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Dr. Sagar U. Nigwekar, MD, MBBS

(Dr. Sagar Uday Nigwekar, MD)
Specializes in: Adult Nephrology and Hospital Medicine (Hospitalist)
Seth G.S. Medical College
Professional interests include: chronic kidney disease (CKD), kidney stones
165 Cambridge Street Suite 302
Boston, MA 02114

Dr. Sagar U. Nigwekar, MD, MBBS is a nephrologist in Boston, MA specializing in adult nephrology and hospital medicine (hospitalist). He graduated from Seth G.S. Medical College. Dr. Sagar U. Nigwekar, MD, MBBS is affiliated with Tufts Medicine, Massachusetts General Hospital, MASSACHUSETTS ACUTE CARE SPECIALISTS PC and MASSACHUSETTS GENERAL PHYSICIANS ORGANIZATION INC.

View Doctor's Full Profile (617) 726-5050

Office Locations

Massachusetts General Hospital

165 Cambridge Street Suite 302
Boston, MA 02114
(617) 726-5050
open_in_new
585 Lebanon Street
Melrose, MA 02176
open_in_new

Some issues Dr. Sagar U. Nigwekar, MD, MBBS can help you with:

Kidney Stones

Kidney stones are hard deposits that form in the kidneys, made up of minerals that are normally present in urine. They can vary in size, from as small as a grain of sand to as large as a nickel, occasionally even larger. Sometimes they lodge in the kidney, and sometimes they break free and make their way out through the urinary tract, which can be extremely painful.

Kidney stones can be smooth or jagged and are yellow to brown in color. They are mostly comprised of the minerals calcium, oxalate, and phosphorus. Examining the stones to see what they are made of can show what caused the stone to be formed in the first place. For example, a stone made of mostly calcium, which is the most common type, can happen any time the urine becomes too concentrated due to dehydration or a blockage in the kidney. A uric acid stone forms when acid levels in the urine get too high, usually due to excessive consumption of animal protein such as meat and fish. A struvite stone is a sign of certain infections, and a cystine stone can be due to a genetic disorder that raises the risk of kidney stones.

The most common symptom of kidney stones is pain, either in the back or lower abdomen, or severe pain when urinating. There may also be blood in the urine. Treatment for kidney stones depends on how large the stone is. Very small stones can pass out of the body on their own, and they do not require treatment other than drinking adequate water and taking pain killers. Larger stones need to be broken apart and removed. The main treatment options are:

  • Shock wave lithotripsy, which uses sound wave vibrations to break apart the stone
  • Percutaneous nephrolithotomy, or the use of a very tiny tool (like a wire inserted through the back) to break apart and remove the stone
  • Ureteroscopy, a thin tube inserted through the urethra and bladder to the stone, where tiny tools can grasp the stone and remove

People who have had one kidney stone are at risk of developing another. To reduce this risk, patients are given instructions specific to the type of stone they developed. Generally the instructions will include drinking more water to dilute the urine, but it may also involve lowering sodium intake or eating less meat.

In The News (see more mentions in the news)

“In this MedPage Today video, Sagar Nigwekar, MD, of Massachusetts General Hospital in Boston, explains the mechanism of action, study design, and the agent's potential role in this setting.”—"Novel Drug Reduced Proteinuria by 46% in IgA Nephropathy Trial", MedPage Today, December 2025
“In this MedPage Today video, Sagar Nigwekar, MD, of Massachusetts General Hospital in Boston, breaks down the trial design, key efficacy findings, and next steps for this activity of...”—"Monoclonal Antibody Reduced Proteinuria in IgA Nephropathy", MedPage Today, November 2025
“Moderator Sagar Nigwekar, MD, of Massachusetts General Hospital in Boston, is joined by Edgar Lerma, MD, of the University of Illinois Chicago, and Shikha Wadhwani, MD, of the University of Texas...”—"Sparsentan for Focal Segmental Glomerulosclerosis", MedPage Today, May 2025

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. Sagar U. Nigwekar, MD, MBBS treated as a nephrologist in Boston, MA during 2012 were hospital care and inpatient care.

Volume of procedures performed by Dr. Sagar U. Nigwekar, MD, MBBS for Medicare patients.

hospital care 54
inpatient care 54

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Sagar U. Nigwekar, MD, MBBS treated as a nephrologist in Boston, MA during 2013 were hospital care, inpatient care and dialysis.

