NPI registry status
Active
2026 NPPES data Retina Specialist (Ophthalmology) Physician NPI 1508181355 MD
Verify on CMS → Peter Karth, MD
Retina Specialist (Ophthalmology) Physician in North Bend, 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 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
418
Medicare Part D claims · 149 beneficiaries · Retina Specialist (Ophthalmology) Physician avg: 558
Generic prescribing
70%
generic claims · 30% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$6.1K
27 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
Peter Karth, MD filed 418 Medicare Part D claims in 2023 as a Retina Specialist (Ophthalmology) Physician in North Bend, Oregon, prescribing 70% generic.
- 418
- Part D claims, 2023
- 70%
- generic prescribing
- $6.1K
- industry payments (Sunshine Act)
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.
Peter Karth, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
418 Top 38% higher than 62% 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
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Board-eligible specialty (heuristic, not verified)
Peter Karth, MD practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Peter Karth, MD?
Quality data not reportedPrimary specialty
Retina Specialist (Ophthalmology) Physician
Medicare Part D claims
418 25% vs specialty avg
Specialty distribution in Oregon
How Retina Specialist (Ophthalmology) Physician 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 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).
Peter Karth, MD appears in the CMS NPPES registry as a Retina Specialist (Ophthalmology) Physician provider holding MD credentials at 1860 VIRGINIA AVE STE 10, North Bend, OR, 97459, with a listed phone of (541) 873-8462. NPI 1508181355 was issued on 04/05/2010.
Medicare Part D records for calendar year 2023 show 418 prescription claims written by this provider, covering 149 Medicare beneficiaries and totaling roughly $22K in drug spend, split 30% brand-name and 70% 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 | 1508181355 |
|---|---|
| Specialty | Retina Specialist (Ophthalmology) Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 04/05/2010 |
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for Peter Karth, MD. Source: openpaymentsdata.cms.gov.
Total received
$6.1K
Largest payer
Alcon Vision LLC
Most common payment type
Food and Beverage
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
Brand vs generic prescribing mix · Above average
Peter Karth, MD - brand share 30.0%
Retina Specialist (Ophthalmology) Physician average
30% brand-name claims vs 70% generic, on 418 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.
418
Total Claims
$22K
Total Drug Cost
149
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 768
- Total Day Supply
- 21,520
- Brand vs Generic
- 30% brand / 70% generic
- Brand Drug Cost
- $17K
- Generic Drug Cost
- $6K
Patient Demographics
- Average Patient Age
- 76.9 years
- Avg HCC Risk Score
- 1.44
- Gender Split
- 68% female / 32% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Peter Karth, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Latanoprost
Latanoprost
105 claims
- Prednisolone Acetate
Prednisolone Acetate
70 claims
- Timolol Maleate
Timolol Maleate
57 claims
- Neomycin-Polymyxin…
Neomycin-Polymyxin-Dexameth
43 claims
- Ketorolac Trometha… 34
Ketorolac Tromethamine
34 claims
- Dorzolamide Hcl 29
Dorzolamide Hcl
29 claims
- Brimonidine Tartrate 17
Brimonidine Tartrate
17 claims
| Drug | Claims |
|---|---|
| Latanoprost | 105 |
| Prednisolone Acetate | 70 |
| Timolol Maleate | 57 |
| Neomycin-Polymyxin-Dexameth Neomycin/Polymyxin B/Dexametha | 43 |
| Ketorolac Tromethamine | 34 |
| Dorzolamide Hcl | 29 |
| Brimonidine Tartrate | 17 |
* 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 OR →
All providers in Oregon →
Compare specialties →
Retina Specialist (Ophthalmology) Physician Overview
How Peter Karth, 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
Peter Karth, MD's 418 claims are below the specialty average of 558.
Nearby Retina Specialist (Ophthalmology) Physician Providers in Oregon
Other clinicians with the same primary specialty enrolled in Oregon, drawn from the same CMS NPPES roster as Karth.
Dr. Justin Etzel
MD
Eugene, OR
Dr. Timothy Gard
MD
Hillsboro, OR
Dr. Andreas Lauer
MD
Portland, OR
Dr. Mi-Kyoung Song
M.D.
Salem, OR
Dr. Paul Tlucek
MD
Portland, OR
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 Oregon 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 Peter Karth, MD's specialty? ▼
Peter Karth, MD specializes in Retina Specialist (Ophthalmology) Physician and practices in North Bend, Oregon. Credentials: MD.
How much does Peter Karth, MD prescribe under Medicare Part D? ▼
In 2023, Peter Karth, MD wrote 418 Medicare Part D claims totaling $22K in drug costs for 149 beneficiaries.
Where is Peter Karth, MD located? ▼
Peter Karth, MD is located at 1860 VIRGINIA AVE STE 10, North Bend, OR, 97459. Phone: (541) 873-8462.
What is Peter Karth, MD's NPI number? ▼
Peter Karth, MD's National Provider Identifier (NPI) is 1508181355, issued on 04/05/2010.
Does Peter Karth, MD prescribe more brand-name or generic drugs? ▼
Peter Karth, MD's prescribing is 30% brand-name and 70% generic drugs by claim count, with $17K 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 Peter Karth, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Peter Karth, MD's most frequently prescribed drugs include Latanoprost, Prednisolone Acetate, Timolol Maleate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Peter Karth, MD accept Medicare? ▼
Peter Karth, MD appears in CMS Medicare data with 418 Part D claims and 149 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Peter Karth, MD's credentials? ▼
Peter Karth, MD's NPI is 1508181355 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.
- 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.