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Edit this profileAt a glance
- 117 N San Mateo Dr, Suite 2, San Mateo, CA 94401
About Dr. Sin
Clarissa Sin, O.D. is an optometrist practicing in San Mateo, CA. Medicare claims data shows Clarissa provided 55 services to 54 patients. The services billed most often include photography of the retina and established patient complete exam of visual system. This provider record is associated with NPI 1619106903.
Factual summary compiled by Guide.md from public records; not written by this provider.
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
- (650) 344-2555
- Email not available
Practice Locations
117 N SAN MATEO DR SUITE 2
San Mateo, CA 94401
Conditions Commonly Evaluated or Treated
Within Optometry 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
Contact lens issues
Cornea conditions
Corneal issues
Eye conditions
Eye discomfort
Eye diseases
Eye infections
Eye inflammation
Eye injuries
Eye irritation
Eye surface issues
Eyelid conditions
Eyelid issues
Pediatric eye conditions
Pupil issues
Tear duct issues
Vision changes
- Blurry Vision
- Color Blindness
- Distorted Vision
- Double Vision
- Eye Floaters and Flashes
- Eye Strain
- Farsightedness
- Halos Around Lights
- Light Sensitivity
- Night Blindness
- Posterior vitreous detachment
- Tunnel Vision
- Visual Migraines
Procedures & services
Most searched procedures
Contact lens exams
- Bifocal or Multifocal Contact Lens Fitting
- Contact Lens Training
- Plano (Non-Prescription) Colored Contact Lens Exam
- Toric Contact Lens Fitting
Dry eye treatments
Examinations
- Comprehensive medical eye examination
- Diabetic Eye Exam
- DMV Vision Test
- Low Vision Assessment
- Pediatric Eye Exam
Eyelid care
Eyelid treatments
General exams
Glasses and eyewear
- Blue Light Glasses Consultation
- Eyeglass Frame Adjustment and Repair
- Prescription Sunglasses Consultation
- Prism Eyeglasses Fitting
Imaging & tests
- Color Vision Testing
- Corneal topography
- Coronary optical coherence tomography
- Eye-pressure measurement
- Pachymetry
- Retinal photography
- Visual Field Test
Imaging and scans
Minor procedures
Specialty lenses
Surgical evaluations
Tear duct procedures
Therapy
Urgent care
Vision correction
Procedures Most Often Billed to Medicare
55 services · 54 patients · 2 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Photography of the retina | Treatment | 92250 |
32 | As often as other peers in Optometrist |
| Established patient complete exam of visual system | Treatment | 92014 |
23 | Less often than most peers in Optometrist |
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.
Other optometrists at this location 1
Same specialty, same street address — most likely the same department or group.
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 optometrists in San Mateo 7
Same specialty, same city.
More connections — 8 related providers in 1 group
Also performs Photography of the retina 8
Providers in CA who bill this service to Medicare most often.
Common questions
What is Clarissa Sin's specialty?
Clarissa Sin is an optometrist in San Mateo, CA. That is the designation recorded for this NPI in the federal registry.
NPI registry
Where can I find Clarissa Sin?
Clarissa Sin is listed at 117 N San Mateo Dr Suite 2, San Mateo, CA 94401. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact Clarissa Sin?
The number on file is (650) 344-2555. Contact the office directly to confirm availability and scheduling.
NPI registry
What is the NPI for Clarissa Sin?
Clarissa Sin's National Provider Identifier is 1619106903. 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
How much experience does Clarissa Sin have?
Clarissa Sin has 17+ years experience. Registered with an NPI since 2009. National Provider Identifiers only began in 2005, so a provider who qualified earlier may have practiced for longer than this.
NPI registry
What is Clarissa Sin known for?
According to Medicare billing data, Clarissa Sin provides treatments such as photography of the retina and established patient complete exam of visual system. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Clarissa Sin's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Clarissa Sin. If this is you, claiming it is free.
Guide.md
Guide.md listings do not constitute medical advice or an endorsement.