Cai Retina, Sunnyvale: NPI Registry Record and Eye Exam Cost Context
What the registry record says
- NPI number
- 1184560047
- Legal business name
- Louis Cai MD Inc
- Registered trading name
- Cai Retina
- Primary registered specialty
- Ophthalmology, Retina Specialist (207WX0107X)
- Practice location
- 1210 E Arques Ave Ste 210
Sunnyvale, CA 94085-5422 - Phone on the record
- (408) 540-3559
- NPI issued
- April 24, 2026
- Record last updated by the practice
- May 8, 2026
- Registry status
- NPI registry record, active as reported by CMS October 2026
- Metro area
- San Jose-Sunnyvale-Santa Clara, CA
- County
- Santa Clara County
- Location precision
- Street address matched by the US Census geocoder
Reading this record
The practice bills under the legal name Louis Cai MD Inc and registered Cai Retina as its trading name, so an insurance statement may show a name that does not match the sign on the door. The entry was refreshed in May 2026, putting it among the 46 of 260 San Jose-Sunnyvale-Santa Clara records updated in 2024 or later, so the contact details are more likely to be current than most of this metro.
For local context: Sunnyvale holds 15 registered eye care practices in this snapshot, 11 of them optometry and 4 ophthalmology, in ZIP codes including 94085. 14 of them took an NPI before this practice did. The closest is Karin Meng Ms OD and Nicole Janovitch OD Ptr in Sunnyvale, 0.0 miles away.
None of this is a licensing check. CMS issues an NPI so a provider can be identified in billing transactions, and states plainly that issuance does not ensure or validate that the holder is licensed or credentialed. The California boards hold the licensing record, and the practice itself is the only source for what it charges today.
Nearest registered practices
401 other registered eye care practices sit within 25 miles of this address, a radius that does not stop at the metro boundary. Inside the San Jose-Sunnyvale-Santa Clara metro itself there are 260, 14 of them elsewhere in Sunnyvale. The closest 5 are below, measured straight line between registered addresses.
| Practice | City | Registered as | Distance | Phone on record |
|---|---|---|---|---|
| Karin Meng Ms OD and Nicole Janovitch OD Ptr | Sunnyvale | Low vision rehabilitation | 0.0 mi | (408) 245-2020 |
| Refine Dry Eye Center of Silicon Valley, an Optometric Corporation | Sunnyvale | Optometry | 0.2 mi | (408) 217-2887 |
| Miae C. Kim, O.D., Optometric Coporation | Sunnyvale | Optometry | 0.5 mi | (408) 737-2020 |
| C.sharp Optometry | Sunnyvale | Optometry | 0.7 mi | (408) 749-1530 |
| Studio Optics Optometric Group, Inc. | Santa Clara | Ophthalmology | 1.2 mi | (408) 492-1111 |
Distances are straight line between registered practice locations, not driving distance. Records placed at a ZIP centroid rather than a matched street address are excluded from this comparison.
What to expect to pay at an ophthalmology practice like this
The NPI registry holds no prices, so nothing here is a quote from Cai Retina, and ophthalmology practices do not publish fee schedules. Customers report paying $150 to $300 or more at this kind of practice without insurance, which is a reported band rather than a published price. The nearest published figure is $95, the median starting fee across the 1,280 US retail optical stores that print one (30 September 2026), and Medicare pays $149.64 for a comprehensive new-patient exam (CPT 92004). Ask Cai Retina for its self-pay price.
Ophthalmology visits are usually medical rather than routine, which changes who pays: medical insurance and Medicare Part B cover a medically necessary exam, while a routine refraction for glasses is normally not covered. Ask whether the visit will be billed as medical or routine before you book, and compare with the 205 optometry practices on the San Jose-Sunnyvale-Santa Clara page if you only need a prescription.