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Dr. Mark Theodo Fahlen, MD

(Dr. Mark T. Fahlen, MD)

(5 Ratings)

Specializes in: Adult Nephrology

Albany Medical College (1998)

1400 Florida Avenue Suite 109
Modesto, CA 95350

(209) 544-2910

Dr. Mark Theodo Fahlen, MD is a nephrologist in Modesto, CA specializing in adult nephrology. He graduated from Albany Medical College in 1998 and has 27 years of experience.

Office Locations

1400 Florida Avenue Suite 109
Modesto, CA 95350

(209) 544-2910

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In The News

“Dr. Mark Fahlen isn't afraid to criticize what he calls "corporate medicine" and the pressures exerted on doctors working for large health care systems.”—"Physician faces off against Modesto hospital", Merced Sun-Star, July 2010

Noteworthy Medicare Patient Procedures Performed by Dr. Mark Theodo Fahlen, MD in 2023

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

Top 5%

By Volume:

hemodialysis

By Affordability:

hemodialysis

hospital care

inpatient care

inpatient hospital care

In 2023, among providers in related specialties within California, Dr. Mark Theodo Fahlen, MD performed more hemodialysis procedures for Medicare patients than 95% of them and he also had a list price for hemodialysis, hospital care, inpatient care, and inpatient hospital care (for patient admitted to hospital) that was lower than the list prices billed to Medicare by 95% of them. 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

2013 Medicare Procedure Volume

The top procedures that Dr. Mark Theodo Fahlen, MD treated as a nephrologist in Modesto, CA during 2013 were hospital care, inpatient care and dialysis.

Volume of procedures performed by Dr. Mark Theodo Fahlen, MD for Medicare patients.

dialysis	308
doctor visit	672
hospital care	579
inpatient care	579

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Theodo Fahlen, MD.

**Gender**
Male	228
Female	190

**Ethnicity**
Non-Hispanic White	260
Black	21
Hispanic	99
Asian	24
Other	0
Native American	0

**Age**
From 65 to 74	121
From 75 to 84	109
85 and over	42
Less than 65	146

Conditions of Medicare patients treated by Dr. Mark Theodo Fahlen, MD in 2013

The most common conditions of Medicare patients that Dr. Mark Theodo Fahlen, MD treated during 2013 were chronic kidney disease, hypertension, high cholesterol and diabetes.

Hypertension	75
High Cholesterol	62
Stroke	8
Ischemic Heart Disease	44
Depression	19
Chronic Kidney Disease	75
Asthma	7
Osteoperosis	6
Atrial Fibrilation	14
Heart Failure	43
Chronic Obstructive Pulmonary Disease	22
Diabetes	57
Dementia	13
Cancer	9

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Mark Theodo Fahlen, MD treated as a nephrologist in Modesto, CA during 2014 were hospital care, inpatient care and dialysis.

Volume of procedures performed by Dr. Mark Theodo Fahlen, MD for Medicare patients.

dialysis	280
doctor visit	672
hospital care	533
inpatient care	533

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Theodo Fahlen, MD.

**Gender**
Male	219
Female	185

**Ethnicity**
Non-Hispanic White	235
Black	24
Hispanic	112
Asian	0
Other	0
Native American	0

**Age**
From 65 to 74	127
From 75 to 84	99
85 and over	42
Less than 65	136

Conditions of Medicare patients treated by Dr. Mark Theodo Fahlen, MD in 2014

The most common conditions of Medicare patients that Dr. Mark Theodo Fahlen, MD treated during 2014 were chronic kidney disease, hypertension, high cholesterol and diabetes.

Hypertension	75
High Cholesterol	58
Stroke	9
Ischemic Heart Disease	49
Depression	22
Chronic Kidney Disease	75
Asthma	9
Osteoperosis	7
Atrial Fibrilation	14
Heart Failure	44
Chronic Obstructive Pulmonary Disease	23
Diabetes	55
Dementia	11
Cancer	7

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Mark Theodo Fahlen, MD treated as a nephrologist in Modesto, CA during 2015 were hospital care, inpatient care and dialysis.

Volume of procedures performed by Dr. Mark Theodo Fahlen, MD for Medicare patients.

dialysis	304
doctor visit	669
hospital care	328
inpatient care	328

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Theodo Fahlen, MD.

