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Edit this profileAt a glance
- 401 Kenilworth Dr, Inside Target Optical, Petaluma, CA 94952
About Dr. Tsang
Darwin C. Tsang, O.D. is an optometrist based in Petaluma, CA. Darwin is a 2015 graduate of New England College of Optometry. According to Medicare claims data, Darwin cared for 255 Medicare patients across 260 services. The services billed most often include established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more, photography of the retina, and new patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more. The provider's National Provider Identifier (NPI) is 1619344918.
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
- (707) 775-6022
- Email not available
Is this your home address or personal number? Hide it
Practice Locations
401 KENILWORTH DR INSIDE TARGET OPTICAL
Petaluma, CA 94952
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
260 services · 255 patients · 5 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Photography of the retina | Treatment | 92250 |
67 | As often as other peers in Optometrist |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
92 | More often than most peers in Optometrist |
| New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more | Office visit | 99204 |
54 | More often than most peers in Optometrist |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
34 | As often as other peers in Optometrist |
| Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more | Office visit | 99212 |
13 | 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.
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 Petaluma 8
Same specialty, same city.
Trained at New England College of Optometry 8
Other providers in the same specialty who trained at the same institution.
More connections — 16 related providers in 2 groups
Class of 2015 at New England College of Optometry 8
Providers who graduated from the same medical school in the same year.
Also performs Photography of the retina 8
Providers in CA who bill this service to Medicare most often.
Common questions
What does Darwin C. Tsang specialize in?
Darwin C. Tsang is an optometrist in Petaluma, CA. That is the designation recorded for this NPI in the federal registry.
NPI registry
Where is Darwin C. Tsang located?
Darwin C. Tsang is listed at 401 Kenilworth Dr Inside Target Optical, Petaluma, CA 94952. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Darwin C. Tsang's phone number?
The number on file is (707) 775-6022. Contact the office directly to confirm availability and scheduling.
NPI registry
What is Darwin C. Tsang's NPI number?
Darwin C. Tsang's National Provider Identifier is 1619344918. 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
Where did Darwin C. Tsang train?
Darwin C. Tsang attended New England College of Optometry, graduating in 2015. This comes from the CMS National Downloadable File.
CMS public data
How long has Darwin C. Tsang been practicing?
Darwin C. Tsang has 11 years experience. Calculated from a graduation year of 2015, reported in the CMS National Downloadable File.
CMS public data
What does Darwin C. Tsang do most often?
According to Medicare billing data, Darwin C. Tsang provides treatments such as photography of the retina, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Darwin C. Tsang confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Darwin C. Tsang. If this is you, claiming it is free.
Guide.md
Guide.md listings do not constitute medical advice or an endorsement.