John Karth, M.D.
NPI 1588862320 · Ophthalmology Physician · Eugene, OR
Enrolled with Medicare as Practitioner - Ophthalmology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Karth, M.D. is a Ophthalmology Physician provider in Eugene, OR (NPI 1588862320).
Provider details
- NPI number
- 1588862320
- Entity type
- Individual
- Primary specialty
- Ophthalmology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- MD27623 (OR)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
18 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
9,537 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Imaging of Retina92134 | 3,705 | $40 |
| Injection of Drug Into Eye67028 | 2,842 | $121 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 1,064 | $89 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 814 | $125 |
| Compounded Drug, Not Otherwise ClassifiedJ7999 | 434 | $92 |
| Established Patient Complete Exam of Visual System92014 | 287 | $125 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 14 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Ofloxacin | 127 | 113 |
| Prednisolone Acetate | 123 | 84 |
| Neomycin/Polymyxin B/Dexamethabrand: Neomycin-Polymyxin-Dexameth | 118 | 104 |
| Ketorolac Tromethamine | 110 | 66 |
| Bromfenac Sodium | 85 | 25 |
| Difluprednate | 73 | 55 |
| Timolol Maleate | 58 | 24 |
| Dorzolamide Hcl/Timolol Maleat |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$569 across 22 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-07-03
- Last updated
- 2017-04-06
Frequently asked questions
- What is John Karth's NPI number?
- John Karth's National Provider Identifier (NPI) is 1588862320, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Karth's specialty?
- John Karth is listed in the NPPES registry with a primary specialty of Ophthalmology Physician (Allopathic & Osteopathic Physicians).
- Where is John Karth located?
- John Karth's practice location on file with NPPES is 1550 Oak St Ste 7, Eugene, OR 97401-7701.
- What is John Karth's phone number?
- The practice phone number listed in the NPPES registry for John Karth is (541) 687-1927.
- Does John Karth accept Medicare?
- John Karth is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Karth's NPI active?
- Yes — John Karth's NPI (1588862320) is active in the NPPES registry as of the last update on 2017-04-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.