**Gender**
Male	434
Female	362

**Ethnicity**
Non-Hispanic White	464
Black	46
Hispanic	226
Asian	38
Other	0
Native American	0

**Age**
From 65 to 74	250
From 75 to 84	168
85 and over	74
Less than 65	304

Conditions of Medicare patients treated by Dr. Mark Theodo Fahlen, MD in 2015

The most common conditions of Medicare patients that Dr. Mark Theodo Fahlen, MD treated during 2015 were chronic kidney disease, hypertension, diabetes and high cholesterol.

Hypertension	75
High Cholesterol	57
Stroke	9
Ischemic Heart Disease	48
Depression	19
Chronic Kidney Disease	75
Asthma	12
Osteoperosis	5
Atrial Fibrilation	15
Heart Failure	46
Chronic Obstructive Pulmonary Disease	21
Diabetes	59
Dementia	10
Cancer	7

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Mark Theodo Fahlen, MD treated as a nephrologist in Modesto, CA during 2016 were dialysis, hospital care and inpatient care.

Volume of procedures performed by Dr. Mark Theodo Fahlen, MD for Medicare patients.

dialysis	184
doctor visit	642
hospital care	179
inpatient care	179

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Theodo Fahlen, MD.

**Gender**
Male	198
Female	170

**Ethnicity**
Non-Hispanic White	222
Black	0
Hispanic	106
Asian	19
Other	0
Native American	0

**Age**
From 65 to 74	121
From 75 to 84	87
85 and over	35
Less than 65	125

Conditions of Medicare patients treated by Dr. Mark Theodo Fahlen, MD in 2016

The most common conditions of Medicare patients that Dr. Mark Theodo Fahlen, MD treated during 2016 were chronic kidney disease, hypertension, diabetes and high cholesterol.

Hypertension	75
High Cholesterol	57
Stroke	7
Ischemic Heart Disease	45
Depression	18
Chronic Kidney Disease	75
Asthma	22
Osteoperosis	5
Atrial Fibrilation	13
Heart Failure	39
Chronic Obstructive Pulmonary Disease	20
Diabetes	60
Dementia	10
Cancer	9

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Mark Theodo Fahlen, MD treated as a nephrologist in Modesto, CA during 2017 were hospital care, inpatient care and dialysis.

Volume of procedures performed by Dr. Mark Theodo Fahlen, MD for Medicare patients.

dialysis	294
doctor visit	695
hospital care	393
inpatient care	393

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Theodo Fahlen, MD.

**Gender**
Male	227
Female	195

**Ethnicity**
Non-Hispanic White	259
Black	15
Hispanic	114
Asian	20
Other	0
Native American	0

**Age**
From 65 to 74	139
From 75 to 84	112
85 and over	36
Less than 65	135

Conditions of Medicare patients treated by Dr. Mark Theodo Fahlen, MD in 2017

The most common conditions of Medicare patients that Dr. Mark Theodo Fahlen, MD treated during 2017 were chronic kidney disease, hypertension, high cholesterol and diabetes.

Hypertension	75
High Cholesterol	60
Stroke	8
Ischemic Heart Disease	50
Depression	21
Chronic Kidney Disease	75
Asthma	8
Osteoperosis	5
Atrial Fibrilation	18
Heart Failure	44
Chronic Obstructive Pulmonary Disease	23
Diabetes	59
Dementia	13
Cancer	8

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Mark Theodo Fahlen, MD treated as a nephrologist in Modesto, CA during 2018 were hospital care, inpatient care, dialysis and hemofiltration.

Volume of procedures performed by Dr. Mark Theodo Fahlen, MD for Medicare patients.

dialysis	498
doctor visit	742
hemofiltration	91
hospital care	681
inpatient care	681

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Theodo Fahlen, MD.

**Gender**
Male	243
Female	222

**Ethnicity**
Non-Hispanic White	282
Black	16
Hispanic	130
Asian	25
Other	0
Native American	0

**Age**
From 65 to 74	150
From 75 to 84	132
85 and over	42
Less than 65	141

Conditions of Medicare patients treated by Dr. Mark Theodo Fahlen, MD in 2018

The most common conditions of Medicare patients that Dr. Mark Theodo Fahlen, MD treated during 2018 were chronic kidney disease, hypertension, high cholesterol and diabetes.

Hypertension	75
High Cholesterol	66
Stroke	9
Ischemic Heart Disease	48
Depression	25
Chronic Kidney Disease	75
Asthma	7
Osteoperosis	6
Atrial Fibrilation	16
Heart Failure	46
Chronic Obstructive Pulmonary Disease	23
Diabetes	59
Dementia	16
Cancer	9

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Mark Theodo Fahlen, MD treated as a nephrologist in Modesto, CA during 2019 were hospital care, inpatient care, dialysis and hemofiltration.

