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Dr. Jacek Zajac, MD

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Specializes in: Adult Endocrinology

Jagiellonian University Medical College (1991)

Professional interests include: metabolism, obesity, brain tumor, and more.

2500 S. Highland Avenue Suite 104
Lombard, IL 60148

(630) 629-3610

Dr. Jacek Zajac, MD is an endocrinologist in Lombard, IL specializing in adult endocrinology. He graduated from Jagiellonian University Medical College in 1991 and has 35 years of experience. Dr. Jacek Zajac, MD is affiliated with Endeavor Health and Advocate Health Care.

Office Locations

Endeavor Health

2500 S. Highland Avenue Suite 104
Lombard, IL 60148

(630) 629-3610

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Some issues Dr. Jacek Zajac, MD can help you with:

Thyroid Problems

Thyroid problems are a group of conditions that alter hormone regulation and metabolism. The thyroid is a small, butterfly-shaped gland located in the lower neck, just below the Adam's apple (laryngeal prominence) and larynx (voice box). Despite its small size, the thyroid has an outsized effect on the body by regulating hormones that control metabolism. Metabolism is the body's process of converting consumed food into fuel to power the entire body. Heart rate, weight, cholesterol, body temperature, and even physical growth and development are all affected by the metabolism.

When the thyroid malfunctions, the body is unable to properly process and allocate energy. Thyroid problems, such as hyperthyroidism (overactive thyroid) and hypothyroidism (underactive thyroid), cause irregular metabolism. In some cases, the body produces antibodies that attack the thyroid cells for unknown reasons. The damaged thyroid responds by releasing either too little or too much T3 and T4 thyroid hormones. Thyroid malfunctions may also arise from genetic causes or iodine deficiency. Thyroid problems may include:

Hashimoto's thyroiditis, an autoimmune disease that causes hypothyroidism
Graves' disease, an autoimmune disease that causes hyperthyroidism
Goiter
Thyroid nodule
Thyroid cancer

Hashimoto's is the leading cause of hypothyroidism, which is when the thyroid does not produce enough hormones to stimulate adequate metabolism. The condition is diagnosed by blood tests that measure TSH (thyroid stimulating hormone) and detect Hashimoto's antibodies. Symptoms of hypothyroidism include sluggish metabolism, inflammation, fatigue, weight gain, brittle hair, dry skin, and sensitivity to cold. To supplement impaired thyroid function, patients with Hashimoto's are typically prescribed synthetic thyroid hormone pills. Such patients may need to consume synthetic thyroids for the rest of their lives. Other treatments may include dietary changes, such as the avoidance of certain foods and medication to reduce inflammation. Frequent blood tests can inform patients if their TSH levels are within a normal range.

Grave's disease is most frequently the cause of hyperthyroidism, which is when the thyroid produces too many hormones, overstimulating one's metabolism. The condition is also diagnosed by blood tests that measure TSH and detect Grave's antibodies. Elevated heart rate, high blood pressure, sweating, bulging eyes, and weight loss are common symptoms of hyperthyroidism. Treatments for hyperthyroidism include oral radioactive iodine, which slowly shrinks the thyroid, slowing the production of excess thyroid hormone. Other anti-thyroid medications such as methimazole (Tapazole) also reduce the production of thyroid hormones. Blood pressure medications known as beta blockers can ease the increased heart rate caused by hyperthyroidism. If treatments are unsuccessful, patients may be prescribed a thyroidectomy, or surgery to remove part or all of the thyroid. Some patients with hyperthyroidism may require ophthalmological (eye medicine) treatments such as eye drops, prednisone, and surgery to reduce eye swelling and bulging.

Untreated thyroid disorders frequently lead to goiters or thyroid nodules. A thyroid goiter is a large lump that can be felt near the base of the neck and is made of swollen thyroid tissue or nodules (excess cell growth). Nodules and goiters are diagnosed by CT scan or ultrasound. Obstructive goiters can cause pain, coughing, and abnormal breathing. The most common cause of goiters is hyperthyroidism (overactive thyroid). However, Hashimoto's is also known to cause goiters or nodules. Goiters develop from continued damage from antibodies to the thyroid over time. At times, a goiter can result from a cancerous thyroid tumor. Most goiters and nodules are themselves benign.

