Gemma Tok Hyon Ko, M.D.
Gemma Tok Hyon Ko is an Internal Medicine specialist based in Pico Rivera, CA with over 36 years of clinical experience. Offers virtual telehealth visits.
Gemma Tok Hyon Ko, M.D. has been part of the Pico Rivera medical community since 2006 in group practice. A University of Hawaii John a. Burns School of Medicine graduate since 1990, she brings 36+ years of experience. CMS Medicare data shows her patients commonly have hypertension, high cholesterol, and diabetes.
At a glance
- Uses generic medications more than 58% of reporting doctors in California
- Virtual visits available — no app or travel required
Older · 6894dNPPES updated 2007-07-08 · verify NPI on CMS · Verify license at Medical Board of California
What This Doctor Treats Most
Based on Medicare claims data — here's what patients commonly see this doctor for
Based on Medicare data, this doctor primarily manages Hypertension, High Cholesterol, and Diabetes.
High blood pressure — a leading risk factor for heart disease and stroke
US avg: 70.2%↑ More patients than average (+5%) — a focus area for this doctor
Elevated cholesterol or triglycerides that increase heart disease risk
US avg: 70.4%↑ More patients than average (+5%) — a focus area for this doctor
A condition where the body cannot properly regulate blood sugar levels
US avg: 34.5%↑ More patients than average (+17%) — a focus area for this doctor
Joint inflammation causing pain, swelling, and stiffness
US avg: 49.3%↓ Fewer patients than average (-2%) — less common here
Gradual loss of kidney function over time, often linked to diabetes or hypertension
US avg: 29.6%↑ More patients than average (+14%) — a focus area for this doctor
A mood disorder causing persistent sadness and loss of interest in activities
US avg: 31.8%↑ More patients than average (+6%) — a focus area for this doctor
Conditions affecting emotional state, including depression and bipolar disorder
Excessive worry or fear that interferes with daily life
US avg: 34.1%↓ Fewer patients than average (-1%) — less common here
Percentage of this provider's Medicare patients diagnosed with each condition. Source: CMS Utilization Data.
Patient Reviews
No patient reviews yet. If you've seen Gemma Tok Hyon Ko, your feedback helps other patients.
Review PolicyAll feedback is moderated before publishing. We verify reviewer identity where possible and enforce a one-review-per-provider policy. Full guidelines →
Background & Specialty
Education, training, and specialty classification from CMS NPPES and Medicare records.
Graduated medical school · 1990
University of Hawaii John a. Burns School of Medicine
36 years in practice
Senior practitioner
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
Taxonomy: 207R00000X
Education & Training
University of Hawaii John a. Burns School of Medicine (Class of 1990)
Mailing address
Po Box 1699, Whittier, CA 90609-1699
Differs from practice location
Virtual Internal Medicine Care With Gemma Tok Hyon Ko
NPPES records indicate this provider offers telehealth services. Contact the office to confirm availability and scheduling.
Schedule a virtual visit with Gemma Tok Hyon Ko for blood pressure monitoring, cholesterol management, diabetes check-ins — no travel to Pico Rivera required. The office sends a secure video link before your appointment. Most visits take 15–30 minutes.
Frequently Asked Questions
Common questions about Gemma Tok Hyon Ko
Dr. Ko is listed as active in the NPI registry with telehealth listed in Pico Rivera, CA. NPI status alone doesn't confirm open availability — call the office to confirm. Phone: (562) 692-3388.
Sourced from CMS NPPES · OIG LEIE · CMS Medicare Part D · CMS Physician Comparator. See Data Methodology.
Is this your profile?
Verify credentials, update practice details, and manage telehealth.
Medical Disclaimer: NPI Telehealth is a provider directory for informational purposes only. This page does not constitute medical advice, diagnosis, or treatment recommendations. Provider data is sourced from the CMS NPPES federal registry and public Medicare datasets. NPI Telehealth does not verify clinical qualifications beyond federal records. Data may not reflect real-time availability — always contact the provider's office directly to confirm details before seeking care.
Contact Gemma Tok Hyon Ko
Practice Location
4511 Rosemead Blvd, Pico Rivera, CA 90660-2032
Mailing Address
Po Box 1699, Whittier, CA 90609-1699
This is a provider directory. Contact the office directly to schedule appointments.
Related Providers