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Dr. Carlos H. Zem, MD

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Specializes in: Adult Nephrology

1123 N Main Avenue Suite 120
San Antonio, TX 78212

(210) 226-2001

Dr. Carlos H. Zem, MD is a nephrologist in San Antonio, TX specializing in adult nephrology. Dr. Carlos H. Zem, MD is affiliated with Renal Associates, PA.

Office Locations

1123 N Main Avenue Suite 120
San Antonio, TX 78212

(210) 226-2001

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215 E Quincy Street Suite 610
San Antonio, TX 78215

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543 10th Street
Floresville, TX 78114

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626 Merida Street
San Antonio, TX 78207

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Noteworthy Medicare Patient Procedures Performed by Dr. Carlos H. Zem, MD in 2024

Click on any procedure below to see further details on volume and pricing among Medicare patients.

Top 10%

By Affordability:

dialysis

hemodialysis

In 2024, Dr. Carlos H. Zem, MD had a list price for dialysis, and hemodialysis that was lower than the list prices billed to Medicare by 90% of providers in related specialties within Texas. Actual amounts paid by patients can vary widely depending on a number of factors, including insurance coverage. A lower list price, however, might mean lower fees when paying without insurance.

Top 25%

By Affordability:

chronic care

In 2012, Dr. Carlos H. Zem, MD had a list price for chronic care that was lower than the list prices billed to Medicare by 75% of providers in related specialties within Texas. Actual amounts paid by patients can vary widely depending on a number of factors, including insurance coverage. A lower list price, however, might mean lower fees when paying without insurance.

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. Carlos H. Zem, MD treated as a nephrologist in San Antonio, TX during 2012 were hospital care, inpatient care, dialysis and lab tests.

Volume of procedures performed by Dr. Carlos H. Zem, MD for Medicare patients.

blood draw	100
dialysis	408
doctor visit	341
hemofiltration	46
hospital care	1664
inpatient care	1664
lab tests	194
preventive care	37
vaccines	37

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Carlos H. Zem, MD treated as a nephrologist in San Antonio, TX during 2013 were hospital care, inpatient care, dialysis and lab tests.

Volume of procedures performed by Dr. Carlos H. Zem, MD for Medicare patients.

blood draw	37
dialysis	278
doctor visit	383
hemofiltration	24
hospital care	1386
inpatient care	1386
lab tests	127

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Carlos H. Zem, MD.

**Gender**
Male	245
Female	254

**Ethnicity**
Non-Hispanic White	106
Black	0
Hispanic	345
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	133
From 75 to 84	132
85 and over	67
Less than 65	167

Conditions of Medicare patients treated by Dr. Carlos H. Zem, MD in 2013

Hypertension	75
High Cholesterol	75
Stroke	13
Ischemic Heart Disease	73
Depression	33
Chronic Kidney Disease	75
Asthma	10
Osteoperosis	7
Atrial Fibrilation	14
Heart Failure	62
Chronic Obstructive Pulmonary Disease	26
Diabetes	75
Dementia	25
Cancer	10

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Carlos H. Zem, MD treated as a nephrologist in San Antonio, TX during 2014 were hospital care, inpatient care, dialysis and lab tests.

Volume of procedures performed by Dr. Carlos H. Zem, MD for Medicare patients.

dialysis	332
dialysis access procedures	15
doctor visit	370
hemofiltration	43
hospital care	1191
inpatient care	1191
lab tests	94
vascular procedures	15
X-rays	15

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Carlos H. Zem, MD.

**Gender**
Male	275
Female	263

**Ethnicity**
Non-Hispanic White	119
Black	0
Hispanic	378
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	153
From 75 to 84	118
85 and over	55
Less than 65	212

Conditions of Medicare patients treated by Dr. Carlos H. Zem, MD in 2014

Hypertension	75
High Cholesterol	72
Stroke	12
Ischemic Heart Disease	70
Depression	31
Chronic Kidney Disease	75
Asthma	9
Osteoperosis	7
Atrial Fibrilation	12
Heart Failure	56
Chronic Obstructive Pulmonary Disease	23
Diabetes	75
Dementia	20
Cancer	7

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Carlos H. Zem, MD treated as a nephrologist in San Antonio, TX during 2015 were hospital care, inpatient care, dialysis and lab tests.

Volume of procedures performed by Dr. Carlos H. Zem, MD for Medicare patients.

dialysis	266
dialysis access procedures	23
doctor visit	362
hemofiltration	44
hospital care	1007
inpatient care	1007
lab tests	63
preventive care	11
vaccines	11
vascular procedures	23
X-rays	23

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Carlos H. Zem, MD.