The exact causes of thyroid cancer are unknown. People who develop thyroid cancer may or may not have another thyroid problem such as Hashimoto's or Grave's disease. Symptoms of thyroid cancer include a nodule that can be felt on the neck, hoarseness, difficulty swallowing, swelling in the neck, and neck and throat pain. CT and MRI scans are used to diagnose thyroid cancer. There are four types of thyroid cancer which vary in intensity. Thyroidectomy (thyroid removal surgery) is usually prescribed to treat thyroid cancer.

Thyroid problems are often long-term conditions that require some form of treatment. With regular monitoring and medication, many people with thyroid problems are able to lead active and fulfilling lives.

Noteworthy Medicare Patient Procedures Performed by Dr. Jacek Zajac, MD in 2023

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

Top 25%

By Volume:

inpatient hospital care

In 2012, Dr. Jacek Zajac, MD performed more inpatient hospital care (for patient admitted to hospital) procedures for Medicare patients than 75% of providers in related specialties within Illinois.

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. Jacek Zajac, MD treated as an endocrinologist in Lombard, IL during 2012 were hospital care, inpatient care, preventive care and vaccines.

Volume of procedures performed by Dr. Jacek Zajac, MD for Medicare patients.

doctor visit	840
hospital care	870
inpatient care	870
preventive care	43
vaccines	43

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Jacek Zajac, MD treated as an endocrinologist in Lombard, IL during 2013 were hospital care, inpatient care, preventive care and vaccines.

Volume of procedures performed by Dr. Jacek Zajac, MD for Medicare patients.

doctor visit	882
hospital care	946
inpatient care	932
outpatient care	14
preventive care	57
vaccines	57

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Jacek Zajac, MD.

**Gender**
Male	219
Female	328

**Ethnicity**
Non-Hispanic White	456
Black	22
Hispanic	27
Asian	31
Other	11
Native American	0

**Age**
From 65 to 74	239
From 75 to 84	183
85 and over	74
Less than 65	51

Conditions of Medicare patients treated by Dr. Jacek Zajac, MD in 2013

Hypertension	75
High Cholesterol	72
Stroke	8
Ischemic Heart Disease	47
Depression	22
Chronic Kidney Disease	33
Asthma	11
Osteoperosis	12
Atrial Fibrilation	18
Heart Failure	29
Chronic Obstructive Pulmonary Disease	22
Diabetes	58
Dementia	14
Cancer	9

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Jacek Zajac, MD treated as an endocrinologist in Lombard, IL during 2014 were hospital care, inpatient care, preventive care and vaccines.

Volume of procedures performed by Dr. Jacek Zajac, MD for Medicare patients.

doctor visit	918
hospital care	730
inpatient care	712
outpatient care	18
preventive care	87
vaccines	87

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Jacek Zajac, MD.

**Gender**
Male	202
Female	333

**Ethnicity**
Non-Hispanic White	453
Black	18
Hispanic	18
Asian	34
Other	12
Native American	0

**Age**
From 65 to 74	246
From 75 to 84	166
85 and over	78
Less than 65	45

Conditions of Medicare patients treated by Dr. Jacek Zajac, MD in 2014

Hypertension	75
High Cholesterol	69
Stroke	7
Ischemic Heart Disease	46
Depression	22
Chronic Kidney Disease	33
Asthma	8
Osteoperosis	12
Atrial Fibrilation	15
Heart Failure	26
Chronic Obstructive Pulmonary Disease	20
Diabetes	60
Dementia	14
Cancer	11

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Jacek Zajac, MD treated as an endocrinologist in Lombard, IL during 2015 were hospital care, inpatient care, preventive care and vaccines.

Volume of procedures performed by Dr. Jacek Zajac, MD for Medicare patients.

doctor visit	830
hospital care	610
inpatient care	610
preventive care	79
vaccines	79

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Jacek Zajac, MD.