Volume of procedures performed by Dr. Sagar U. Nigwekar, MD, MBBS for Medicare patients.

dialysis 66
doctor visit 56
hospital care 319
inpatient care 319

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Sagar U. Nigwekar, MD, MBBS.

Gender
Male 124
Female 103
Ethnicity
Non-Hispanic White 193
Black 11
Hispanic 0
Asian 0
Other 0
Native American 0
Age
From 65 to 74 73
From 75 to 84 64
85 and over 36
Less than 65 54

Conditions of Medicare patients treated by Dr. Sagar U. Nigwekar, MD, MBBS in 2013

Hypertension 75
High Cholesterol 67
Stroke 11
Ischemic Heart Disease 59
Depression 43
Chronic Kidney Disease 72
Asthma 14
Osteoperosis 12
Atrial Fibrilation 27
Heart Failure 56
Chronic Obstructive Pulmonary Disease 32
Diabetes 48
Dementia 22
Cancer 18

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Sagar U. Nigwekar, MD, MBBS treated as a nephrologist in Boston, MA during 2014 were hospital care, inpatient care, dialysis and hemofiltration.

Volume of procedures performed by Dr. Sagar U. Nigwekar, MD, MBBS for Medicare patients.

dialysis 134
doctor visit 140
hemofiltration 50
hospital care 374
inpatient care 374

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Sagar U. Nigwekar, MD, MBBS.

Gender
Male 139
Female 141
Ethnicity
Non-Hispanic White 227
Black 23
Hispanic 16
Asian 0
Other 0
Native American 0
Age
From 65 to 74 91
From 75 to 84 67
85 and over 55
Less than 65 67

Conditions of Medicare patients treated by Dr. Sagar U. Nigwekar, MD, MBBS in 2014

Hypertension 75
High Cholesterol 62
Stroke 16
Ischemic Heart Disease 62
Depression 45
Chronic Kidney Disease 75
Asthma 15
Osteoperosis 15
Atrial Fibrilation 30
Heart Failure 55
Chronic Obstructive Pulmonary Disease 30
Diabetes 51
Dementia 20
Cancer 17

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Sagar U. Nigwekar, MD, MBBS treated as a nephrologist in Boston, MA during 2015 were hospital care, inpatient care, dialysis and hemofiltration.

Volume of procedures performed by Dr. Sagar U. Nigwekar, MD, MBBS for Medicare patients.

dialysis 217
doctor visit 209
hemofiltration 71
hospital care 568
inpatient care 568

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Sagar U. Nigwekar, MD, MBBS.

Gender
Male 360
Female 338
Ethnicity
Non-Hispanic White 574
Black 42
Hispanic 36
Asian 0
Other 0
Native American 0
Age
From 65 to 74 212
From 75 to 84 200
85 and over 120
Less than 65 166

Conditions of Medicare patients treated by Dr. Sagar U. Nigwekar, MD, MBBS in 2015

Hypertension 75
High Cholesterol 66
Stroke 11
Ischemic Heart Disease 68
Depression 42
Chronic Kidney Disease 75
Asthma 23
Osteoperosis 13
Atrial Fibrilation 34
Heart Failure 65
Chronic Obstructive Pulmonary Disease 27
Diabetes 57
Dementia 22
Cancer 18

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Sagar U. Nigwekar, MD, MBBS treated as a nephrologist in Boston, MA during 2016 were hospital care, inpatient care, dialysis and hemofiltration.

Volume of procedures performed by Dr. Sagar U. Nigwekar, MD, MBBS for Medicare patients.

dialysis 302
doctor visit 187
hemofiltration 45
hospital care 537
inpatient care 537

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Sagar U. Nigwekar, MD, MBBS.

