprost | 63 |
| Timolol Maleate | 31 |
| Tobramycin-Dexamethasone Tobramycin/Dexamethasone | 31 |
| Prednisolone Acetate | 26 |
| Lumigan Bimatoprost | 23 |
| Travoprost | 15 |
| Levobunolol Hcl | 13 |
| Restasis Cyclosporine | 13 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Sports Vision Optometrist Overview
How William Knapp, O.D. fits within the Sports Vision Optometrist landscape nationally.
40
Sports Vision Optometrist Providers in US
21
States with Sports Vision Optometrist
168
Avg Claims per Provider
William Knapp, O.D.'s 264 claims are above the specialty average of 168.
Nearby Sports Vision Optometrist Providers in Ohio
Other clinicians with the same primary specialty enrolled in Ohio, drawn from the same CMS NPPES roster as Knapp.
Compare Sports Vision Optometrist 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 Ohio medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Sports Vision Optometrist 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 William Knapp, O.D.'s specialty? ▼
William Knapp, O.D. specializes in Sports Vision Optometrist and practices in Upper Sandusky, Ohio. Credentials: O.D..
How much does William Knapp, O.D. prescribe under Medicare Part D? ▼
In 2023, William Knapp, O.D. wrote 264 Medicare Part D claims totaling $38K in drug costs for 81 beneficiaries.
Where is William Knapp, O.D. located? ▼
William Knapp, O.D. is located at 212 E WYANDOT AVE, Upper Sandusky, OH, 43351. Phone: (419) 294-2421.
What is William Knapp, O.D.'s NPI number? ▼
William Knapp, O.D.'s National Provider Identifier (NPI) is 1437131927, issued on 11/18/2005.
Does William Knapp, O.D. prescribe more brand-name or generic drugs? ▼
William Knapp, O.D.'s prescribing is 38% brand-name and 63% generic drugs by claim count, with $34K in brand drug costs.
How many Sports Vision Optometrist providers are there in the US? ▼
There are 40 Sports Vision Optometrist providers across 21 states in the US. The average Sports Vision Optometrist provider writes 168 Medicare Part D claims per year.
What drugs does William Knapp, O.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, William Knapp, O.D.'s most frequently prescribed drugs include Latanoprost, Timolol Maleate, Tobramycin-Dexamethasone. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does William Knapp, O.D. accept Medicare? ▼
William Knapp, O.D. appears in CMS Medicare data with 264 Part D claims and 81 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify William Knapp, O.D.'s credentials? ▼
William Knapp, O.D.'s NPI is 1437131927 with credentials O.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
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.