**Gender**
Male	504
Female	482

**Ethnicity**
Non-Hispanic White	200
Black	0
Hispanic	698
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	330
From 75 to 84	214
85 and over	94
Less than 65	348

Conditions of Medicare patients treated by Dr. Carlos H. Zem, MD in 2015

Hypertension	75
High Cholesterol	74
Stroke	14
Ischemic Heart Disease	67
Depression	36
Chronic Kidney Disease	75
Asthma	17
Osteoperosis	9
Atrial Fibrilation	13
Heart Failure	56
Chronic Obstructive Pulmonary Disease	24
Diabetes	75
Dementia	23
Cancer	8

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Carlos H. Zem, MD treated as a nephrologist in San Antonio, TX during 2016 were hospital care, inpatient care, dialysis and lab tests.

Volume of procedures performed by Dr. Carlos H. Zem, MD for Medicare patients.

dialysis	240
doctor visit	346
hemofiltration	40
hospital care	900
inpatient care	900
lab tests	65

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Carlos H. Zem, MD.

**Gender**
Male	254
Female	211

**Ethnicity**
Non-Hispanic White	99
Black	0
Hispanic	318
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	128
From 75 to 84	104
85 and over	58
Less than 65	175

Conditions of Medicare patients treated by Dr. Carlos H. Zem, MD in 2016

Hypertension	75
High Cholesterol	75
Stroke	13
Ischemic Heart Disease	67
Depression	36
Chronic Kidney Disease	75
Asthma	21
Osteoperosis	6
Atrial Fibrilation	15
Heart Failure	54
Chronic Obstructive Pulmonary Disease	20
Diabetes	75
Dementia	27
Cancer	9

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Carlos H. Zem, MD treated as a nephrologist in San Antonio, TX during 2017 were hospital care, inpatient care, dialysis and lab tests.

Volume of procedures performed by Dr. Carlos H. Zem, MD for Medicare patients.

dialysis	229
doctor visit	356
hemofiltration	33
hospital care	1133
inpatient care	1133
lab tests	51

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Carlos H. Zem, MD.

**Gender**
Male	260
Female	242

**Ethnicity**
Non-Hispanic White	132
Black	0
Hispanic	328
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	179
From 75 to 84	99
85 and over	56
Less than 65	168

Conditions of Medicare patients treated by Dr. Carlos H. Zem, MD in 2017

Hypertension	75
High Cholesterol	75
Stroke	14
Ischemic Heart Disease	70
Depression	37
Chronic Kidney Disease	75
Asthma	10
Osteoperosis	6
Atrial Fibrilation	17
Heart Failure	59
Chronic Obstructive Pulmonary Disease	25
Diabetes	75
Dementia	27
Cancer	10

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Carlos H. Zem, MD treated as a nephrologist in San Antonio, TX during 2018 were hospital care, inpatient care, chronic care and dialysis.

Volume of procedures performed by Dr. Carlos H. Zem, MD for Medicare patients.

blood draw	14
chronic care	212
dialysis	180
doctor visit	325
hemofiltration	41
hospital care	1146
inpatient care	1146
lab tests	62

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Carlos H. Zem, MD.

**Gender**
Male	267
Female	248

**Ethnicity**
Non-Hispanic White	113
Black	41
Hispanic	347
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	152
From 75 to 84	108
85 and over	72
Less than 65	183

Conditions of Medicare patients treated by Dr. Carlos H. Zem, MD in 2018

Hypertension	75
High Cholesterol	75
Stroke	13
Ischemic Heart Disease	64
Depression	35
Chronic Kidney Disease	75
Asthma	9
Osteoperosis	7
Atrial Fibrilation	14
Heart Failure	55
Chronic Obstructive Pulmonary Disease	21
Diabetes	75
Dementia	26
Cancer	7

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Carlos H. Zem, MD treated as a nephrologist in San Antonio, TX during 2019 were hospital care, inpatient care, chronic care and dialysis.

Volume of procedures performed by Dr. Carlos H. Zem, MD for Medicare patients.

chronic care	493
dialysis	137
doctor visit	257
hemofiltration	50
hospital care	1081
inpatient care	1081
lab tests	28

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Carlos H. Zem, MD.

**Gender**
Male	238
Female	192

**Ethnicity**
Non-Hispanic White	99
Black	0
Hispanic	285
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	145
From 75 to 84	84
85 and over	59
Less than 65	142

Conditions of Medicare patients treated by Dr. Carlos H. Zem, MD in 2019

Hypertension	75
High Cholesterol	75
Stroke	11
Ischemic Heart Disease	68
Depression	36
Chronic Kidney Disease	75
Asthma	9
Osteoperosis	9
Atrial Fibrilation	16
Heart Failure	59
Chronic Obstructive Pulmonary Disease	21
Diabetes	75
Dementia	25
Cancer	7

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Carlos H. Zem, MD treated as a nephrologist in San Antonio, TX during 2020 were hospital care, inpatient care, chronic care and dialysis.

