Michael Thaanum, O.D.
NPI 1285785915 · Optometrist · Hayward, CA
Enrolled with Medicare as Practitioner - Optometry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Michael Thaanum, O.D. is a Optometrist provider in Hayward, CA (NPI 1285785915).
Provider details
- NPI number
- 1285785915
- Entity type
- Individual
- Primary specialty
- OptometristEye and Vision Services Providers
- Credential
- O.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 6571TPA (CA)
Specialties & taxonomies
Eye and Vision Services Providers
Profile Score
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
Mailing address
Registry dates
- Enumerated
- 2007-01-16
- Last updated
- 2009-10-14
Frequently asked questions
- What is Michael Thaanum's NPI number?
- Michael Thaanum's National Provider Identifier (NPI) is 1285785915, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Michael Thaanum's specialty?
- Michael Thaanum is listed in the NPPES registry with a primary specialty of Optometrist (Eye and Vision Services Providers).
- Where is Michael Thaanum located?
- Michael Thaanum's practice location on file with NPPES is 500 Southland Mall, Hayward, CA 94545-2148.
- What is Michael Thaanum's phone number?
- The practice phone number listed in the NPPES registry for Michael Thaanum is (510) 887-2800.
- Does Michael Thaanum accept Medicare?
- Michael Thaanum is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Michael Thaanum's NPI active?
- Yes — Michael Thaanum's NPI (1285785915) is active in the NPPES registry as of the last update on 2009-10-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.