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Dr. Jacek Zajac, MD

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Specializes in: Adult Endocrinology

Professional interests include: abnormal uterine bleeding, diabetes, obesity, 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. Dr. Jacek Zajac, MD is affiliated with Edward-Elmhurst Health, Advocate Health Care, Advocate Illinois Masonic Medical Center, Advocate Good Samaritan Hospital, Endocrinology Associates, SC and ENDOCRINOLOGY ASSOCIATES SC.

Office Locations

Address:

2500 S. Highland Avenue Suite 104
Lombard, IL 60148

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.

doctor visit	877
hospital care	944
inpatient care	931
outpatient care	13
preventive care	53
vaccines	53

**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

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

doctor visit	913
hospital care	728
inpatient care	711
outpatient care	17
preventive care	83
vaccines	83

**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

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

doctor visit	825
hospital care	608
inpatient care	609
preventive care	75
vaccines	75

**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

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

doctor visit	942
hospital care	708
inpatient care	709
preventive care	51
vaccines	51

**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

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

doctor visit	969
hospital care	601
inpatient care	591
outpatient care	10
preventive care	47
vaccines	47

**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

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

doctor visit	940
hospital care	449
inpatient care	450
preventive care	47
vaccines	47

**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

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

doctor visit	1021
hospital care	493
inpatient care	481
outpatient care	12
preventive care	54
vaccines	54

**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

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

doctor visit	806
hospital care	428
inpatient care	429
preventive care	34
vaccines	34

**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

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

Average Medicare Procedure Volume From 2013 - 2021

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	62
doctor visit	990
hospital care	680
inpatient care	675
outpatient care	13
preventive care	57
vaccines	57

Average Medicare Patient Data From 2013 - 2021

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

**Gender**
Male	190
Female	278

**Ethnicity**
Black / African American	13
Asian / Pacific Islander	35
Non-Hispanic White	386
Native American / Alaskan Native	0
Hispanic	18
Other	11

**Age**
75 to 84	155
85 and over	59
Less than 65	40
65 to 74	213

Average of Total of Conditions of Medicare patients treated by Dr. Jacek Zajac, MD From 2013 - 2021

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	60
High Cholesterol	56
Stroke	4
Ischemic Heart Disease	37
Depression	16
Chronic Kidney Disease	33
Asthma	8
Osteoporosis	9
Heart Failure	20
Chronic Obstructive Pulmonary Disease	14
Diabetes	49
Atrial Fibrillation	12
Cancer	8
Dementia	10

Education & Training

He completed residency at Maimonides Medical Center. He is certified by the Endocrinology, Diabetes and Metabolism and has a state license in Illinois.

Residency: Maimonides Medical Center

Board Certification: Endocrinology, Diabetes and Metabolism

Licensed In: Illinois

Affiliations & Hospitals

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

Edward-Elmhurst Health

Advocate Health Care

Advocate Illinois Masonic Medical Center

Advocate Good Samaritan Hospital

Endocrinology Associates, SC

ENDOCRINOLOGY ASSOCIATES SC

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: HFN, Blue Advantage PPO, Humana PPO, Aetna Medicare PPO, PHCS PPO, United Healthcare Choice Plus PPO, Aetna Choice POS II, Medicare Advantage, MultiPlan PPO, Blue Cross PPO, AARP, CIGNA Choice Fund PPO, Blue Advantage HMO, Blue Cross Medicare Advantage PPO, United Healthcare Select Plus POS, Coventry PPO, United Healthcare Options PPO, United Healthcare Indemnity, Humana National POS - Open Access, United Healthcare Choice Plus POS, Humana HMO, Aetna, Humana HMO Premier, Unicare PPO, Golden Rule, Humana Platinum HMO, TRICARE Prime, Aetna POS, Aetna QPOS, United Healthcare, Aetna Open Choice PPO, Aetna Open Access HMO, Humana, Cigna, Community Care Network (CCN), TRICARE, Coventry, Aetna Open Access Aetna Select, Aetna Select, Humana National HMO, Humana National EPO, HealthLink PPO, Aetna Choice POS, United Healthcare Navigate HMO, Aetna EPO, First Health, Humana ChoiceCare PPO, Aetna PPO, HFN EPO, Aetna HMO, HFN PPO, HFN Platinum EPO, Union Health Services, Inc., HST Care Connect PPO, Blue Cross Medicare Supplement PPO, United Surest (previously Bind), Blue Cross Community MMAI, Health Alliance Employee EPO, AAH UMR Select - Team Member Plan, HST Care Connect EPO, SEIU - Local 4 HMO, Meridian, SEIU - Local 4 PPO, Union Medical Care PPO, Blue Precision HMO, Union Medical (Local 1546) HMO, BlueCare Direct HMO, Blue Cross HMO Illinois and AAH UMR Preferred - Team Member Plan.

Insurance Accepted by Provider includes:

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

HFN

Blue Advantage PPO

Humana PPO

Aetna Medicare PPO

PHCS PPO

United Healthcare Choice Plus PPO

Aetna Choice POS II

Medicare Advantage

MultiPlan PPO

Blue Cross PPO

AARP

CIGNA Choice Fund PPO

Blue Advantage HMO

Blue Cross Medicare Advantage PPO

United Healthcare Select Plus POS

Coventry PPO

United Healthcare Options PPO

United Healthcare Indemnity

Humana National POS - Open Access

United Healthcare Choice Plus POS

Humana HMO

Aetna

Humana HMO Premier

Unicare PPO

Golden Rule

Humana Platinum HMO

TRICARE Prime

Aetna POS

Aetna QPOS

United Healthcare

Aetna Open Choice PPO

Aetna Open Access HMO

Humana

Cigna

Community Care Network (CCN)

TRICARE

Coventry

Aetna Open Access Aetna Select

Aetna Select

Humana National HMO

Humana National EPO

HealthLink PPO

Aetna Choice POS

United Healthcare Navigate HMO

Aetna EPO

First Health

Humana ChoiceCare PPO

Aetna PPO

HFN EPO

Aetna HMO

HFN PPO

HFN Platinum EPO

Union Health Services, Inc.

HST Care Connect PPO

Blue Cross Medicare Supplement PPO

United Surest (previously Bind)

Blue Cross Community MMAI

Health Alliance Employee EPO

AAH UMR Select - Team Member Plan

HST Care Connect EPO

SEIU - Local 4 HMO

Meridian

SEIU - Local 4 PPO

Union Medical Care PPO

Blue Precision HMO

Union Medical (Local 1546) HMO

BlueCare Direct HMO

Blue Cross HMO Illinois

AAH UMR Preferred - Team Member Plan

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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 a specialist in adult endocrinology. Dr. Zajac (or staff) speaks the following languages: Polish and Russian. His areas of expertise include the following: obesity, diabetes, and calcium metabolism disorder. He is professionally affiliated with Edward-Elmhurst Health, Advocate Health Care, and Elmhurst Hospital. His medical residency was performed at Maimonides Medical Center. Aetna EPO, Blue California, and Coventry appears to be the insurance carriers that Dr. Zajac takes.