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Dr. Geraldine Gan Tan, MD

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Specializes in: Primary Care, Internal Medicine (Adult Medicine) and Hospital Medicine (Hospitalist)

1220 Rossmoor Parkway
Walnut Creek, CA 94595

(925) 947-3393

Dr. Geraldine Gan Tan, MD is a primary care doctor in Walnut Creek, CA specializing in primary care, internal medicine (adult medicine) and hospital medicine (hospitalist). Dr. Geraldine Gan Tan, MD is affiliated with U.S. Department of Veterans Affairs.

Office Locations

1220 Rossmoor Parkway
Walnut Creek, CA 94595

(925) 947-3393

(925) 947-3396

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150 Muir Road Va Northern California (612)
Martinez, CA 94553

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Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. Geraldine Gan Tan, MD treated as a primary care doctor in Walnut Creek, CA during 2012 were hospital care, inpatient care and outpatient care.

Volume of procedures performed by Dr. Geraldine Gan Tan, MD for Medicare patients.

doctor visit	13
hospital care	1668
inpatient care	1637
outpatient care	31

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Geraldine Gan Tan, MD treated as a primary care doctor in Walnut Creek, CA during 2013 were hospital care, inpatient care and outpatient care.

Volume of procedures performed by Dr. Geraldine Gan Tan, MD for Medicare patients.

hospital care	855
inpatient care	842
outpatient care	13

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Geraldine Gan Tan, MD.

**Gender**
Male	206
Female	162

**Ethnicity**
Non-Hispanic White	315
Black	0
Hispanic	32
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	85
From 75 to 84	115
85 and over	124
Less than 65	44

Conditions of Medicare patients treated by Dr. Geraldine Gan Tan, MD in 2013

Hypertension	75
High Cholesterol	70
Stroke	11
Ischemic Heart Disease	59
Depression	38
Chronic Kidney Disease	56
Asthma	13
Osteoperosis	16
Atrial Fibrilation	26
Heart Failure	49
Chronic Obstructive Pulmonary Disease	33
Diabetes	38
Dementia	37
Cancer	18

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Geraldine Gan Tan, MD treated as a primary care doctor in Walnut Creek, CA during 2014 were hospital care, inpatient care and outpatient care.

Volume of procedures performed by Dr. Geraldine Gan Tan, MD for Medicare patients.

hospital care	154
inpatient care	136
outpatient care	18

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Geraldine Gan Tan, MD.

**Gender**
Male	67
Female	76

**Ethnicity**
Non-Hispanic White	114
Black	0
Hispanic	12
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	39
From 75 to 84	44
85 and over	35
Less than 65	25

Conditions of Medicare patients treated by Dr. Geraldine Gan Tan, MD in 2014

Hypertension	75
High Cholesterol	71
Stroke	15
Ischemic Heart Disease	59
Depression	37
Chronic Kidney Disease	58
Asthma	15
Osteoperosis	15
Atrial Fibrilation	27
Heart Failure	40
Chronic Obstructive Pulmonary Disease	31
Diabetes	42
Dementia	31
Cancer	17

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Geraldine Gan Tan, MD treated as a primary care doctor in Walnut Creek, CA during 2015 were hospital care, inpatient care and outpatient care.

Volume of procedures performed by Dr. Geraldine Gan Tan, MD for Medicare patients.

hospital care	1176
inpatient care	1099
outpatient care	77

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Geraldine Gan Tan, MD.

**Gender**
Male	420
Female	462

**Ethnicity**
Non-Hispanic White	630
Black	76
Hispanic	96
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	216
From 75 to 84	248
85 and over	246
Less than 65	172

Conditions of Medicare patients treated by Dr. Geraldine Gan Tan, MD in 2015

Hypertension	75
High Cholesterol	63
Stroke	18
Ischemic Heart Disease	53
Depression	39
Chronic Kidney Disease	66
Asthma	25
Osteoperosis	14
Atrial Fibrilation	27
Heart Failure	44
Chronic Obstructive Pulmonary Disease	32
Diabetes	43
Dementia	26
Cancer	17

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Geraldine Gan Tan, MD treated as a primary care doctor in Walnut Creek, CA during 2016 were hospital care, inpatient care and outpatient care.

