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Home > CA Providers > Internists & Internal Medicine Doctors

Dr. Gemma Tok Hyon Ko, MD

Accepting New Patients

(5 Ratings)

Specializes in: Internal Medicine (Adult Medicine)

Brown University, Alpert Medical School

4511 Rosemead Boulevard
Pico Rivera, CA 90660

(562) 692-3388

Dr. Gemma Tok Hyon Ko, MD is an internist in Pico Rivera, CA specializing in internal medicine (adult medicine). She graduated from Brown University, Alpert Medical School. Dr. Gemma Tok Hyon Ko, MD is affiliated with Astrana Health, GEMMA TH KO MD INC and Allied Pacific IPA.

Office Locations

Allied Pacific IPA

4511 Rosemead Boulevard
Pico Rivera, CA 90660

(562) 692-3388

(281) 664-3522

open_in_new

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. Gemma Tok Hyon Ko, MD treated as an internist in Pico Rivera, CA during 2012 were hospital care, inpatient care, blood draw and preventive care.

Volume of procedures performed by Dr. Gemma Tok Hyon Ko, MD for Medicare patients.

blood draw	266
cardiac procedures	12
doctor visit	739
hospital care	306
inpatient care	306
lab tests	160
preventive care	206
ultrasound (sonogram)	24
vaccines	46
vascular procedures	12

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Gemma Tok Hyon Ko, MD treated as an internist in Pico Rivera, CA during 2013 were hospital care, inpatient care, preventive care and lab tests.

Volume of procedures performed by Dr. Gemma Tok Hyon Ko, MD for Medicare patients.

blood draw	241
doctor visit	713
hospital care	309
inpatient care	309
lab tests	269
preventive care	307
vaccines	59

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Gemma Tok Hyon Ko, MD.

**Gender**
Male	57
Female	115

**Ethnicity**
Non-Hispanic White	36
Black	0
Hispanic	117
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	44
From 75 to 84	49
85 and over	45
Less than 65	34

Conditions of Medicare patients treated by Dr. Gemma Tok Hyon Ko, MD in 2013

Hypertension	75
High Cholesterol	74
Stroke	12
Ischemic Heart Disease	52
Depression	34
Chronic Kidney Disease	49
Asthma	12
Osteoperosis	11
Atrial Fibrilation	13
Heart Failure	38
Chronic Obstructive Pulmonary Disease	22
Diabetes	56
Dementia	27
Cancer	8

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Gemma Tok Hyon Ko, MD treated as an internist in Pico Rivera, CA during 2014 were hospital care, inpatient care, blood draw and preventive care.

Volume of procedures performed by Dr. Gemma Tok Hyon Ko, MD for Medicare patients.

blood draw	226
doctor visit	607
hospital care	490
inpatient care	490
lab tests	177
nursing home care	109
preventive care	197
vaccines	42

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Gemma Tok Hyon Ko, MD.

**Gender**
Male	144
Female	177

**Ethnicity**
Non-Hispanic White	72
Black	0
Hispanic	212
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	85
From 75 to 84	94
85 and over	81
Less than 65	61

Conditions of Medicare patients treated by Dr. Gemma Tok Hyon Ko, MD in 2014

Hypertension	75
High Cholesterol	65
Stroke	11
Ischemic Heart Disease	54
Depression	33
Chronic Kidney Disease	47
Asthma	12
Osteoperosis	13
Atrial Fibrilation	13
Heart Failure	37
Chronic Obstructive Pulmonary Disease	19
Diabetes	60
Dementia	30
Cancer	8

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Gemma Tok Hyon Ko, MD treated as an internist in Pico Rivera, CA during 2015 were hospital care, inpatient care, nursing home care and blood draw.

Volume of procedures performed by Dr. Gemma Tok Hyon Ko, MD for Medicare patients.

blood draw	160
doctor visit	472
hospital care	553
inpatient care	553
lab tests	95
nursing home care	284
preventive care	116
vaccines	38

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Gemma Tok Hyon Ko, MD.

**Gender**
Male	336
Female	452

**Ethnicity**
Non-Hispanic White	140
Black	0
Hispanic	528
Asian	78
Other	0
Native American	0

**Age**
From 65 to 74	184
From 75 to 84	216
85 and over	206
Less than 65	182

Conditions of Medicare patients treated by Dr. Gemma Tok Hyon Ko, MD in 2015

Hypertension	75
High Cholesterol	65
Stroke	14
Ischemic Heart Disease	58
Depression	41
Chronic Kidney Disease	53
Asthma	21
Osteoperosis	14
Atrial Fibrilation	13
Heart Failure	43
Chronic Obstructive Pulmonary Disease	29
Diabetes	63
Dementia	36
Cancer	9

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Gemma Tok Hyon Ko, MD treated as an internist in Pico Rivera, CA during 2016 were nursing home care, hospital care, inpatient care and blood draw.

