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

Dr. William Edward Callahan Jr., MD

Individual provider Psychiatry Physician · NPI 1538130513

Dr. William Edward Callahan Jr., MD is a Psychiatry Physician in Aliso Viejo, California. Licensed in California. Registered with an NPI since 2006.

Licensed in
CA
In the registry since
2006
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

120 Vantis Ste 540
Aliso Viejo, CA 92656-2676
Phone: (949) 916-5656
Fax: (949) 916-5657
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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 G62750 (CA)

Record details

NPI number1538130513
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJanuary 30, 2006
Last updated in NPPESJuly 8, 2007

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