Volume of procedures performed by Dr. Geraldine Gan Tan, MD for Medicare patients.

hospital care	1073
inpatient care	1005
outpatient care	68

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Geraldine Gan Tan, MD.

**Gender**
Male	185
Female	221

**Ethnicity**
Non-Hispanic White	257
Black	55
Hispanic	45
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	121
From 75 to 84	95
85 and over	99
Less than 65	91

Conditions of Medicare patients treated by Dr. Geraldine Gan Tan, MD in 2016

Hypertension	75
High Cholesterol	69
Stroke	17
Ischemic Heart Disease	53
Depression	43
Chronic Kidney Disease	73
Asthma	37
Osteoperosis	9
Atrial Fibrilation	28
Heart Failure	49
Chronic Obstructive Pulmonary Disease	32
Diabetes	53
Dementia	28
Cancer	16

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Geraldine Gan Tan, MD treated as a primary care doctor in Walnut Creek, CA during 2017 were hospital care, inpatient care and outpatient care.

Volume of procedures performed by Dr. Geraldine Gan Tan, MD for Medicare patients.

hospital care	561
inpatient care	470
outpatient care	91

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Geraldine Gan Tan, MD.

**Gender**
Male	215
Female	263

**Ethnicity**
Non-Hispanic White	344
Black	37
Hispanic	37
Asian	46
Other	0
Native American	0

**Age**
From 65 to 74	122
From 75 to 84	152
85 and over	127
Less than 65	77

Conditions of Medicare patients treated by Dr. Geraldine Gan Tan, MD in 2017

Hypertension	75
High Cholesterol	62
Stroke	20
Ischemic Heart Disease	51
Depression	43
Chronic Kidney Disease	62
Asthma	17
Osteoperosis	13
Atrial Fibrilation	24
Heart Failure	48
Chronic Obstructive Pulmonary Disease	31
Diabetes	41
Dementia	29
Cancer	19

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Geraldine Gan Tan, MD treated as a primary care doctor in Walnut Creek, CA during 2018 were hospital care, inpatient care and outpatient care.

Volume of procedures performed by Dr. Geraldine Gan Tan, MD for Medicare patients.

hospital care	406
inpatient care	307
outpatient care	99

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Geraldine Gan Tan, MD.

**Gender**
Male	178
Female	232

**Ethnicity**
Non-Hispanic White	323
Black	21
Hispanic	20
Asian	31
Other	0
Native American	0

**Age**
From 65 to 74	104
From 75 to 84	117
85 and over	145
Less than 65	44

Conditions of Medicare patients treated by Dr. Geraldine Gan Tan, MD in 2018

Hypertension	75
High Cholesterol	64
Stroke	15
Ischemic Heart Disease	42
Depression	43
Chronic Kidney Disease	63
Asthma	15
Osteoperosis	20
Atrial Fibrilation	30
Heart Failure	43
Chronic Obstructive Pulmonary Disease	31
Diabetes	37
Dementia	31
Cancer	21

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Geraldine Gan Tan, MD treated as a primary care doctor in Walnut Creek, CA during 2019 were hospital care, inpatient care and outpatient care.

Volume of procedures performed by Dr. Geraldine Gan Tan, MD for Medicare patients.

hospital care	426
inpatient care	328
outpatient care	98

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Geraldine Gan Tan, MD.

**Gender**
Male	176
Female	257

**Ethnicity**
Non-Hispanic White	329
Black	27
Hispanic	27
Asian	35
Other	15
Native American	0

**Age**
From 65 to 74	109
From 75 to 84	139
85 and over	143
Less than 65	42

Conditions of Medicare patients treated by Dr. Geraldine Gan Tan, MD in 2019

Hypertension	75
High Cholesterol	67
Stroke	15
Ischemic Heart Disease	49
Depression	42
Chronic Kidney Disease	64
Asthma	12
Osteoperosis	17
Atrial Fibrilation	25
Heart Failure	39
Chronic Obstructive Pulmonary Disease	25
Diabetes	32
Dementia	35
Cancer	15

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Geraldine Gan Tan, MD treated as a primary care doctor in Walnut Creek, CA during 2020 were hospital care, inpatient care and outpatient care.

