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

William Duan, MD

Individual provider Psychiatric Hospital Unit · NPI 1881334308

William Duan, MD is a Psychiatry in Stockton, California. Qualified in 2022, 4 years ago. Licensed in California.

Years since qualifying
4
Licensed in
CA
In the registry since
2022
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

1800 N California St
Stockton, CA 95204-6019
Phone: (209) 547-5716
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Psychiatry Physician (primary) Taxonomy 2084P0800X · Licence A189333 (CA)
Psychiatric Hospital Unit Taxonomy 273R00000X · Licence A189333 (CA)

Record details

NPI number1881334308
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 31, 2022
Last updated in NPPESJune 24, 2026
Certification dateJune 24, 2026
Mailing address1800 N California St, Stockton, CA 95204-6019

Medicare enrollment

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

Medicare specialtyPSYCHIATRY
Medical schoolOTHER
Graduated 2022 (4 years in practice)
Accepts Medicare assignment Not indicated
Practice locations2 on file with Medicare

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