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

Barry Steven Allswang, MD

Individual provider Internal Medicine Physician · NPI 1720016397

Barry Steven Allswang, MD is an Internal Medicine Physician in Los Alamitos, 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.

See every abbreviation used in this directory →

Practice location Address checks out

3801 Katella Ave Ste 330
Los Alamitos, CA 90720-3338
Phone: (562) 594-9546
Show map & directions

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

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence G34791 (CA)

Record details

NPI number1720016397
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 30, 2006
Last updated in NPPESSeptember 7, 2007

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