Karen Diep Toledo, OD
Optometrist · Fontana, CA
Karen Diep Toledo, OD is an optometrist with a practice address in Fontana, California, and NPI 1851942569, issued on Sep 24, 2019. Check the license (California 34380TLG, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Karen Diep Toledo
- Credential
- OD
- Primary taxonomy
- Optometrist 152W00000X
- License number
- 34380TLG CA
Self-reported in NPPES; status is on the state search - Practice location
- 9961 Sierra Ave # 4, Fontana, CA 92335
- Phone
- (909) 427-6984
- Enumerated
- Sep 24, 2019
- Record last updated
- Jan 18, 2024
- Entity
- Type 1 · individual
8 nearest optometrist records → All 8,308 in California → Look up another NPI →
Verify Karen Diep Toledo in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license 34380TLGCheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
9% fewer Medicare Part D claims than the average optometrist in 2024
251 Medicare Part D claims for 143 beneficiaries, against an average of 277 among the 33,128 providers of this specialty who prescribed in Part D. Brand-name drugs were 53% of claims.
Most prescribed
- Cyclosporine68 claims
- Latanoprost46 claims
- Dorzolamide-Timolol22 claims
- Prednisolone Acetate16 claims
- Restasis14 claims
- Azelastine Hcl13 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.
Karen Diep Toledo among 8,308 optometrist records in California
Karen Diep Toledo, OD is one of 8,308 optometrist records with a practice address in California. 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 2019, is newer than 81% of them.
- NPI issued2019 · 81% of these records are older, 16% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileNo · 43% of these records are
- Record last updated2024 · 67% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 152W00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
52 optometrist records list a practice address in Fontana
They are 52 of the 3,012 NPPES records with a practice address in Fontana, and 8,308 optometrist records in California.
All 8,308 in California → Every provider in Fontana → Optometrist nationwide →
The 8 optometrist records with the nearest ZIP codes
- Christopher Albaugh, ODFontana, CA 923351720155567
- Arlene Arcega, ODFontana, CA 923351093882839
- Gary Byers, ODFontana, CA 923351629145479
- Kelly Delange, ODFontana, CA 923351285701029
- Wendy Duncan, ODFontana, CA 923351538152145
- Michael Ferreri, ODFontana, CA 923351245307099
- Frank Grigsby, ODFontana, CA 923351902973746
- Gary Jacobson, ODFontana, CA 923351073680815
Common questions
What is Karen Diep Toledo, OD's NPI number?
Karen Diep Toledo, OD's National Provider Identifier (NPI) is 1851942569, issued on Sep 24, 2019. An NPI identifies a provider in billing; it is not a license.
Where is Karen Diep Toledo, OD located?
The NPPES record lists a practice address at 9961 Sierra Ave # 4, Fontana, CA, 92335. Phone: (909) 427-6984. Providers update this record themselves, so call before visiting.
How can I verify Karen Diep Toledo, OD's license?
NPPES lists California license number 34380TLG, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Karen Diep Toledo, OD prescribe under Medicare Part D?
In 2024, Karen Diep Toledo, OD had 251 Medicare Part D claims for 143 beneficiaries; the average among optometrist prescribers was 277. Part D covers Medicare prescriptions only.
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.