**Gender**
Male	382
Female	620

**Ethnicity**
Non-Hispanic White	840
Black	0
Hispanic	36
Asian	76
Other	0
Native American	0

**Age**
From 65 to 74	446
From 75 to 84	332
85 and over	128
Less than 65	96

Conditions of Medicare patients treated by Dr. Jacek Zajac, MD in 2015

Hypertension	75
High Cholesterol	72
Stroke	6
Ischemic Heart Disease	45
Depression	24
Chronic Kidney Disease	38
Asthma	15
Osteoperosis	11
Atrial Fibrilation	17
Heart Failure	27
Chronic Obstructive Pulmonary Disease	21
Diabetes	63
Dementia	12
Cancer	11

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Jacek Zajac, MD treated as an endocrinologist in Lombard, IL during 2016 were hospital care, inpatient care, preventive care and vaccines.

Volume of procedures performed by Dr. Jacek Zajac, MD for Medicare patients.

doctor visit	947
hospital care	710
inpatient care	710
preventive care	55
vaccines	55

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Jacek Zajac, MD.

**Gender**
Male	207
Female	320

**Ethnicity**
Non-Hispanic White	432
Black	16
Hispanic	20
Asian	44
Other	15
Native American	0

**Age**
From 65 to 74	238
From 75 to 84	173
85 and over	67
Less than 65	49

Conditions of Medicare patients treated by Dr. Jacek Zajac, MD in 2016

Hypertension	75
High Cholesterol	70
Stroke	6
Ischemic Heart Disease	47
Depression	20
Chronic Kidney Disease	45
Asthma	22
Osteoperosis	13
Atrial Fibrilation	17
Heart Failure	27
Chronic Obstructive Pulmonary Disease	20
Diabetes	64
Dementia	13
Cancer	11

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Jacek Zajac, MD treated as an endocrinologist in Lombard, IL during 2017 were hospital care, inpatient care, preventive care and vaccines.

Volume of procedures performed by Dr. Jacek Zajac, MD for Medicare patients.

doctor visit	974
hospital care	603
inpatient care	592
outpatient care	11
preventive care	51
vaccines	51

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Jacek Zajac, MD.

**Gender**
Male	213
Female	313

**Ethnicity**
Non-Hispanic White	414
Black	21
Hispanic	23
Asian	49
Other	19
Native American	0

**Age**
From 65 to 74	244
From 75 to 84	183
85 and over	58
Less than 65	41

Conditions of Medicare patients treated by Dr. Jacek Zajac, MD in 2017

Hypertension	75
High Cholesterol	59
Stroke	7
Ischemic Heart Disease	45
Depression	20
Chronic Kidney Disease	46
Asthma	8
Osteoperosis	11
Atrial Fibrilation	14
Heart Failure	26
Chronic Obstructive Pulmonary Disease	18
Diabetes	63
Dementia	14
Cancer	10

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Jacek Zajac, MD treated as an endocrinologist in Lombard, IL during 2018 were hospital care, inpatient care, preventive care and vaccines.

Volume of procedures performed by Dr. Jacek Zajac, MD for Medicare patients.

doctor visit	945
hospital care	451
inpatient care	451
preventive care	51
vaccines	51

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Jacek Zajac, MD.

**Gender**
Male	213
Female	298

**Ethnicity**
Non-Hispanic White	409
Black	18
Hispanic	19
Asian	47
Other	18
Native American	0

**Age**
From 65 to 74	232
From 75 to 84	162
85 and over	69
Less than 65	48

Conditions of Medicare patients treated by Dr. Jacek Zajac, MD in 2018

Hypertension	75
High Cholesterol	71
Stroke	6
Ischemic Heart Disease	47
Depression	20
Chronic Kidney Disease	47
Asthma	8
Osteoperosis	12
Atrial Fibrilation	14
Heart Failure	26
Chronic Obstructive Pulmonary Disease	18
Diabetes	63
Dementia	12
Cancer	11

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Jacek Zajac, MD treated as an endocrinologist in Lombard, IL during 2019 were hospital care, inpatient care, preventive care and vaccines.

Volume of procedures performed by Dr. Jacek Zajac, MD for Medicare patients.

doctor visit	1026
hospital care	495
inpatient care	482
outpatient care	13
preventive care	58
vaccines	58

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Jacek Zajac, MD.