Gender
Male 178
Female 168
Ethnicity
Non-Hispanic White 279
Black 30
Hispanic 19
Asian 0
Other 0
Native American 0
Age
From 65 to 74 115
From 75 to 84 87
85 and over 53
Less than 65 91

Conditions of Medicare patients treated by Dr. Sagar U. Nigwekar, MD, MBBS in 2016

Hypertension 75
High Cholesterol 64
Stroke 14
Ischemic Heart Disease 64
Depression 43
Chronic Kidney Disease 75
Asthma 33
Osteoperosis 13
Atrial Fibrilation 28
Heart Failure 62
Chronic Obstructive Pulmonary Disease 29
Diabetes 54
Dementia 25
Cancer 19

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Sagar U. Nigwekar, MD, MBBS treated as a nephrologist in Boston, MA during 2017 were hospital care, inpatient care, dialysis and hemofiltration.

Volume of procedures performed by Dr. Sagar U. Nigwekar, MD, MBBS for Medicare patients.

dialysis 221
doctor visit 188
hemofiltration 68
hospital care 472
inpatient care 472

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Sagar U. Nigwekar, MD, MBBS.

Gender
Male 172
Female 186
Ethnicity
Non-Hispanic White 295
Black 28
Hispanic 17
Asian 0
Other 0
Native American 0
Age
From 65 to 74 109
From 75 to 84 109
85 and over 61
Less than 65 79

Conditions of Medicare patients treated by Dr. Sagar U. Nigwekar, MD, MBBS in 2017

Hypertension 75
High Cholesterol 63
Stroke 15
Ischemic Heart Disease 65
Depression 43
Chronic Kidney Disease 75
Asthma 17
Osteoperosis 15
Atrial Fibrilation 32
Heart Failure 59
Chronic Obstructive Pulmonary Disease 34
Diabetes 51
Dementia 30
Cancer 13

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Sagar U. Nigwekar, MD, MBBS treated as a nephrologist in Boston, MA during 2018 were hospital care, inpatient care, dialysis and outpatient care.

Volume of procedures performed by Dr. Sagar U. Nigwekar, MD, MBBS for Medicare patients.

dialysis 59
doctor visit 191
hospital care 661
inpatient care 648
outpatient care 13

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Sagar U. Nigwekar, MD, MBBS.

Gender
Male 184
Female 192
Ethnicity
Non-Hispanic White 308
Black 25
Hispanic 20
Asian 12
Other 0
Native American 0
Age
From 65 to 74 113
From 75 to 84 120
85 and over 60
Less than 65 83

Conditions of Medicare patients treated by Dr. Sagar U. Nigwekar, MD, MBBS in 2018

Hypertension 75
High Cholesterol 68
Stroke 15
Ischemic Heart Disease 60
Depression 40
Chronic Kidney Disease 75
Asthma 14
Osteoperosis 14
Atrial Fibrilation 29
Heart Failure 52
Chronic Obstructive Pulmonary Disease 29
Diabetes 47
Dementia 30
Cancer 21

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Sagar U. Nigwekar, MD, MBBS treated as a nephrologist in Boston, MA during 2019 were hospital care, inpatient care and dialysis.

Volume of procedures performed by Dr. Sagar U. Nigwekar, MD, MBBS for Medicare patients.

dialysis 126
doctor visit 172
hospital care 399
inpatient care 399

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Sagar U. Nigwekar, MD, MBBS.

Gender
Male 122
Female 163
Ethnicity
Non-Hispanic White 233
Black 23
Hispanic 17
Asian 0
Other 0
Native American 0
Age
From 65 to 74 93
From 75 to 84 78
85 and over 46
Less than 65 68

Conditions of Medicare patients treated by Dr. Sagar U. Nigwekar, MD, MBBS in 2019

Hypertension 75
High Cholesterol 68
Stroke 12
Ischemic Heart Disease 64
Depression 46
Chronic Kidney Disease 75
Asthma 13
Osteoperosis 14
Atrial Fibrilation 28
Heart Failure 55
Chronic Obstructive Pulmonary Disease 27
Diabetes 52
Dementia 32
Cancer 13

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Sagar U. Nigwekar, MD, MBBS treated as a nephrologist in Boston, MA during 2020 were hospital care, inpatient care, hemofiltration and dialysis.

Volume of procedures performed by Dr. Sagar U. Nigwekar, MD, MBBS for Medicare patients.

dialysis 50
doctor visit 61
hemofiltration 50
hospital care 458
inpatient care 458

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Sagar U. Nigwekar, MD, MBBS.

