Physician Profile
Unclaimed ProfileAbout WILLIAMS
Mark Tony Williams, M.D. is an ophthalmology — retina specialist practising in Orange, CA. Mark trained at University of California, San Francisco School of Medicine, graduating in 2017. Mark is also listed as specialising in ophthalmology.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Areas of Expertise
Common questions
What is Dr. Williams's specialty?
Dr. Williams is an eye doctor in Orange, CA. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “Ophthalmology — Retina Specialist”.
NPI registry
Where can I find Dr. Williams?
Dr. Williams is listed at 1310 W STEWART DR STE 303, Orange, CA 92868. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact Dr. Williams?
The number on file is (714) 738-4621. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Dr. Williams's NPI number?
Dr. Williams's National Provider Identifier is 1780118802. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
What is Dr. Williams's medical education?
Dr. Williams attended University of California, San Francisco School of Medicine, graduating in 2017. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Williams been practising?
Dr. Williams has 9 years experience. Calculated from a graduation year of 2017, reported in the CMS National Downloadable File.
CMS public data
What is Dr. Williams known for?
According to Medicare billing data, Dr. Williams performs procedures including injection of drug into eye, photocoagulation treatment to prevent detachment of retina and removal of membrane of retina; reads or performs imaging such as 2d ultrasound scan of eye tissue and structures; provides treatments such as imaging of retina and extended exam of the back part of the eye with retinal drawing, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. Williams confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Williams. If this is you, claiming it is free.
Guide.md
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (714) 738-4621
- Email not available
Practice Locations
1310 W STEWART DR STE 303
Orange, CA 92868
Procedures Most Often Billed to Medicare
13,494 services · 2,308 patients · 19 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Injection of drug into eye | Procedure | 67028 |
488 |
| Photocoagulation treatment to prevent detachment of retina | Procedure | 67145 |
82 |
| Removal of membrane of retina | Procedure | 67041 |
12 |
| 2d ultrasound scan of eye tissue and structures | Imaging | 76512 |
64 |
| Imaging of retina | Treatment | 92134 |
1,534 |
| Extended exam of the back part of the eye with retinal drawing | Treatment | 92201 |
1,400 |
| Established patient complete exam of visual system | Treatment | 92014 |
128 |
| Exam of retinal blood vessels using a special camera after injection of a dye | Treatment | 92235 |
104 |
| Exam of the internal drainage system of eye | Treatment | 92020 |
48 |
| Established patient problem focused exam of visual system | Treatment | 92012 |
18 |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Class of 2017 at University of California, San Francisco School of Medicine 8
Providers who graduated from the same medical school in the same year.
Also performs Injection of drug into eye 8
Providers in CA who bill this service to Medicare most often.
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.