**Gender**
Male	234
Female	306

**Ethnicity**
Non-Hispanic White	437
Black	17
Hispanic	22
Asian	44
Other	20
Native American	0

**Age**
From 65 to 74	239
From 75 to 84	195
85 and over	63
Less than 65	43

Conditions of Medicare patients treated by Dr. Jacek Zajac, MD in 2019

Hypertension	75
High Cholesterol	75
Stroke	5
Ischemic Heart Disease	47
Depression	20
Chronic Kidney Disease	46
Asthma	8
Osteoperosis	11
Atrial Fibrilation	16
Heart Failure	24
Chronic Obstructive Pulmonary Disease	17
Diabetes	62
Dementia	10
Cancer	11

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Jacek Zajac, MD treated as an endocrinologist in Lombard, IL during 2020 were hospital care, inpatient care, preventive care and vaccines.

Volume of procedures performed by Dr. Jacek Zajac, MD for Medicare patients.

doctor visit	811
hospital care	430
inpatient care	430
preventive care	38
vaccines	38

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Jacek Zajac, MD.

**Gender**
Male	238
Female	269

**Ethnicity**
Non-Hispanic White	419
Black	18
Hispanic	20
Asian	33
Other	17
Native American	0

**Age**
From 65 to 74	254
From 75 to 84	157
85 and over	60
Less than 65	36

Conditions of Medicare patients treated by Dr. Jacek Zajac, MD in 2020

Hypertension	75
High Cholesterol	72
Stroke	4
Ischemic Heart Disease	47
Depression	21
Chronic Kidney Disease	49
Asthma	5
Osteoperosis	10
Atrial Fibrilation	13
Heart Failure	24
Chronic Obstructive Pulmonary Disease	13
Diabetes	63
Dementia	12
Cancer	11

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Jacek Zajac, MD treated as an endocrinologist in Lombard, IL during 2021 were hospital care, inpatient care and chronic care.

Volume of procedures performed by Dr. Jacek Zajac, MD for Medicare patients.

chronic care	63
doctor visit	826
hospital care	681
inpatient care	681

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Jacek Zajac, MD.

**Gender**
Male	228
Female	288

**Ethnicity**
Non-Hispanic White	431
Black	18
Hispanic	20
Asian	31
Other	16
Native American	0

**Age**
From 65 to 74	225
From 75 to 84	183
85 and over	68
Less than 65	40

Conditions of Medicare patients treated by Dr. Jacek Zajac, MD in 2021

Hypertension	75
High Cholesterol	75
Stroke	6
Ischemic Heart Disease	51
Depression	20
Chronic Kidney Disease	53
Asthma	8
Osteoperosis	13
Atrial Fibrilation	17
Heart Failure	28
Chronic Obstructive Pulmonary Disease	16
Diabetes	64
Dementia	14
Cancer	12

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Jacek Zajac, MD treated as an endocrinologist in Lombard, IL during 2022 were hospital care and inpatient care.

Volume of procedures performed by Dr. Jacek Zajac, MD for Medicare patients.

doctor visit	786
hospital care	485
inpatient care	485

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Jacek Zajac, MD.

**Gender**
Male	217
Female	272

**Ethnicity**
Non-Hispanic White	406
Black	0
Hispanic	0
Asian	39
Other	20
Native American	0

**Age**
From 65 to 74	224
From 75 to 84	184
85 and over	62
Less than 65	19

Conditions of Medicare patients treated by Dr. Jacek Zajac, MD in 2022

Hypertension	75
High Cholesterol	75
Stroke	8
Ischemic Heart Disease	44
Depression	16
Chronic Kidney Disease	35
Asthma	9
Osteoperosis	18
Atrial Fibrilation	26
Heart Failure	22
Chronic Obstructive Pulmonary Disease	16
Diabetes	62
Dementia	9
Cancer	15

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2022

Volume of procedures performed by Dr. Jacek Zajac, MD for Medicare patients.

The highest averages for the top procedures that Dr. Jacek Zajac, MD treated as an endocrinologist in Lombard, IL were hospital care, inpatient care, chronic care and preventive care.

chronic care	63
doctor visit	889
hospital care	637
inpatient care	632
outpatient care	14
preventive care	57
vaccines	57

Average Medicare Patient Data From 2012 - 2022

Information about Medicare patients treated by Dr. Jacek Zajac, MD.

