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Edit this profileAt a glance
- 1310 W Stewart Dr Ste 303, Orange, CA 92868
About Dr. Williams
Mark T. Williams, M.D. is a healthcare provider in Orange, CA specializing in ophthalmology. Mark trained at University of California, San Francisco School of Medicine, graduating in 2017. Mark is also listed as specializing in ophthalmology — retina specialist. According to Medicare claims data, Mark cared for 2,308 Medicare patients across 13,494 services. The services billed most often include injection, faricimab-svoa, 0.1 mg, imaging of retina, and extended exam of the back part of the eye with retinal drawing. This provider record is associated with NPI 1780118802.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (714) 738-4621
- Email not available
Practice Locations
1310 W STEWART DR STE 303
Orange, CA 92868
Conditions Commonly Evaluated or Treated
Within Ophthalmology generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Most searched conditions
Cornea and external eye
Eyelid and tear drainage
Refractive and focusing
- Astigmatism
- Eye misalignment (strabismus)
- Farsightedness
- Lazy eye (amblyopia)
- Nearsightedness
- Presbyopia
Retina and vitreous
Eye injuries
Inflammation, neurologic, and orbit
Retina & vitreous
Procedures & services
Most searched procedures
Examination and imaging
Cataract and lens
Corneal procedures
Eye diagnostics
Eye injuries
Eyelid surgery
Eyelid, tear duct, and muscle
Glaucoma
- Glaucoma drainage-device implantation
- Laser peripheral iridotomy
- Minimally invasive glaucoma surgery
- Selective laser trabeculoplasty
Laser eye surgery
Laser procedures
Laser vision correction
Refractive surgery
Tear duct & Orbit
Procedures Most Often Billed to Medicare
13,494 services · 2,308 patients · 19 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Injection of drug into eye | Procedure | 67028 |
488 | Less often than most peers in Ophthalmology |
| Photocoagulation treatment to prevent detachment of retina | Procedure | 67145 |
82 | More than most peers in Ophthalmology |
| Removal of membrane of retina | Procedure | 67041 |
12 | Less often than most peers in Ophthalmology |
| 2d ultrasound scan of eye tissue and structures | Imaging | 76512 |
64 | More often than most peers in Ophthalmology |
| Imaging of retina | Treatment | 92134 |
1,534 | As often as other peers in Ophthalmology |
| Extended exam of the back part of the eye with retinal drawing | Treatment | 92201 |
1,400 | More than most peers in Ophthalmology |
| Established patient complete exam of visual system | Treatment | 92014 |
128 | Less often than most peers in Ophthalmology |
| Exam of retinal blood vessels using a special camera after injection of a dye | Treatment | 92235 |
104 | More often than most peers in Ophthalmology |
| Exam of the internal drainage system of eye | Treatment | 92020 |
48 | More often than most peers in Ophthalmology |
| Established patient problem focused exam of visual system | Treatment | 92012 |
18 | Less often than most peers in Ophthalmology |
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.
Other eye doctors in Orange 8
Same specialty, same city.
Trained at University of California, San Francisco School of Medicine 8
Other providers in the same specialty who trained at the same institution.
More connections — 16 related providers in 2 groups
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.
Common questions
What is Mark T. Williams's specialty?
Mark T. Williams is an eye doctor in Orange, CA. That is the designation recorded for this NPI in the federal registry, where it is listed as “Ophthalmology”.
NPI registry
Where can I find Mark T. Williams?
Mark T. 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 Mark T. Williams?
The number on file is (714) 738-4621. Contact the office directly to confirm availability and scheduling.
NPI registry
What is Mark T. Williams's NPI number?
Mark T. 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 Mark T. Williams's education?
Mark T. 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 Mark T. Williams been practicing?
Mark T. Williams has 9 years experience. Calculated from a graduation year of 2017, reported in the CMS National Downloadable File.
CMS public data
What is Mark T. Williams known for?
According to Medicare billing data, Mark T. 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 Mark T. Williams confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Mark T. Williams. If this is you, claiming it is free.
Guide.md
Guide.md listings do not constitute medical advice or an endorsement.