Gender
Male 162
Female 148
Ethnicity
Non-Hispanic White 269
Black 0
Hispanic 20
Asian 0
Other 0
Native American 0
Age
From 65 to 74 110
From 75 to 84 89
85 and over 50
Less than 65 61

Conditions of Medicare patients treated by Dr. Sagar U. Nigwekar, MD, MBBS in 2020

Hypertension 75
High Cholesterol 69
Stroke 12
Ischemic Heart Disease 59
Depression 47
Chronic Kidney Disease 75
Asthma 15
Osteoperosis 15
Atrial Fibrilation 25
Heart Failure 51
Chronic Obstructive Pulmonary Disease 27
Diabetes 49
Dementia 37
Cancer 11

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Sagar U. Nigwekar, MD, MBBS treated as a nephrologist in Boston, MA during 2021 were hospital care, inpatient care and dialysis.

Volume of procedures performed by Dr. Sagar U. Nigwekar, MD, MBBS for Medicare patients.

dialysis 18
doctor visit 141
hospital care 556
inpatient care 556

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Sagar U. Nigwekar, MD, MBBS.

Gender
Male 175
Female 130
Ethnicity
Non-Hispanic White 238
Black 22
Hispanic 23
Asian 0
Other 0
Native American 0
Age
From 65 to 74 104
From 75 to 84 96
85 and over 40
Less than 65 65

Conditions of Medicare patients treated by Dr. Sagar U. Nigwekar, MD, MBBS in 2021

Hypertension 75
High Cholesterol 74
Stroke 13
Ischemic Heart Disease 68
Depression 48
Chronic Kidney Disease 75
Asthma 14
Osteoperosis 13
Atrial Fibrilation 25
Heart Failure 59
Chronic Obstructive Pulmonary Disease 27
Diabetes 57
Dementia 30
Cancer 18

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Sagar U. Nigwekar, MD, MBBS treated as a nephrologist in Boston, MA during 2022 were hospital care and inpatient care.

Volume of procedures performed by Dr. Sagar U. Nigwekar, MD, MBBS for Medicare patients.

doctor visit 159
hospital care 648
inpatient care 648

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Sagar U. Nigwekar, MD, MBBS.

Gender
Male 155
Female 129
Ethnicity
Non-Hispanic White 240
Black 11
Hispanic 16
Asian 0
Other 0
Native American 0
Age
From 65 to 74 87
From 75 to 84 97
85 and over 55
Less than 65 45

Conditions of Medicare patients treated by Dr. Sagar U. Nigwekar, MD, MBBS in 2022

Hypertension 75
High Cholesterol 75
Stroke 14
Ischemic Heart Disease 56
Depression 39
Chronic Kidney Disease 75
Asthma 15
Osteoperosis 19
Atrial Fibrilation 38
Heart Failure 52
Chronic Obstructive Pulmonary Disease 31
Diabetes 57
Dementia 26
Cancer 22

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. Sagar U. Nigwekar, MD, MBBS for Medicare patients.

The highest averages for the top procedures that Dr. Sagar U. Nigwekar, MD, MBBS treated as a nephrologist in Boston, MA were hospital care, inpatient care, dialysis and hemofiltration.

dialysis 132
doctor visit 150
hemofiltration 56
hospital care 458
inpatient care 457
outpatient care 13

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. Sagar U. Nigwekar, MD, MBBS.

Gender
Male 161
Female 154
Ethnicity
Black / African American 19
Asian / Pacific Islander 1
Non-Hispanic White 259
Native American / Alaskan Native 0
Hispanic 16
Other 0
Age
75 to 84 91
85 and over 52
Less than 65 70
65 to 74 100

Average of Total of Conditions of Medicare patients treated by Dr. Sagar U. Nigwekar, MD, MBBS From 2012 - 2022

The highest averages of the most common conditions of Medicare patients that Dr. Sagar U. Nigwekar, MD, MBBS treated were chronic kidney disease, hypertension, high cholesterol and ischemic heart disease.

Hypertension 68
High Cholesterol 61
Stroke 12
Ischemic Heart Disease 56
Depression 39
Chronic Kidney Disease 67
Asthma 15
Osteoporosis 13
Heart Failure 51
Chronic Obstructive Pulmonary Disease 26
Diabetes 47
Atrial Fibrillation 26
Dementia 24
Cancer 15

Education & Training

Dr. Sagar U. Nigwekar, MD, MBBS graduated from Seth G.S. Medical College. He completed residency at Rochester General Hospital. He is certified by the Nephrology, American Board of Internal Medicine and has a state license in Massachusetts.