**Gender**
Male	213
Female	304

**Ethnicity**
Black / African American	13
Asian / Pacific Islander	38
Non-Hispanic White	427
Native American / Alaskan Native	0
Hispanic	18
Other	13

**Age**
75 to 84	174
85 and over	66
Less than 65	42
65 to 74	235

Average of Total of Conditions of Medicare patients treated by Dr. Jacek Zajac, MD From 2012 - 2022

The highest averages of the most common conditions of Medicare patients that Dr. Jacek Zajac, MD treated were hypertension, high cholesterol, diabetes and ischemic heart disease.

Hypertension	68
High Cholesterol	64
Stroke	5
Ischemic Heart Disease	42
Depression	18
Chronic Kidney Disease	38
Asthma	9
Osteoporosis	11
Heart Failure	23
Chronic Obstructive Pulmonary Disease	16
Diabetes	56
Atrial Fibrillation	15
Dementia	11
Cancer	10

Education & Training

Dr. Jacek Zajac, MD graduated from Jagiellonian University Medical College in 1991. He completed residency at Maimonides Medical Center. He is certified by the American Board of Internal Medicine, Endocrinology, Diabetes and Metabolism American Board of Internal Medicine and has a state license in Illinois.

Medical School: Jagiellonian University Medical College (1991)

Residency: Maimonides Medical Center (2000)

Board Certification: American Board of Internal Medicine, Endocrinology, Diabetes and Metabolism American Board of Internal Medicine

Licensed In: Illinois

Affiliations & Hospitals

Dr. Jacek Zajac, MD is associated with these hospitals and organizations:

Endeavor Health

Advocate Health Care

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. Jacek Zajac, MD appears to accept the following insurance providers: CIGNA Choice Fund PPO, United Healthcare Select Plus POS, United Healthcare Select HMO, United Healthcare Select EPO, United Healthcare Options PPO, United Healthcare Indemnity, Aetna POS, Aetna QPOS, TRICARE Prime, Aetna Open Choice PPO, Aetna Open Access HMO, Aetna Medicare HMO, Golden Rule, TRICARE, Coventry, Aetna Open Access Aetna Select, Aetna Select, Aetna EPO, Aetna HMO, Blue Advantage PPO, Aetna Medicare PPO, United Healthcare Select Plus HMO, United Healthcare Choice Plus PPO, AARP, Medicare Advantage, Humana Medicare Choice PPO, United Healthcare Choice Plus HMO, Blue Cross PPO, Blue Advantage HMO, Blue Cross Medicare Advantage PPO, Coventry PPO, United Healthcare, Medicaid, Humana, Cigna, United Healthcare Navigate HMO, First Health, HealthLink PPO, HFN EPO, HFN PPO, HFN Platinum EPO, HFN, PHCS PPO, MultiPlan PPO, SEIU - Local 4 PPO, Union Medical (Local 1546) HMO, Aetna Medicare Prime HMO-POS, Union Medical Care PPO, Aetna Elect Choice HMO (includes Aetna Health Funds), AAH UMR Select - Team Member Plan, Aetna Medicare POS, Aetna State of Illinois Open Access Plus, Aetna Open Choice POS, Health Services and Technology, HST Care Connect PPO, Aetna Open Choice PPO - State of Illinois - SOI, United Surest (previously Bind), Aetna Managed Choice (MC) POS, Union Health Services, Inc., Aetna Open Choice POS II, Aetna State of Illinois PPO, Aetna Health Network Option, Health Services and Technology, HST Care Connect EPO, AAH UMR Preferred - Team Member Plan, Aetna Signature Administrators PPO (ASA or SRC) PPO, Aetna Upfront Advantage, Aetna Signature Administrators PPO, SEIU - Local 4 HMO, Aetna Open Access Elect Choice (includes Aetna Health Funds), Aetna NAP - PPO, Aetna Value Performance Network, Aetna Premier Care Plus Network, Blue Cross Community MMAI, BlueCare Direct HMO, Aetna Health Network Only, Aetna Premier Care Network, Blue Cross Medicare Supplement PPO and SIHO PPO.

