Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Dr. Mason Lang, OD

Individual provider Optometrist · NPI 1407337439

Dr. Mason Lang, OD is an Optometry in Union City, California. Qualified in 2014, 12 years ago. Accepts Medicare assignment. Licensed in California and New York.

Years since qualifying
12
Licensed in
CA, NY
In the registry since
2018
Specialties on file
2
What do these letters mean?
OD — Doctor of Optometry
An optometrist: examines eyes, prescribes glasses and contacts, and treats many eye conditions.

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Practice location Address checks out

30600 Dyer St
Union City, CA 94587-1717
Phone: (510) 431-3142
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Optometrist (primary) Taxonomy 152W00000X · Licence 34493 (CA)
Optometrist Taxonomy 152W00000X · Licence 008867 (NY)

Record details

NPI number1407337439
Entity typeIndividual (Type 1)
GenderMale
Credentials OD
Sole proprietorNo
NPI enumeratedAugust 27, 2018
Last updated in NPPESJuly 12, 2025
Certification dateJuly 12, 2025
Mailing address500 Pawnee Pl, Fremont, CA 94539-3306

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyOPTOMETRY
Medical schoolOTHER
Graduated 2014 (12 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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