Volume of procedures performed by Dr. Gemma Tok Hyon Ko, MD for Medicare patients.

blood draw	151
doctor visit	442
hospital care	284
inpatient care	284
lab tests	107
nursing home care	363
preventive care	124
vaccines	34

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Gemma Tok Hyon Ko, MD.

**Gender**
Male	110
Female	180

**Ethnicity**
Non-Hispanic White	69
Black	0
Hispanic	182
Asian	24
Other	0
Native American	0

**Age**
From 65 to 74	74
From 75 to 84	74
85 and over	81
Less than 65	61

Conditions of Medicare patients treated by Dr. Gemma Tok Hyon Ko, MD in 2016

Hypertension	75
High Cholesterol	64
Stroke	11
Ischemic Heart Disease	49
Depression	45
Chronic Kidney Disease	58
Asthma	30
Osteoperosis	14
Atrial Fibrilation	13
Heart Failure	34
Chronic Obstructive Pulmonary Disease	28
Diabetes	59
Dementia	38
Cancer	8

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Gemma Tok Hyon Ko, MD treated as an internist in Pico Rivera, CA during 2017 were nursing home care, hospital care, inpatient care and blood draw.

Volume of procedures performed by Dr. Gemma Tok Hyon Ko, MD for Medicare patients.

blood draw	155
doctor visit	464
hospital care	178
inpatient care	178
lab tests	51
nursing home care	457
preventive care	86
vaccines	35

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Gemma Tok Hyon Ko, MD.

**Gender**
Male	69
Female	125

**Ethnicity**
Non-Hispanic White	45
Black	0
Hispanic	113
Asian	17
Other	0
Native American	0

**Age**
From 65 to 74	45
From 75 to 84	50
85 and over	48
Less than 65	51

Conditions of Medicare patients treated by Dr. Gemma Tok Hyon Ko, MD in 2017

Hypertension	75
High Cholesterol	66
Stroke	13
Ischemic Heart Disease	44
Depression	49
Chronic Kidney Disease	61
Asthma	12
Osteoperosis	15
Atrial Fibrilation	9
Heart Failure	27
Chronic Obstructive Pulmonary Disease	29
Diabetes	55
Dementia	38
Cancer	6

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Gemma Tok Hyon Ko, MD treated as an internist in Pico Rivera, CA during 2018 were nursing home care, hospital care, inpatient care and blood draw.

Volume of procedures performed by Dr. Gemma Tok Hyon Ko, MD for Medicare patients.

blood draw	160
doctor visit	434
hospital care	344
inpatient care	344
lab tests	43
nursing home care	347
preventive care	70
vaccines	27

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Gemma Tok Hyon Ko, MD.

**Gender**
Male	69
Female	119

**Ethnicity**
Non-Hispanic White	48
Black	0
Hispanic	113
Asian	14
Other	0
Native American	0

**Age**
From 65 to 74	55
From 75 to 84	52
85 and over	46
Less than 65	35

Conditions of Medicare patients treated by Dr. Gemma Tok Hyon Ko, MD in 2018

Hypertension	75
High Cholesterol	72
Stroke	13
Ischemic Heart Disease	48
Depression	46
Chronic Kidney Disease	63
Asthma	15
Osteoperosis	14
Atrial Fibrilation	12
Heart Failure	39
Chronic Obstructive Pulmonary Disease	29
Diabetes	61
Dementia	42
Cancer	0

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Gemma Tok Hyon Ko, MD treated as an internist in Pico Rivera, CA during 2019 were nursing home care, blood draw, hospital care and inpatient care.

Volume of procedures performed by Dr. Gemma Tok Hyon Ko, MD for Medicare patients.

blood draw	132
doctor visit	449
hospital care	94
inpatient care	94
lab tests	24
nursing home care	190
preventive care	24

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Gemma Tok Hyon Ko, MD.