Volume of procedures performed by Dr. Geraldine Gan Tan, MD for Medicare patients.

hospital care	372
inpatient care	278
outpatient care	94

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Geraldine Gan Tan, MD.

**Gender**
Male	174
Female	210

**Ethnicity**
Non-Hispanic White	292
Black	21
Hispanic	27
Asian	31
Other	13
Native American	0

**Age**
From 65 to 74	100
From 75 to 84	140
85 and over	112
Less than 65	32

Conditions of Medicare patients treated by Dr. Geraldine Gan Tan, MD in 2020

Hypertension	75
High Cholesterol	72
Stroke	17
Ischemic Heart Disease	53
Depression	40
Chronic Kidney Disease	66
Asthma	16
Osteoperosis	18
Atrial Fibrilation	32
Heart Failure	43
Chronic Obstructive Pulmonary Disease	29
Diabetes	41
Dementia	31
Cancer	18

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Geraldine Gan Tan, MD treated as a primary care doctor in Walnut Creek, CA during 2021 were hospital care, inpatient care and outpatient care.

Volume of procedures performed by Dr. Geraldine Gan Tan, MD for Medicare patients.

hospital care	232
inpatient care	178
outpatient care	54

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Geraldine Gan Tan, MD.

**Gender**
Male	112
Female	130

**Ethnicity**
Non-Hispanic White	181
Black	0
Hispanic	22
Asian	18
Other	0
Native American	0

**Age**
From 65 to 74	70
From 75 to 84	82
85 and over	72
Less than 65	18

Conditions of Medicare patients treated by Dr. Geraldine Gan Tan, MD in 2021

Hypertension	75
High Cholesterol	75
Stroke	21
Ischemic Heart Disease	47
Depression	42
Chronic Kidney Disease	63
Asthma	12
Osteoperosis	20
Atrial Fibrilation	28
Heart Failure	41
Chronic Obstructive Pulmonary Disease	23
Diabetes	39
Dementia	30
Cancer	18

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2021

Volume of procedures performed by Dr. Geraldine Gan Tan, MD for Medicare patients.

The highest averages for the top procedures that Dr. Geraldine Gan Tan, MD treated as a primary care doctor in Walnut Creek, CA were hospital care, inpatient care and outpatient care.

doctor visit	13
hospital care	692
inpatient care	628
outpatient care	64

Average Medicare Patient Data From 2012 - 2021

Information about Medicare patients treated by Dr. Geraldine Gan Tan, MD.

**Gender**
Male	173
Female	201

**Ethnicity**
Black / African American	23
Asian / Pacific Islander	16
Non-Hispanic White	278
Native American / Alaskan Native	0
Hispanic	31
Other	2

**Age**
75 to 84	113
85 and over	110
Less than 65	54
65 to 74	96

Average of Total of Conditions of Medicare patients treated by Dr. Geraldine Gan Tan, MD From 2012 - 2021

The highest averages of the most common conditions of Medicare patients that Dr. Geraldine Gan Tan, MD treated were hypertension, high cholesterol, chronic kidney disease and ischemic heart disease.

Hypertension	67
High Cholesterol	61
Stroke	14
Ischemic Heart Disease	46
Depression	36
Chronic Kidney Disease	57
Asthma	16
Osteoporosis	14
Heart Failure	39
Chronic Obstructive Pulmonary Disease	26
Diabetes	36
Atrial Fibrillation	24
Dementia	27
Cancer	15

Education & Training

She has a state license in California.

Licensed In: California

Ratings & Reviews

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General Payments

These charts describe general payments received by Dr. Geraldine Gan Tan, MD. Doctors may receive payments for a number of reasons, including meal compensation, travel compensation, and consulting.