Volume of procedures performed by Dr. Mark Theodo Fahlen, MD for Medicare patients.

dialysis	587
doctor visit	728
hemofiltration	89
hospital care	757
inpatient care	757

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Theodo Fahlen, MD.

**Gender**
Male	264
Female	224

**Ethnicity**
Non-Hispanic White	292
Black	21
Hispanic	138
Asian	26
Other	11
Native American	0

**Age**
From 65 to 74	162
From 75 to 84	124
85 and over	54
Less than 65	148

Conditions of Medicare patients treated by Dr. Mark Theodo Fahlen, MD in 2019

The most common conditions of Medicare patients that Dr. Mark Theodo Fahlen, MD treated during 2019 were chronic kidney disease, hypertension, high cholesterol and diabetes.

Hypertension	75
High Cholesterol	63
Stroke	9
Ischemic Heart Disease	52
Depression	26
Chronic Kidney Disease	75
Asthma	6
Osteoperosis	5
Atrial Fibrilation	18
Heart Failure	47
Chronic Obstructive Pulmonary Disease	22
Diabetes	61
Dementia	15
Cancer	10

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Mark Theodo Fahlen, MD treated as a nephrologist in Modesto, CA during 2020 were hospital care, inpatient care, dialysis and hemofiltration.

Volume of procedures performed by Dr. Mark Theodo Fahlen, MD for Medicare patients.

dialysis	534
doctor visit	687
hemofiltration	42
hospital care	749
inpatient care	749

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Theodo Fahlen, MD.

**Gender**
Male	255
Female	223

**Ethnicity**
Non-Hispanic White	272
Black	20
Hispanic	142
Asian	27
Other	0
Native American	0

**Age**
From 65 to 74	179
From 75 to 84	125
85 and over	38
Less than 65	136

Conditions of Medicare patients treated by Dr. Mark Theodo Fahlen, MD in 2020

The most common conditions of Medicare patients that Dr. Mark Theodo Fahlen, MD treated during 2020 were chronic kidney disease, hypertension, high cholesterol and diabetes.

Hypertension	75
High Cholesterol	68
Stroke	10
Ischemic Heart Disease	50
Depression	24
Chronic Kidney Disease	75
Asthma	7
Osteoperosis	7
Atrial Fibrilation	14
Heart Failure	47
Chronic Obstructive Pulmonary Disease	20
Diabetes	62
Dementia	13
Cancer	9

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Mark Theodo Fahlen, MD treated as a nephrologist in Modesto, CA during 2021 were hospital care, inpatient care, dialysis and hemofiltration.

Volume of procedures performed by Dr. Mark Theodo Fahlen, MD for Medicare patients.

dialysis	477
doctor visit	759
hemofiltration	68
hospital care	563
inpatient care	563

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Theodo Fahlen, MD.

**Gender**
Male	265
Female	241

**Ethnicity**
Non-Hispanic White	291
Black	19
Hispanic	154
Asian	25
Other	0
Native American	0

**Age**
From 65 to 74	184
From 75 to 84	142
85 and over	48
Less than 65	132

Conditions of Medicare patients treated by Dr. Mark Theodo Fahlen, MD in 2021

The most common conditions of Medicare patients that Dr. Mark Theodo Fahlen, MD treated during 2021 were chronic kidney disease, hypertension, high cholesterol and diabetes.

Hypertension	75
High Cholesterol	69
Stroke	9
Ischemic Heart Disease	50
Depression	27
Chronic Kidney Disease	75
Asthma	7
Osteoperosis	6
Atrial Fibrilation	14
Heart Failure	47
Chronic Obstructive Pulmonary Disease	17
Diabetes	62
Dementia	15
Cancer	10

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Mark Theodo Fahlen, MD treated as a nephrologist in Modesto, CA during 2022 were hospital care, inpatient care and dialysis.

Volume of procedures performed by Dr. Mark Theodo Fahlen, MD for Medicare patients.

dialysis	391
doctor visit	696
hospital care	602
inpatient care	602

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Theodo Fahlen, MD.

**Gender**
Male	264
Female	234

**Ethnicity**
Non-Hispanic White	285
Black	19
Hispanic	142
Asian	32
Other	0
Native American	0

**Age**
From 65 to 74	166
From 75 to 84	153
85 and over	51
Less than 65	128

Conditions of Medicare patients treated by Dr. Mark Theodo Fahlen, MD in 2022

The most common conditions of Medicare patients that Dr. Mark Theodo Fahlen, MD treated during 2022 were chronic kidney disease, high cholesterol, hypertension and diabetes.

