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Frank Chao, O.D.
NPI 1639228448 · Optometrist · Petaluma, CA
Frank Chao, O.D. is a Optometrist provider in Petaluma, CA (NPI 1639228448).
Provider details
- NPI number
- 1639228448
- Entity type
- Individual
- Primary specialty
- OptometristEye and Vision Services Providers
- Credential
- O.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 4489 (CA)
Specialties & taxonomies
Eye and Vision Services Providers
Profile Score
Detailed profile(90/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
3900 Lakeville Hwy
Petaluma, CA 94954-5698
Phone: (707) 765-3501
Approximate (ZIP-level) locationGet directions
Mailing address
Po Box 666
El Verano, CA 95433-0666
Registry dates
- Enumerated
- 2007-01-10
- Last updated
- 2007-07-08
Frequently asked questions
- What is Frank Chao's NPI number?
- Frank Chao's National Provider Identifier (NPI) is 1639228448, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Frank Chao's specialty?
- Frank Chao is listed in the NPPES registry with a primary specialty of Optometrist (Eye and Vision Services Providers).
- Where is Frank Chao located?
- Frank Chao's practice location on file with NPPES is 3900 Lakeville Hwy, Petaluma, CA 94954-5698.
- What is Frank Chao's phone number?
- The practice phone number listed in the NPPES registry for Frank Chao is (707) 765-3501.
- Is Frank Chao's NPI active?
- Yes — Frank Chao's NPI (1639228448) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.