Mark H. Williams, O.D.
Optometrist (O.D.) in Redondo Beach, California, trained at Southern California College of Optometry (class of 1980). Their prescriptions cost Medicare Part D more than their services did: $18,409 for 138 claims, against $6,747 paid for services in 2024. Alcon Vision LLC was the largest of 2 companies reporting payments in 2025, $55.80 in all, mostly food and beverage. A record with the same name and state is on the OIG exclusion list; it carries no NPI, so check it before acting.
Overview
| NPI | 1316917842 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | O.D. |
| Sole proprietor | No |
| NPI issued | Jan 26, 2006 |
| Last updated in NPPES | Feb 7, 2013 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Optometrist Primary | 152W00000X | 7603T | CA |
Exclusion screening
Possible match: verify before acting. The OIG list has a record with the same name in California, but that record carries no NPI, so it may be a different person or business.
| Matched by | Name on OIG list | Exclusion type | Excluded since | Location |
|---|---|---|---|---|
| Name + state | Mark Steven Williams · Anesthesiology | 1128b4 | Dec 20, 1999 | Menlo Park, CA |
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | Possible (name) | See above |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Optometry (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 59 |
|---|---|
| Services billed | 117 across 12 procedure codes |
| Paid by Medicare | $6,747 |
Part D prescriptions in 2024
| Prescriptions (claims) | 138 · 205 30-day fills |
|---|---|
| Patients | 39 |
| Total drug cost | $18,409 |
| Generic share | 65% of claims |
Education and affiliations
| Medical school | Southern California College of Optometry |
|---|---|
| Graduation year | 1980 |
| Medicare specialty | Optometry |
Medical group
- Riviera Village Optometry PCRedondo Beach, CA · 2 clinicians
Industry payments (Open Payments)
- 2025$55.80 · 3 payments from 2 companies
- 2024$43.80 · 3 payments from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Alcon Vision LLC | $33.67 | 2 |
| Coopervision Inc. | $22.13 | 1 |
What the 2025 payments were for
- Food and Beverage$55.80 · 3 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 39 optometrists in Redondo Beach · All optometrists in California