Volume of procedures performed by Dr. Carlos H. Zem, MD for Medicare patients.

chronic care	505
dialysis	143
doctor visit	307
hemofiltration	72
hospital care	992
inpatient care	992

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Carlos H. Zem, MD.

**Gender**
Male	231
Female	179

**Ethnicity**
Non-Hispanic White	96
Black	0
Hispanic	272
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	130
From 75 to 84	79
85 and over	41
Less than 65	160

Conditions of Medicare patients treated by Dr. Carlos H. Zem, MD in 2020

Hypertension	75
High Cholesterol	75
Stroke	10
Ischemic Heart Disease	69
Depression	38
Chronic Kidney Disease	75
Asthma	8
Osteoperosis	4
Atrial Fibrilation	15
Heart Failure	57
Chronic Obstructive Pulmonary Disease	18
Diabetes	75
Dementia	22
Cancer	7

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Carlos H. Zem, MD treated as a nephrologist in San Antonio, TX during 2021 were hospital care, inpatient care, chronic care and dialysis.

Volume of procedures performed by Dr. Carlos H. Zem, MD for Medicare patients.

chronic care	436
dialysis	158
doctor visit	301
hemofiltration	89
hospital care	1105
inpatient care	1105
lab tests	23

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Carlos H. Zem, MD.

**Gender**
Male	224
Female	184

**Ethnicity**
Non-Hispanic White	102
Black	0
Hispanic	271
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	127
From 75 to 84	92
85 and over	51
Less than 65	138

Conditions of Medicare patients treated by Dr. Carlos H. Zem, MD in 2021

Hypertension	75
High Cholesterol	75
Stroke	15
Ischemic Heart Disease	67
Depression	34
Chronic Kidney Disease	75
Asthma	7
Osteoperosis	7
Atrial Fibrilation	18
Heart Failure	56
Chronic Obstructive Pulmonary Disease	21
Diabetes	75
Dementia	27
Cancer	8

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Carlos H. Zem, MD treated as a nephrologist in San Antonio, TX during 2022 were hospital care, inpatient care, chronic care and dialysis.

Volume of procedures performed by Dr. Carlos H. Zem, MD for Medicare patients.

chronic care	416
dialysis	93
doctor visit	316
hemofiltration	27
hospital care	898
inpatient care	898
lab tests	17

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Carlos H. Zem, MD.

**Gender**
Male	214
Female	163

**Ethnicity**
Non-Hispanic White	106
Black	0
Hispanic	247
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	113
From 75 to 84	116
85 and over	45
Less than 65	103

Conditions of Medicare patients treated by Dr. Carlos H. Zem, MD in 2022

Hypertension	75
High Cholesterol	75
Stroke	20
Ischemic Heart Disease	59
Depression	28
Chronic Kidney Disease	75
Asthma	9
Osteoperosis	8
Atrial Fibrilation	30
Heart Failure	51
Chronic Obstructive Pulmonary Disease	20
Diabetes	73
Dementia	16
Cancer	13

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

The top procedures that Dr. Carlos H. Zem, MD treated as a nephrologist in San Antonio, TX during 2023 were hospital care, inpatient care, chronic care and dialysis.

Volume of procedures performed by Dr. Carlos H. Zem, MD for Medicare patients.

chronic care	328
dialysis	114
doctor visit	247
hemofiltration	38
hospital care	731
inpatient care	731
lab tests	20

2023 Medicare Patient Data

Information about Medicare patients treated by Dr. Carlos H. Zem, MD.

**Gender**
Male	185
Female	161

**Ethnicity**
Non-Hispanic White	109
Black	0
Hispanic	200
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	112
From 75 to 84	105
85 and over	43
Less than 65	86

Conditions of Medicare patients treated by Dr. Carlos H. Zem, MD in 2023

Hypertension	75
High Cholesterol	75
Stroke	20
Ischemic Heart Disease	55
Depression	33
Chronic Kidney Disease	75
Asthma	10
Osteoperosis	10
Atrial Fibrilation	29
Heart Failure	47
Chronic Obstructive Pulmonary Disease	22
Diabetes	72
Dementia	18
Cancer	12

Medicare Procedure and Patient Information

2024 Medicare Procedure Volume

The top procedures that Dr. Carlos H. Zem, MD treated as a nephrologist in San Antonio, TX during 2024 were hospital care, inpatient care, chronic care and dialysis.

Volume of procedures performed by Dr. Carlos H. Zem, MD for Medicare patients.

chronic care	278
dialysis	30
doctor visit	225
hospital care	489
inpatient care	489

2024 Medicare Patient Data

Information about Medicare patients treated by Dr. Carlos H. Zem, MD.

