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

Dr. William Mac Young, MD

Individual provider Psychiatry Physician · NPI 1073537098

Dr. William Mac Young, MD is a Psychiatry Physician in Fountain Valley, California. Practices as a sole proprietor. Licensed in California.

Licensed in
CA
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

11770 Warner Ave Ste 226
Fountain Valley, CA 92708-2663
Phone: (714) 241-8560
Fax: (714) 241-8576
Show map & directions

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

Specialties & licences

Psychiatry Physician (primary) Taxonomy 2084P0800X · Licence C27892 (CA)

Record details

NPI number1073537098
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedJuly 26, 2006
Last updated in NPPESJuly 8, 2007
Mailing address11770 Warner Ave, Suite 226, Fountain Valley, CA 92708-2663

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