Daniel J Grzegorek, D.O.
Daniel J Grzegorek is an Internal Medicine specialist based in Willowbrook, IL with over 34 years of clinical experience. Medicare-enrolled per CMS records and offers virtual telehealth visits.
Daniel J Grzegorek, D.O. has practiced internal medicine for 34+ years, working in group practice. He graduated from Chicago College of Osteopathy in 1992 and has 34+ years of clinical experience. Among his Medicare patients, common conditions include hypertension, high cholesterol, and arthritis (per CMS data).
At a glance
- Prescribes opioids less than 40% of reporting doctors in Illinois
- Uses generic medications more than 63% of reporting doctors in Illinois
- Virtual visits available — no app or travel required
Older · 1019dNPPES updated 2023-08-08 · verify NPI on CMS · Verify license at Illinois Department of Financial & Professional Regulation — Medical
How Does This Doctor Compare?
Based on Medicare data, this doctor prescribes opioid pain medications conservatively, favors affordable generic drugs over brand-name ones.
Opioid Rx
↓ Lower = better1.45%
Illinois avg: 4.5 · US avg: 5.1
✓ Higher than most doctors nationally(-3.6 pts)
Typical range among reporting doctors in Illinois1.45% of this doctor's prescriptions are opioid pain medications. Lower means more cautious prescribing.
Generic Rx
↑ Higher = better90%
Illinois avg: 82.9 · US avg: 82.8
✓ Higher than most doctors nationally(+7.2 pts)
Typical range among reporting doctors in IllinoisHow often this doctor prescribes affordable generic drugs instead of expensive brand-name ones.
Medicare Patients
732
Unique beneficiaries
High volumePrescription Recipients
774
Patients prescribed
Prescriptions Written
10,643
Total claims
Total Medicare drug cost: $615k
Percentile rankings compared against 2,844 reporting peers in Illinois.
Data Note: Sourced from CMS Medicare Provider Utilization & Payment Data. Percentile rankings compare this provider against all peers with reported data in the same state. Updated annually to reflect the latest federal reporting cycle.
What This Doctor Treats Most
Based on Medicare claims data — here's what patients commonly see this doctor for
Based on Medicare data, this doctor primarily manages Hypertension, High Cholesterol, and Arthritis.
High blood pressure — a leading risk factor for heart disease and stroke
US avg: 70.2%↑ More patients than average (+5%) — a focus area for this doctor
Elevated cholesterol or triglycerides that increase heart disease risk
US avg: 70.4%↑ More patients than average (+5%) — a focus area for this doctor
Joint inflammation causing pain, swelling, and stiffness
US avg: 49.3%↑ More patients than average (+6%) — a focus area for this doctor
Gradual loss of kidney function over time, often linked to diabetes or hypertension
US avg: 29.6%↑ More patients than average (+8%) — a focus area for this doctor
Reduced blood flow to the heart muscle, commonly known as coronary artery disease
US avg: 31.7%↑ More patients than average (+6%) — a focus area for this doctor
Conditions affecting emotional state, including depression and bipolar disorder
A condition where the body cannot properly regulate blood sugar levels
US avg: 34.5%↓ Fewer patients than average (-3%) — less common here
The heart cannot pump blood efficiently enough to meet the body's needs
US avg: 22.5%↑ More patients than average (+9%) — a focus area for this doctor
Percentage of this provider's Medicare patients diagnosed with each condition. Source: CMS Utilization Data.
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Background & Specialty
Education, training, and specialty classification from CMS NPPES and Medicare records.
Graduated medical school · 1992
Chicago College of Osteopathy
Board certified · Aug 7, 2023
Self-reported via NPPES
34 years in practice
Senior practitioner
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
Taxonomy: 207R00000X
Education & Training
Chicago College of Osteopathy (Class of 1992)
Mailing address
Po Box 713260, Chicago, IL 60677-1260
Differs from practice location
Virtual Internal Medicine Care With Daniel J Grzegorek
NPPES records indicate this provider offers telehealth services. Contact the office to confirm availability and scheduling.
Schedule a virtual visit with Daniel J Grzegorek for blood pressure monitoring, cholesterol management, arthritis follow-ups — no travel to Willowbrook required. The office sends a secure video link before your appointment. Most visits take 15–30 minutes. Medicare enrolled per CMS records.
Frequently Asked Questions
Common questions about Daniel J Grzegorek
Dr. Grzegorek is listed as active in the NPI registry with telehealth listed in Willowbrook, IL. NPI status alone doesn't confirm open availability — call the office to confirm. Phone: (630) 325-4049.
Sourced from CMS NPPES · OIG LEIE · CMS Medicare Part D · CMS Physician Comparator. See Data Methodology.
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Contact Daniel J Grzegorek
Practice Location
6733 Kingery Hwy, Willowbrook, IL 60527-5142
Mailing Address
Po Box 713260, Chicago, IL 60677-1260
This is a provider directory. Contact the office directly to schedule appointments.
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