**Gender**
Male	34
Female	80

**Ethnicity**
Non-Hispanic White	28
Black	0
Hispanic	67
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	31
From 75 to 84	33
85 and over	39
Less than 65	11

Conditions of Medicare patients treated by Dr. Gemma Tok Hyon Ko, MD in 2019

Hypertension	75
High Cholesterol	74
Stroke	15
Ischemic Heart Disease	46
Depression	39
Chronic Kidney Disease	58
Asthma	12
Osteoperosis	18
Atrial Fibrilation	11
Heart Failure	31
Chronic Obstructive Pulmonary Disease	21
Diabetes	57
Dementia	35
Cancer	0

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Gemma Tok Hyon Ko, MD treated as an internist in Pico Rivera, CA during 2020 were blood draw and nursing home care.

Volume of procedures performed by Dr. Gemma Tok Hyon Ko, MD for Medicare patients.

blood draw	117
doctor visit	381
nursing home care	100

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Gemma Tok Hyon Ko, MD.

**Gender**
Male	22
Female	67

**Ethnicity**
Non-Hispanic White	24
Black	0
Hispanic	51
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	0
From 75 to 84	28
85 and over	29
Less than 65	0

Conditions of Medicare patients treated by Dr. Gemma Tok Hyon Ko, MD in 2020

Hypertension	75
High Cholesterol	75
Stroke	0
Ischemic Heart Disease	36
Depression	37
Chronic Kidney Disease	61
Asthma	12
Osteoperosis	15
Atrial Fibrilation	0
Heart Failure	25
Chronic Obstructive Pulmonary Disease	19
Diabetes	52
Dementia	36
Cancer	0

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Gemma Tok Hyon Ko, MD treated as an internist in Pico Rivera, CA during 2021 were blood draw and nursing home care.

Volume of procedures performed by Dr. Gemma Tok Hyon Ko, MD for Medicare patients.

blood draw	102
doctor visit	321
nursing home care	27

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Gemma Tok Hyon Ko, MD.

**Gender**
Male	15
Female	54

**Ethnicity**
Non-Hispanic White	21
Black	0
Hispanic	36
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	22
From 75 to 84	0
85 and over	20
Less than 65	0

Conditions of Medicare patients treated by Dr. Gemma Tok Hyon Ko, MD in 2021

Hypertension	75
High Cholesterol	75
Stroke	0
Ischemic Heart Disease	28
Depression	36
Chronic Kidney Disease	59
Asthma	0
Osteoperosis	0
Atrial Fibrilation	0
Heart Failure	0
Chronic Obstructive Pulmonary Disease	17
Diabetes	46
Dementia	28
Cancer	0

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Gemma Tok Hyon Ko, MD treated as an internist in Pico Rivera, CA during 2022 were blood draw.

Volume of procedures performed by Dr. Gemma Tok Hyon Ko, MD for Medicare patients.

blood draw	76
doctor visit	283

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Gemma Tok Hyon Ko, MD.

**Gender**
Male	11
Female	40

**Ethnicity**
Non-Hispanic White	0
Black	0
Hispanic	28
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	0
From 75 to 84	18
85 and over	14
Less than 65	0

Conditions of Medicare patients treated by Dr. Gemma Tok Hyon Ko, MD in 2022

Hypertension	75
High Cholesterol	75
Stroke	0
Ischemic Heart Disease	22
Depression	39
Chronic Kidney Disease	43
Asthma	0
Osteoperosis	27
Atrial Fibrilation	0
Heart Failure	0
Chronic Obstructive Pulmonary Disease	0
Diabetes	43
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

The top procedures that Dr. Gemma Tok Hyon Ko, MD treated as an internist in Pico Rivera, CA during 2023 were blood draw.

Volume of procedures performed by Dr. Gemma Tok Hyon Ko, MD for Medicare patients.

blood draw	84
doctor visit	302

2023 Medicare Patient Data

Information about Medicare patients treated by Dr. Gemma Tok Hyon Ko, MD.

**Gender**
Male	15
Female	40

**Ethnicity**
Non-Hispanic White	0
Black	0
Hispanic	31
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	0
From 75 to 84	21
85 and over	16
Less than 65	0

Conditions of Medicare patients treated by Dr. Gemma Tok Hyon Ko, MD in 2023

Hypertension	75
High Cholesterol	75
Stroke	0
Ischemic Heart Disease	25
Depression	38
Chronic Kidney Disease	44
Asthma	0
Osteoperosis	24
Atrial Fibrilation	0
Heart Failure	22
Chronic Obstructive Pulmonary Disease	0
Diabetes	51
Dementia	0
Cancer	0

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2023

Volume of procedures performed by Dr. Gemma Tok Hyon Ko, MD for Medicare patients.