Medical School: Seth G.S. Medical College

Residency: Rochester General Hospital

Board Certification: Nephrology, American Board of Internal Medicine

Licensed In: Massachusetts

Affiliations & Hospitals

Dr. Sagar U. Nigwekar, MD, MBBS is associated with these hospitals and organizations:

Tufts Medicine
Massachusetts General Hospital
MASSACHUSETTS ACUTE CARE SPECIALISTS PC
MASSACHUSETTS GENERAL PHYSICIANS ORGANIZATION INC

Insurance Information

Please note: Insurance information may change at any time, and the provider may accept your insurance plan even if it is not listed below. Please contact the provider's office to confirm that your insurance is accepted.

Dr. Sagar U. Nigwekar, MD, MBBS appears to accept the following insurance providers: Harvard Pilgrim Health Care, MultiPlan, Tufts Health Plan, United Healthcare, Aetna, TRICARE, Medicare, Medicaid, Humana, Railroad Medicare, Coventry, Cigna, Blue California, Beech Street, WellPoint, Medicare ACO, WellSense, Senior Whole Health, Fallon Health, Commonwealth Care Alliance, Blue Cross Blue Shield Medicare, Maine Community Health Options, Mass General Brigham Health Plan, MassHealth and WellSense NH.

Insurance Accepted by Provider includes:

According to our sources, Dr. Sagar U. Nigwekar, MD, MBBS accepts the following insurance providers:

Harvard Pilgrim Health Care
MultiPlan
Tufts Health Plan
United Healthcare
Aetna
TRICARE
Medicare
Medicaid
Humana
Railroad Medicare
Coventry
Cigna
Blue California
Beech Street
WellPoint
Medicare ACO
WellSense
Senior Whole Health
Fallon Health
Commonwealth Care Alliance
Blue Cross Blue Shield Medicare
Maine Community Health Options
Mass General Brigham Health Plan
MassHealth
WellSense NH

Ratings & Reviews

Dr. Sagar U. Nigwekar, MD, MBBS has an exceptional overall rating with an average of 4.95 out of 5 stars based on 20 ratings. We collect ratings and reviews of Dr. Sagar U. Nigwekar, MD, MBBS from all over the web to help you find the right in Boston, MA. 

4.95
Overall Rating
Leave a Review

General Payments

These charts describe general payments received by Dr. Sagar U. Nigwekar, MD, MBBS. Doctors may receive payments for a number of reasons, including meal compensation, travel compensation, and consulting.

Payments by Company
SANOFI-AVENTIS U.S. LLC $32,241 NO PRODUCT DISCUSSED
$18,109 		RENVELA
$14,114
$18
Fresenius USA Marketing, Inc. $23,221 Velphoro
$16,315 		Critline - Monitors
$4,000 		Not Product Related
$82
$2,824
Vifor Pharma, Inc. $4,800 VELTASSA
$200 		KORSUVA
$122
$4,478
GENZYME CORPORATION $1,880 RENVELA
$1,880
Vifor (International) Ltd. $1,815
$1,815
Other $3,212 Carnitor
$31
$3,181
Types of Payments
Consulting Fee $32,052
Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program $13,750
Honoraria $9,375
Travel and Lodging $8,057
Food and Beverage $2,972
Other $964

Research Payments

Dr. Sagar U. Nigwekar, MD, MBBS has received 9 research payments totaling $20,020.

Biography

Dr. Sagar Nigwekar is a physician who specializes in hospital medicine (hospitalist) and adult nephrology. Before completing his residency at Rochester General Hospital, Dr. Nigwekar attended medical school at Seth G.S. Medical College. Dr. Nigwekar has a special interest in kidney stones and chronic kidney disease (CKD). On average, patients gave him a rating of 5.0 stars (out of 5). He accepts several insurance carriers, including Blue California, Coventry, and Viant. Dr. Nigwekar (or staff) speaks Marathi and Hindi. Dr. Nigwekar is affiliated with Tufts Medicine and Massachusetts General Hospital. Tufts Medicine reports that Dr. Nigwekar is not accepting new patients.

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