Insurance Accepted by Provider includes:

According to our sources, Dr. Jacek Zajac, MD accepts the following insurance providers:

CIGNA Choice Fund PPO

United Healthcare Select Plus POS

United Healthcare Select HMO

United Healthcare Select EPO

United Healthcare Options PPO

United Healthcare Indemnity

Aetna POS

Aetna QPOS

TRICARE Prime

Aetna Open Choice PPO

Aetna Open Access HMO

Aetna Medicare HMO

Golden Rule

TRICARE

Coventry

Aetna Open Access Aetna Select

Aetna Select

Aetna EPO

Aetna HMO

Blue Advantage PPO

Aetna Medicare PPO

United Healthcare Select Plus HMO

United Healthcare Choice Plus PPO

AARP

Medicare Advantage

Humana Medicare Choice PPO

United Healthcare Choice Plus HMO

Blue Cross PPO

Blue Advantage HMO

Blue Cross Medicare Advantage PPO

Coventry PPO

United Healthcare

Medicaid

Humana

Cigna

United Healthcare Navigate HMO

First Health

HealthLink PPO

HFN EPO

HFN PPO

HFN Platinum EPO

HFN

PHCS PPO

MultiPlan PPO

SEIU - Local 4 PPO

Union Medical (Local 1546) HMO

Aetna Medicare Prime HMO-POS

Union Medical Care PPO

Aetna Elect Choice HMO (includes Aetna Health Funds)

AAH UMR Select - Team Member Plan

Aetna Medicare POS

Aetna State of Illinois Open Access Plus

Aetna Open Choice POS

Health Services and Technology, HST Care Connect PPO

Aetna Open Choice PPO - State of Illinois - SOI

United Surest (previously Bind)

Aetna Managed Choice (MC) POS

Union Health Services, Inc.

Aetna Open Choice POS II

Aetna State of Illinois PPO

Aetna Health Network Option

Health Services and Technology, HST Care Connect EPO

AAH UMR Preferred - Team Member Plan

Aetna Signature Administrators PPO (ASA or SRC) PPO

Aetna Upfront Advantage

Aetna Signature Administrators PPO

SEIU - Local 4 HMO

Aetna Open Access Elect Choice (includes Aetna Health Funds)

Aetna NAP - PPO

Aetna Value Performance Network

Aetna Premier Care Plus Network

Blue Cross Community MMAI

BlueCare Direct HMO

Aetna Health Network Only

Aetna Premier Care Network

Blue Cross Medicare Supplement PPO

SIHO PPO

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General Payments

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

**Payments by Company**
Lilly USA, LLC	$3,467 JARDIANCE $788	TRULICITY $615	MOUNJARO $574	FORTEO $341	BASAGLAR $244	Other $904
AstraZeneca Pharmaceuticals LP	$3,355 FARXIGA $2,590	BYDUREON PEN $273	BYDUREON $260	CRESTOR $133	SYMBICORT $29	Other $71
Novo Nordisk Inc	$2,521 Ozempic $974	Tresiba $453	RYBELSUS $372	Saxenda $283	Victoza $123	Other $317
SANOFI-AVENTIS U.S. LLC	$2,077 TOUJEO $937	SOLIQUA 100/33 $318	PRALUENT $279	LANTUS $186	TZIELD $154	Other $203
MannKind Corporation	$1,991 AFREZZA $1,991
Other	$16,012 Korlym $1,143	Vascepa $1,061	INVOKANA $910	DEXCOM G6 TRANSMITTER $708	JARDIANCE $549	Other $11,641

**Types of Payments**
Food and Beverage	$29,071
Education	$292
Gift	$59

Biography

Dr. Jacek Zajac is an adult endocrinology specialist in Lombard, IL. These areas are among Dr. Zajac's clinical interests: obesity, diabetes, and thyroid problems. He is professionally affiliated with Advocate Good Samaritan Hospital, Endeavor Health, and Advocate Illinois Masonic Medical Center. He usually is in-network for Aetna EPO, Blue California, and Coventry, as well as other insurance carriers. He is a graduate of Jagiellonian University Medical College and a graduate of Maimonides Medical Center's residency program. In addition to English, Dr. Zajac (or staff) speaks Polish and Russian.