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

Dr. John Stephen Sinclair, PHD

Individual provider Audiologist-Hearing Aid Fitter · NPI 1124201553

Dr. John Stephen Sinclair, PHD is an Audiologist-Hearing Aid Fitter in Northridge, California. Practices as a sole proprietor. Licensed in California.

Licensed in
CA
In the registry since
2007
What do these letters mean?
PHD — Doctor of Philosophy
A research doctorate. In healthcare it usually sits alongside a clinical licence.

See every abbreviation used in this directory →

Practice location Address checks out

18111 Nordhoff St Monterey Hall
Northridge, CA 91330-8288
Phone: (818) 677-2856
Fax: (818) 677-5952
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Audiologist-Hearing Aid Fitter (primary) Taxonomy 237600000X · Licence AU670 (CA)

Record details

NPI number1124201553
Entity typeIndividual (Type 1)
GenderMale
Credentials PHD
Sole proprietorYes
NPI enumeratedDecember 7, 2007
Last updated in NPPESDecember 7, 2007
Mailing address18111 Nordhoff St, Northridge, CA 91330-8288

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