Dr Mason Lang OD Inc
NPI 1689333502 · Optometrist · Union City, CA
Enrolled with Medicare as Part B Supplier - Clinic/Group Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Dr Mason Lang OD Inc is a Optometrist organization in Union City, CA (NPI 1689333502).
Provider details
- NPI number
- 1689333502
- Entity type
- Organization
- Primary specialty
- OptometristEye and Vision Services Providers
- Organization subpart
- No
- Authorized official
- Mason Lang, Owner(510) 456-5848
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
4 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
2 documented practice locations
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
Other names (DBA / former)
- Doing business as
- Open Eye Optometry
Additional practice locations (1)
- 7150 Camino ArroyoGilroy, CA 95020-7351Phone: (408) 848-1868
Registry dates
- Enumerated
- 2021-12-08
- Last updated
- 2025-07-12
- Certified
- 2025-07-12
Frequently asked questions
- What is Dr Mason Lang OD Inc's NPI number?
- Dr Mason Lang OD Inc's National Provider Identifier (NPI) is 1689333502, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Dr Mason Lang OD Inc?
- Dr Mason Lang OD Inc is classified in the NPPES registry as Optometrist (Eye and Vision Services Providers).
- Where is Dr Mason Lang OD Inc located?
- Dr Mason Lang OD Inc's practice location on file with NPPES is 30600 Dyer St, Union City, CA 94587-1717.
- What is Dr Mason Lang OD Inc's phone number?
- The practice phone number listed in the NPPES registry for Dr Mason Lang OD Inc is (510) 431-3142.
- Does Dr Mason Lang OD Inc accept Medicare?
- Dr Mason Lang OD Inc is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Who is the authorized official for Dr Mason Lang OD Inc?
- The authorized official listed on Dr Mason Lang OD Inc's NPPES record is Mason Lang, Owner. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Dr Mason Lang OD Inc's NPI active?
- Yes — Dr Mason Lang OD Inc's NPI (1689333502) is active in the NPPES registry as of the last update on 2025-07-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.