NPI registry status
Active
2026 NPPES data Optometrist NPI 1285986513 OD
Verify on CMS → Geoffrey Knowles, OD
Optometrist in Dallas, Oregon.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 61,426 in 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
323
Medicare Part D claims · 93 beneficiaries · Optometrist avg: 279
Generic prescribing
71%
generic claims · 29% 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
Geoffrey Knowles, OD filed 323 Medicare Part D claims in 2024 as an Optometrist in Dallas, Oregon, prescribing 71% generic.
- 323
- Part D claims, 2024
- 71%
- generic prescribing
- ≥56th
- 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 Geoffrey Knowles, OD
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 1285986513), first enumerated 10/10/2012.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 323 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- 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 1285986513 · Optometrist
NPI-10 · ENUM-MID · TAX-MEGA · RX-LIGHT · BOOK-LIGHT · PHOTO-ENUM
- NPI-10 1285986513
- ENUM-MID 2012
- TAX-MEGA 61K Optometrist
- RX-LIGHT 323
- BOOK-LIGHT 916 in Oregon
- PHOTO-ENUM Truc Ly Tran, O.D. · 2012
Geoffrey Knowles, OD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
323 ≥ 56th percentile 56% 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
What does the federal data show about Geoffrey Knowles, OD?
Quality data not reportedPrimary specialty
Optometrist
Medicare Part D claims
323 16% vs specialty avg
Specialty distribution in Oregon
How Optometrist compares to other specialties among Oregon 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 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).
Practice Address
Provider Details
| NPI | 1285986513 |
|---|---|
| Specialty | Optometrist |
| Credentials | OD |
| Gender | Male |
| NPI Issued | 10/10/2012 |
Hospital and facility affiliations
Facilities where Geoffrey Knowles, OD 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.
Polk Vision Clinics Inc
Dallas, OR
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
Geoffrey Knowles, OD - brand share 29.0%
Optometrist average
29% brand-name claims vs 71% generic, on 323 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.
323
Total Claims
$9K
Total Drug Cost
93
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 489.9
- Total Day Supply
- 12,986
- Brand vs Generic
- 29% brand / 71% generic
- Brand Drug Cost
- $6K
- Generic Drug Cost
- $3K
Patient Demographics
- Average Patient Age
- 76.2 years
- Avg HCC Risk Score
- 0.94
- Gender Split
- 58% female / 42% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Geoffrey Knowles, OD prescribes most
Top Medicare Part D drugs by claim count, 2024
- Latanoprost
Latanoprost
170 claims
- Brimonidine Tartrate 38
Brimonidine Tartrate
38 claims
- Prednisolone Acetate 22
Prednisolone Acetate
22 claims
- Dorzolamide Hcl 21
Dorzolamide Hcl
21 claims
- Neomycin-Polymyxin… 20
Neomycin-Polymyxin-Dexameth
20 claims
- Timolol Maleate 13
Timolol Maleate
13 claims
| Drug | Claims |
|---|---|
| Latanoprost | 170 |
| Brimonidine Tartrate | 38 |
| Prednisolone Acetate | 22 |
| Dorzolamide Hcl | 21 |
| Neomycin-Polymyxin-Dexameth Neomycin/Polymyxin B/Dexametha | 20 |
| Timolol Maleate | 13 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Optometrist Overview
How Geoffrey Knowles, OD fits within the Optometrist landscape nationally.
61,426
Optometrist Providers in US
56
States with Optometrist
279
Avg Claims per Provider
Geoffrey Knowles, OD's 323 claims are above the specialty average of 279.
Nationwide Optometrist peers with similar MIPS or enrollment year
Two federal-record peer sets for Knowles, both outside Oregon so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2012)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Optometrist Providers in Oregon
Other clinicians with the same primary specialty enrolled in Oregon, drawn from the same CMS NPPES roster as Knowles.
One of 916 Optometrist providers enrolled in Oregon, 5 are shown here.
Dr. James Adamek
OD
Eagle Point, OR
Dr. Brittany Adams
O.D.
Albany, OR
Dr. Makayla Adams
OD
Myrtle Creek, OR
Dr. Shelly Adams
O.D.
White City, OR
Dr. Samuel Adelman
O.D.
Happy Valley, OR
Compare Optometrist nationally: see state-by-state distribution →
Frequently Asked Questions
What is Geoffrey Knowles, OD's specialty? ▼
Geoffrey Knowles, OD specializes in Optometrist and practices in Dallas, Oregon. Credentials: OD.
How much does Geoffrey Knowles, OD prescribe under Medicare Part D? ▼
In 2024, Geoffrey Knowles, OD wrote 323 Medicare Part D claims totaling $9K in drug costs for 93 beneficiaries.
Where is Geoffrey Knowles, OD located? ▼
Geoffrey Knowles, OD is located at 506 MAIN ST, Dallas, OR, 97338. Phone: (503) 851-2547.
What is Geoffrey Knowles, OD's NPI number? ▼
Geoffrey Knowles, OD's National Provider Identifier (NPI) is 1285986513, issued on 10/10/2012.
Does Geoffrey Knowles, OD prescribe more brand-name or generic drugs? ▼
Geoffrey Knowles, OD's prescribing is 29% brand-name and 71% generic drugs by claim count, with $6K in brand drug costs.
How many Optometrist providers are there in the US? ▼
There are 61,426 Optometrist providers across 56 states in the US. The average Optometrist provider writes 279 Medicare Part D claims per year.
What drugs does Geoffrey Knowles, OD prescribe most often? ▼
Based on 2024 Medicare Part D data, Geoffrey Knowles, OD's most frequently prescribed drugs include Latanoprost, Brimonidine Tartrate, Prednisolone Acetate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Geoffrey Knowles, OD accept Medicare? ▼
Geoffrey Knowles, OD appears in CMS Medicare data with 323 Part D claims and 93 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Geoffrey Knowles, OD's credentials? ▼
Geoffrey Knowles, OD's NPI is 1285986513 with credentials OD. 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.