Summary

Dr. Warren Hsiao is an internal medicine physician who earned his medical degree from Tufts University School of Medicine. With 32 years of experience in internal medicine, he provides comprehensive primary care for adult patients. Dr. Hsiao is fluent in both Spanish and English, allowing him to serve diverse communities throughout the Torrance area.

Dr. Hsiao practices at multiple respected healthcare facilities including Harbor UCLA Medical Center, Kaiser Permanente South Bay Medical Center, Torrance Memorial Medical Center, and Providence Little Company of Mary Medical Center, all located in Torrance, California. He focuses on managing common conditions such as high blood pressure and high cholesterol in both adults and younger patients. His practice includes preventive care services like flu vaccinations and other adult immunizations to help patients maintain their health year-round.

Overview based on verified provider data

Quick Facts

  • 32 years of experience
  • speaks Spanish, English
  • Tufts University School Of Medicine
  • 1 specialty
  • 11 areas of expertise
  • 1 board certification
  • 4 hospital affiliations
  • 5 office locations
  • Male

Office Locations

Dr. Warren Hsiao has 5 locations

Kaiser Permanente Torrance Medical Offices

20790 Madrona AveTorrance, CA 90503
Mon8:30 am - 5:30 pm
Tue8:30 am - 5:30 pm
Wed8:30 am - 5:30 pm
Thu8:30 am - 5:30 pm
Fri8:30 am - 5:30 pm
SatClosed
SunClosed

Harbor Ucla Medical Center

1000 W Carson StTorrance, CA 90502

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Dr. Warren Hsiao, MDKarthikeyan Viswanathan, DODr. George Mousa, MDDr. Nima Ghadimi, MD
Internal MedicineInternal MedicineInternal MedicineInternal Medicine
Accepts New Patients Accepts New Patients Accepts New Patients
3.8 
32 Years of Experience 12 Years of Experience 17 Years of Experience 29 Years of Experience
No Virtual Visit Option Virtual Visit Available Virtual Visit Available Virtual Visit Available
Speaks Spanish, English Speaks English, Tamil Speaks English, Spanish
Torrance , CAPalo Alto , CAUpland , CAScottsdale , AZ
Med School: Tufts University School Of Medicine Med School: Bassett Medical Center - Cooperstown, New York Med School: University Of Aleppo Faculty Of Medicine Med School: Univ Iberoamericana Unibe Santo Domingo
Current Profile
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Insurance Plans Accepted by Dr. Warren Hsiao

Be sure to verify insurance information directly with your doctor's office, as it may undergo frequent changes.

Medical Specialties

Dr. Warren Hsiao has the following specialty

Specialty Expertise

Dr. Warren Hsiao has the following 11 areas of expertise

  • Check-up
  • Diabetes
  • Diabetes Complications
  • Heart Diseases
  • Heart Failure
  • Heartburn
  • Immunization
  • Physical
  • Stroke
  • Vaccination
  • Weight Loss

Certifications, License, & Education

32 Years Experience

Dr. Warren Hsiao holds an expired medical license in the state of California.

Medical License

Medical Doctor with an expired medical license in the state of California that expired in 2025.

Education & Training

Medical School

Graduated from Tufts University School Of Medicine in 1994.

NPI Number

Dr. Hsiao's NPI number is 1316095391.

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Frequently Asked Questions

Does Dr. Warren Hsiao accept my insurance?
You can see the insurance plans that Dr. Warren Hsiao accepts on their Vitals profile.
What languages does Dr. Warren Hsiao speak?
Dr. Warren Hsiao speaks Spanish and English.
Where is Dr. Warren Hsiao's office located?
Dr. Warren Hsiao's office is located at 20790 Madrona Ave, Torrance, CA, 90503.
Which hospitals is Dr. Warren Hsiao affiliated with?
Dr. Warren Hsiao is affiliated with Harbor Ucla Medical Center, Kaiser Permanente South Bay Medical Center, Torrance Memorial Medical Center, and Providence Little Company Of Mary Medical Center Torrance.
How can I make an appointment with Dr. Warren Hsiao?
You can find contact information for Dr. Warren Hsiao here on Vitals.

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