The highest averages for the top procedures that Dr. Gemma Tok Hyon Ko, MD treated as an internist in Pico Rivera, CA were hospital care, inpatient care, nursing home care and blood draw.

blood draw	155
cardiac procedures	12
doctor visit	467
hospital care	319
inpatient care	319
lab tests	115
nursing home care	234
preventive care	141
ultrasound (sonogram)	24
vaccines	40
vascular procedures	12

Average Medicare Patient Data From 2012 - 2023

Information about Medicare patients treated by Dr. Gemma Tok Hyon Ko, MD.

**Gender**
Male	73
Female	120

**Ethnicity**
Black / African American	0
Asian / Pacific Islander	11
Non-Hispanic White	40
Hispanic	123
Native American / Alaskan Native	0
Other	0

**Age**
75 to 84	52
85 and over	52
Less than 65	36
65 to 74	45

Average of Total of Conditions of Medicare patients treated by Dr. Gemma Tok Hyon Ko, MD From 2012 - 2023

The highest averages of the most common conditions of Medicare patients that Dr. Gemma Tok Hyon Ko, MD treated were hypertension, high cholesterol, diabetes and chronic kidney disease.

Hypertension	68
High Cholesterol	65
Stroke	7
Ischemic Heart Disease	38
Depression	36
Chronic Kidney Disease	49
Asthma	10
Osteoporosis	13
Heart Failure	24
Chronic Obstructive Pulmonary Disease	17
Diabetes	50
Atrial Fibrillation	7
Cancer	3
Dementia	25

Education & Training

Dr. Gemma Tok Hyon Ko, MD graduated from Brown University, Alpert Medical School. She completed residency at University of Hawaii at Manoa Affiliated Hospitals. She is certified by the Certification: AMERICAN BOARD OF INTERNAL MEDICINE and has a state license in California.

Medical School: Brown University, Alpert Medical School

Residency: University of Hawaii at Manoa Affiliated Hospitals

Board Certification: Certification: AMERICAN BOARD OF INTERNAL MEDICINE

Licensed In: California

Affiliations & Hospitals

Dr. Gemma Tok Hyon Ko, MD is associated with these hospitals and organizations:

Astrana Health

GEMMA TH KO MD INC

Allied Pacific IPA

Ratings & Reviews

Dr. Gemma Tok Hyon Ko, MD has a high overall rating with an average of 4.0 out of 5 stars based on 5 ratings. We collect ratings and reviews of Dr. Gemma Tok Hyon Ko, MD from all over the web to help you find the right in Pico Rivera, CA.

Overall Rating

(5 Ratings)

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General Payments

These charts describe general payments received by Dr. Gemma Tok Hyon Ko, MD. Doctors may receive payments for a number of reasons, including meal compensation, travel compensation, and consulting.

**Payments by Company**
Novo Nordisk Inc	$562 RYBELSUS $150	Victoza $139	Ozempic $138	Tresiba $58	NovoLog Mix 70 30 $22	Other $54
Amgen Inc.	$457 Repatha $379	Prolia $58	$20
AstraZeneca Pharmaceuticals LP	$331 FARXIGA $97	BYDUREON PEN $89	BYDUREON WEEKLY $57	ONGLYZA $21	BYDUREON $18	Other $49
Sunovion Pharmaceuticals Inc.	$222 Lonhala Magnair $154	APTIOM $67
Lilly USA, LLC	$221 TRULICITY $72	JARDIANCE $57	FORTEO $29	MOUNJARO $26	BASAGLAR $21	Other $17
Other	$886 PRALUENT (alirocumab) Injection $118	MK-4305 $100	INVOKANA $90	Kerendia $73	XARELTO $70	Other $436

**Types of Payments**
Food and Beverage	$2,553
Consulting Fee	$100
Education	$26

Biography

Dr. Gemma Ko's average patient rating is 4.0 stars (out of 5). She attended medical school at the University of Hawaii at Manoa, John A. Burns School of Medicine and Brown University, Alpert Medical School. Dr. Ko's medical residency was performed at a hospital affiliated with the University of Hawaii at Manoa. Dr. Ko (or staff) speaks the following foreign languages: Spanish and Korean. She is professionally affiliated with Astrana Health. According to Astrana Health, new patients are welcome to contact Dr. Ko's office in Pico Rivera, CA.