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

William H Sierra, PA

Individual provider Physician Assistant · NPI 1992721229

William H Sierra, PA is a Physician Assistant in West Islip, New York. Licensed in New York. Registered with an NPI since 2006.

Licensed in
NY
In the registry since
2006
What do these letters mean?
PA — Physician Assistant
A licensed clinician who examines, diagnoses and treats under a physician's supervision.

See every abbreviation used in this directory →

Practice location Address checks out

1000 Montauk Hwy
West Islip, NY 11795-4927
Phone: (631) 376-3000
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Physician Assistant (primary) Taxonomy 363A00000X · Licence 002312 (NY)

Record details

NPI number1992721229
Entity typeIndividual (Type 1)
GenderMale
Credentials PA
Sole proprietorNo
NPI enumeratedJuly 13, 2006
Last updated in NPPESMay 29, 2008

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