Hypertension	75
High Cholesterol	75
Stroke	15
Ischemic Heart Disease	43
Depression	24
Chronic Kidney Disease	75
Asthma	9
Osteoperosis	9
Atrial Fibrilation	27
Heart Failure	42
Chronic Obstructive Pulmonary Disease	26
Diabetes	59
Dementia	8
Cancer	13

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

The top procedures that Dr. Mark Theodo Fahlen, MD treated as a nephrologist in Modesto, CA during 2023 were hospital care, inpatient care and dialysis.

Volume of procedures performed by Dr. Mark Theodo Fahlen, MD for Medicare patients.

dialysis	344
doctor visit	647
hospital care	356
inpatient care	356

2023 Medicare Patient Data

Information about Medicare patients treated by Dr. Mark Theodo Fahlen, MD.

**Gender**
Male	225
Female	218

**Ethnicity**
Non-Hispanic White	246
Black	0
Hispanic	125
Asian	31
Other	20
Native American	0

**Age**
From 65 to 74	156
From 75 to 84	127
85 and over	45
Less than 65	115

Conditions of Medicare patients treated by Dr. Mark Theodo Fahlen, MD in 2023

The most common conditions of Medicare patients that Dr. Mark Theodo Fahlen, MD treated during 2023 were chronic kidney disease, high cholesterol, hypertension and diabetes.

Hypertension	75
High Cholesterol	75
Stroke	11
Ischemic Heart Disease	42
Depression	26
Chronic Kidney Disease	75
Asthma	12
Osteoperosis	10
Atrial Fibrilation	29
Heart Failure	42
Chronic Obstructive Pulmonary Disease	28
Diabetes	60
Dementia	9
Cancer	13

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2013 - 2023

Volume of procedures performed by Dr. Mark Theodo Fahlen, MD for Medicare patients.

The highest averages for the top procedures that Dr. Mark Theodo Fahlen, MD treated as a nephrologist in Modesto, CA were hospital care, inpatient care, dialysis and hemofiltration.

dialysis	381
doctor visit	691
hemofiltration	72
hospital care	520
inpatient care	520

Average Medicare Patient Data From 2013 - 2023

Information about Medicare patients treated by Dr. Mark Theodo Fahlen, MD.

**Gender**
Male	256
Female	224

**Ethnicity**
Black / African American	18
Asian / Pacific Islander	24
Non-Hispanic White	282
Native American / Alaskan Native	0
Hispanic	135
Other	2

**Age**
75 to 84	125
85 and over	46
Less than 65	149
65 to 74	159

Average of Total of Conditions of Medicare patients treated by Dr. Mark Theodo Fahlen, MD From 2013 - 2023

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

Hypertension	75
High Cholesterol	64
Stroke	9
Ischemic Heart Disease	47
Depression	22
Chronic Kidney Disease	75
Asthma	9
Osteoporosis	6
Heart Failure	44
Chronic Obstructive Pulmonary Disease	22
Diabetes	59
Atrial Fibrillation	17
Cancer	9
Dementia	12

Education & Training

Dr. Mark Theodo Fahlen, MD graduated from Albany Medical College in 1998. He has a state license in California.

Medical School: Albany Medical College (1998)

Licensed In: California

Ratings & Reviews

Dr. Mark Theodo Fahlen, MD has a high overall rating with an average of 4.2 out of 5 stars based on 5 ratings. We collect ratings and reviews of Dr. Mark Theodo Fahlen, MD from all over the web to help you find the right in Modesto, CA.

4.2

Overall Rating

(5 Ratings)

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General Payments

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

**Payments by Company**
Keryx Biopharmaceuticals, Inc.	$581 Auryxia $581
AstraZeneca Pharmaceuticals LP	$260 LOKELMA $208	BRILINTA $52
SANOFI-AVENTIS U.S. LLC	$215 RENVELA $156	TOUJEO $59
Relypsa, Inc.	$203 VELTASSA $203
Fresenius USA Marketing, Inc.	$193 Velphoro $180	Dialyzers $13
Other	$869 Parsabiv $121	Renal - PD $102	Rayaldee $99	Colcrys $93	JYNARQUE $92	Other $362

**Types of Payments**
Food and Beverage	$2,049
Education	$262
Gift	$10

Biography

Dr. Mark Fahlen is an adult nephrology specialist in Modesto, CA. He has a 4.0 out of 5 star average patient rating. He graduated from Albany Medical College.