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

Dr. Otto Liao, MD

Individual provider Allergy & Immunology (Internal Medicine) Physician · NPI 1225042674

Dr. Otto Liao, MD is an Allergy/Immunology in Tustin, California. Qualified in 1997, 29 years ago. Licensed in California.

Years since qualifying
29
Licensed in
CA
In the registry since
2006
Specialties on file
3
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

1076 E 1st St Ste B
Tustin, CA 92780-3852
Phone: (714) 838-2617
Show map & directions

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

Specialties & licences

Allergy & Immunology Physician (primary) Taxonomy 207K00000X · Licence A068959 (CA)
Allergy & Immunology (Internal Medicine) Physician Taxonomy 207RA0201X · Licence A068959 (CA)
Pediatric Allergy/Immunology Physician Taxonomy 2080P0201X · Licence A068959 (CA)

Record details

NPI number1225042674
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 28, 2006
Last updated in NPPESOctober 6, 2020
Certification dateOctober 6, 2020

Medicare enrollment

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

Medicare specialtyALLERGY/IMMUNOLOGY
Also practisesINTERNAL MEDICINE, PEDIATRIC MEDICINE
Medical schoolOTHER
Graduated 1997 (29 years in practice)
Accepts Medicare assignment Not indicated