Mark H. Williams, O.D.
Optometrist · Redondo Beach, CA
Mark H. Williams, O.D. is an optometrist with a practice address in Redondo Beach, California, and NPI 1316917842, issued on Jan 26, 2006. Check the license (California 7603T, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Mark H. Williams
- Credential
- O.D.
- Primary taxonomy
- Optometrist 152W00000X
- License number
- 7603T CA
Self-reported in NPPES; status is on the state search - Practice location
- 239 Avenida Del Norte, Redondo Beach, CA 90277
- Phone
- (310) 540-5545
- Enumerated
- Jan 26, 2006
- Record last updated
- Feb 7, 2013 (not updated in 13 years: call before relying on the address or phone)
- Fax
- (310) 540-5536
- Medicare enrollment
- Enrolled (PECOS I20120229000731); accepts Medicare assignment
- Medical or professional school
- Southern California College Of Optometry, 1980
- Entity
- Type 1 · individual
8 nearest optometrist records → All 8,308 in California → Look up another NPI →
Also registered at 239 Avenida Del Norte
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Lynn Oku, O.D.Optometrist1386614360
Verify Mark H. Williams in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license 7603TCheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
50% fewer Medicare Part D claims than the average optometrist in 2024
138 Medicare Part D claims for 39 beneficiaries, against an average of 277 among the 33,128 providers of this specialty who prescribed in Part D. Brand-name drugs were 35% of claims.
Most prescribed
- Timolol Maleate34 claims
- Travoprost30 claims
- Latanoprost13 claims
- Prednisolone Acetate12 claims
- Xiidra11 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.
Industry payments in 2024: $43.80
3 payments; by number, the most common kind was food and beverage; the largest payer was Alcon Vision LLC. The 34,453 providers of this specialty with any payment received $769.99 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
- Riviera Village Optometry PCRedondo Beach, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark H. Williams among 8,308 optometrist records in California
Mark H. Williams, O.D. 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 2006, is newer than 6% of them.
- NPI issued2006 · 6% of these records are older, 66% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileYes · 43% of these records are
- Graduated1980 · median 2008 among the 3,573 with a school on file
- Record last updated2013 · 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).
31 optometrist records list a practice address in Redondo Beach
They are 31 of the 1,513 NPPES records with a practice address in Redondo Beach, and 8,308 optometrist records in California.
All 8,308 in California → Every provider in Redondo Beach → Optometrist nationwide →
The 8 optometrist records with the nearest ZIP codes
- Kenneth Chu, ODRedondo Beach, CA 902771811033285
- Ann Clark, O.D.Redondo Beach, CA 902771093870925
- Benjamin FouladianRedondo Beach, CA 902771124192620
- Sarah Frassato, O.D.Redondo Beach, CA 902771508017922
- Michael Hansen, ODRedondo Beach, CA 902771669465035
- Sandy Hokama, O.D.Redondo Beach, CA 902771285606319
- Ting Hsu, O.D.Redondo Beach, CA 902771639229461
- Neal Natsumeda, O.D.Redondo Beach, CA 902771598737553
Common questions
What is Mark H. Williams, O.D.'s NPI number?
Mark H. Williams, O.D.'s National Provider Identifier (NPI) is 1316917842, issued on Jan 26, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark H. Williams, O.D. located?
The NPPES record lists a practice address at 239 Avenida Del Norte, Redondo Beach, CA, 90277. Phone: (310) 540-5545. Providers update this record themselves, so call before visiting.
How can I verify Mark H. Williams, O.D.'s license?
NPPES lists California license number 7603T, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Mark H. Williams, O.D. prescribe under Medicare Part D?
In 2024, Mark H. Williams, O.D. had 138 Medicare Part D claims for 39 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.