**Gender**
Male	148
Female	128

**Ethnicity**
Non-Hispanic White	80
Black	0
Hispanic	170
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	70
From 75 to 84	94
85 and over	41
Less than 65	71

Conditions of Medicare patients treated by Dr. Carlos H. Zem, MD in 2024

Hypertension	75
High Cholesterol	75
Stroke	17
Ischemic Heart Disease	55
Depression	27
Chronic Kidney Disease	75
Asthma	8
Osteoperosis	12
Atrial Fibrilation	32
Heart Failure	47
Chronic Obstructive Pulmonary Disease	17
Diabetes	71
Dementia	18
Cancer	16

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2024

Volume of procedures performed by Dr. Carlos H. Zem, MD for Medicare patients.

The highest averages for the top procedures that Dr. Carlos H. Zem, MD treated as a nephrologist in San Antonio, TX were hospital care, inpatient care, chronic care and dialysis.

blood draw	50
chronic care	381
dialysis	200
dialysis access procedures	19
doctor visit	318
hemofiltration	45
hospital care	1055
inpatient care	1055
lab tests	67
preventive care	24
vaccines	24
vascular procedures	19
X-rays	19

Average Medicare Patient Data From 2012 - 2024

Information about Medicare patients treated by Dr. Carlos H. Zem, MD.

**Gender**
Female	208
Male	234

**Ethnicity**
Black / African American	3
Asian / Pacific Islander	0
Non-Hispanic White	104
Hispanic	296
Native American / Alaskan Native	0
Other	0

**Age**
85 and over	52
75 to 84	103
Less than 65	150
65 to 74	136

Average of Total of Conditions of Medicare patients treated by Dr. Carlos H. Zem, MD From 2012 - 2024

The highest averages of the most common conditions of Medicare patients that Dr. Carlos H. Zem, MD treated were chronic kidney disease, hypertension, diabetes and high cholesterol.

Hypertension	69
High Cholesterol	68
Stroke	13
Ischemic Heart Disease	60
Depression	31
Chronic Kidney Disease	69
Asthma	9
Osteoporosis	7
Heart Failure	50
Chronic Obstructive Pulmonary Disease	19
Diabetes	68
Atrial Fibrillation	17
Dementia	21
Cancer	8

Education & Training

He has a state license in Texas.

Licensed In: Texas

Ratings & Reviews

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General Payments

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

**Payments by Company**
Fresenius USA Marketing, Inc.	$419 Velphoro $249	2008 Machines $120	Dialyzers $51
Keryx Biopharmaceuticals, Inc.	$413 Auryxia $413
OPKO Pharmaceuticals, LLC	$296 Rayaldee $296
Amgen Inc.	$202 Sensipar $164	Parsabiv $38
Arbor Pharmaceuticals, Inc.	$173 Edarbi $160	BIDIL $13
Other	$1,872 RENVELA $132	ACTHAR $121	ELLIPSYS VASCULAR ACCESS SYSTEM $118	ACTHAR- NEPH $115	Baxter $107	Other $1,279

**Types of Payments**
Food and Beverage	$3,274
Education	$97
Gift	$5

Biography

Dr. Carlos Zem practices adult nephrology in San Antonio, TX and Floresville, TX. He has received the following distinction: Texas Rising Stars.

Select Year:

Dr. Carlos H. Zem, MD

Office Locations

Noteworthy Medicare Patient Procedures Performed by Dr. Carlos H. Zem, MD in 2024

By Affordability:

By Affordability:

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

2013 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Carlos H. Zem, MD in 2013

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

2014 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Carlos H. Zem, MD in 2014

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

2015 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Carlos H. Zem, MD in 2015

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

2016 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Carlos H. Zem, MD in 2016

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

2017 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Carlos H. Zem, MD in 2017

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

2018 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Carlos H. Zem, MD in 2018

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

2019 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Carlos H. Zem, MD in 2019

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

2020 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Carlos H. Zem, MD in 2020

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

2021 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Carlos H. Zem, MD in 2021

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

2022 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Carlos H. Zem, MD in 2022

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

2023 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Carlos H. Zem, MD in 2023

Medicare Procedure and Patient Information

2024 Medicare Procedure Volume

2024 Medicare Patient Data

Conditions of Medicare patients treated by Dr. Carlos H. Zem, MD in 2024

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2024

Average Medicare Patient Data From 2012 - 2024

Average of Total of Conditions of Medicare patients treated by Dr. Carlos H. Zem, MD From 2012 - 2024

Education & Training

Ratings & Reviews

General Payments

Biography

Other Providers in San Antonio, TX