John William Karth, M.D.
Ophthalmology Physician · Eugene, OR
John William Karth, M.D. is an ophthalmology physician with a practice address in Eugene, Oregon, and NPI 1588862320, issued on Jul 3, 2007. Check the license (Oregon MD27623, as entered in NPPES) on the Oregon Medical Board; the Medicare figures below come from public CMS files.
- Name
- John William Karth
- Credential
- M.D.
- Primary taxonomy
- Ophthalmology Physician 207W00000X
- License number
- MD27623 OR
Self-reported in NPPES; status is on the state search - Practice location
- 1550 Oak St Ste 7, Eugene, OR 97401
- Phone
- (541) 687-1927
- Enumerated
- Jul 3, 2007
- Record last updated
- Apr 6, 2017 (not updated in 9 years: call before relying on the address or phone)
- Fax
- (541) 683-8779
- Medicaid ID
- 274533 OR
- Medicare enrollment
- Enrolled (PECOS I20070822000583); accepts Medicare assignment
- Medical or professional school
- Johns Hopkins University School Of Medicine, 2002
- Entity
- Type 1 · individual
8 nearest ophthalmology physician records → All 322 in Oregon → Look up another NPI →
Also registered at 1550 Oak St Ste 7
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Ernest PuckettOphthalmology Physician1811429236
- Peter Weber, MDOphthalmology Physician1235752908
Verify John William Karth in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersOregon Medical Board
Search for license MD27623Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
38% fewer Medicare Part D claims than the average ophthalmology physician in 2024
945 Medicare Part D claims for 291 beneficiaries, against an average of 1,518 among the 16,459 providers of this specialty who prescribed in Part D. Brand-name drugs were 32% of claims.
Most prescribed
- Ofloxacin127 claims
- Prednisolone Acetate123 claims
- Neomycin-Polymyxin-Dexameth118 claims
- Ketorolac Tromethamine110 claims
- Bromfenac Sodium85 claims
- Difluprednate73 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 92.1 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $568.69
22 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie Inc. The 13,221 providers of this specialty with any payment received $4,535.02 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Oregon Eye Consultants LLCEugene, OR
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John William Karth among 322 ophthalmology physician records in Oregon
John William Karth, M.D. is one of 322 ophthalmology physician records with a practice address in Oregon. 67% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 55% of them.
- NPI issued2007 · 55% of these records are older, 37% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated2002 · median 2007 among the 189 with a school on file
- Record last updated2017 · 63% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207W00000X and a Oregon practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Ophthalmology Physician providers in Oregon
There are 322 ophthalmology physician records in Oregon.
All 322 in Oregon → Every provider in Eugene → Ophthalmology Physician nationwide →
The 8 ophthalmology physician records with the nearest ZIP codes
- Balamurali Ambati, MDEugene, OR 974011750397576
- Robert Champer, MD, PHDEugene, OR 974011861490088
- Scott Cherne, MDEugene, OR 974011033139688
- William Cox, M.D.Eugene, OR 974011992778443
- Robert Davis, MDEugene, OR 974011427056654
- John Deguire, MDEugene, OR 974011487750873
- Keyhan Farkhondepay-Aryah, MDEugene, OR 974011598763716
- John Haines, M.D.Eugene, OR 974011912906496
Common questions
What is John William Karth, M.D.'s NPI number?
John William Karth, M.D.'s National Provider Identifier (NPI) is 1588862320, issued on Jul 3, 2007. An NPI identifies a provider in billing; it is not a license.
Where is John William Karth, M.D. located?
The NPPES record lists a practice address at 1550 Oak St Ste 7, Eugene, OR, 97401. Phone: (541) 687-1927. Providers update this record themselves, so call before visiting.
How can I verify John William Karth, M.D.'s license?
NPPES lists Oregon license number MD27623, as entered by the provider. Search the Oregon Medical Board at https://www.oregon.gov/OMB/Pages/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does John William Karth, M.D. prescribe under Medicare Part D?
In 2024, John William Karth, M.D. had 945 Medicare Part D claims for 291 beneficiaries; the average among ophthalmology physician prescribers was 1,518. Part D covers Medicare prescriptions only.
What is John William Karth, M.D.'s MIPS final score?
The 2023 MIPS final score is 92.1 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.