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JACEK ZAJAC M.D.
NPI 1396817912
Internal Medicine - Endocrinology, Diabetes & Metabolism in Lombard, IL

Active since November 15, 2006PECOS EnrolledAccepts Medicare Assignment
2500 S HIGHLAND AVE, STE 104, LOMBARD, IL 60148(630) 629-3610(630) 629-4878 Get Directions Write a Review

NPPES record last updated: February 20, 2024. Verified against the NPPES registry weekly; last sync: August 16, 2026.

About Jacek Zajac M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

JACEK ZAJAC M.D. (NPI 1396817912) is an individual endocrinology, diabetes & metabolism provider in Lombard, Illinois, licensed in Illinois (361-07774) and active in the NPI registry since November 2006. He is enrolled in Medicare PECOS, is affiliated with Advocate Illinois Masonic Medical Center, and is a graduate of Other (1991).

NPPES Registry Identity

NPI1396817912
Entity TypeIndividualMale
Primary Taxonomy207RE0101X
Provider Legal NameJACEK ZAJACCredential: M.D.
Location Address2500 S HIGHLAND AVE, STE 104Lombard, IL 60148-5381
Mailing Address2500 S Highland Ave, Ste 104Lombard, IL 60148-5381 · (630) 629-3610 · Fax (630) 629-4878
Phone(630) 629-3610
Fax(630) 629-4878
Sole ProprietorNo
Medical School CMSOtherGraduated 1991
Enumeration DateNovember 15, 2006
Last NPPES UpdateFebruary 20, 2024
NPPES CertifiedFebruary 20, 2024
✔ NPI 1396817912 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Endocrinology, Diabetes & MetabolismAllopathic & Osteopathic Physicians
Taxonomy Code207RE0101X
License✔ Licensed in IL · 361-07774
Definition
An internist who concentrates on disorders of the internal (endocrine) glands such as the thyroid and adrenal glands. This specialist also deals with disorders such as diabetes, metabolic and nutritional disorders, obesity, pituitary diseases and menstrual and sexual problems.
2500 S HIGHLAND AVE, Lombard, IL 60148
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Jacek Zajac M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID7618998873
PECOS Enrollment IDI20051215000606
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Areas of Expertise CMS Part B claims 9

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
555 services292 patients
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232
Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.
361 services72 patients
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
100 services88 patients
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223
Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.
57 services50 patients
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes 99222
Initial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.
33 services31 patients
New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more 99205
This is a first-time patient visit where a healthcare professional spends 60-74 minutes with you. It involves a comprehensive evaluation, including your medical history and current health condition. They'll also advise on preventive health measures and formulate a treatment plan if needed.
22 services22 patients

Hospital Affiliations CMS Care Compare 5

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Advocate Illinois Masonic Medical Center

Acute Care Hospitals · Chicago, IL
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number140182
Location836 West Wellington AvenueChicago, IL 60657 · Cook County
Emergency services Birthing friendly

Elmhurst Memorial Hospital

Acute Care Hospitals · Elmhurst, IL
4/5 CMS rating
OwnershipProprietary
CMS Certification Number140200
Location155 East Brush Hill RoadElmhurst, IL 60126 · Du Page County
Emergency services Birthing friendly

Edward Hospital

Acute Care Hospitals · Naperville, IL
5/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number140231
Location801 South WashingtonNaperville, IL 60540 · Du Page County
Emergency services Birthing friendly

Loyola University Medical Center

Acute Care Hospitals · Maywood, IL
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number140276
Location2160 S 1st AvenueMaywood, IL 60153 · Cook County
Emergency services Birthing friendly

Advocate Good Samaritan Hospital

Acute Care Hospitals · Downers Grove, IL
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number140288
Location3815 Highland AvenueDowners Grove, IL 60515 · Du Page County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60148 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$137.43 typical visit price
range $59.81 – $181.38
Typical copayment $34.35 (range $14.95 – $45.34)
Most-billed visit code 99204
Established Patient
$105.07 typical visit price
range $19.15 – $147.12
Typical copayment $26.26 (range $4.78 – $36.78)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Referred Medical Equipment & Supplies CMS DME claims 9

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Supplies for maintenance of insulin infusion catheter, per week A4224
DME-Other DME · category DE017N
4 suppliers38 claims471 services$18.26 avg. paid by Medicare
Supplies for external insulin infusion pump, syringe type cartridge, sterile, each A4225
DME-Other DME · category DE017N
4 suppliers34 claims1,040 services$2.23 avg. paid by Medicare
Supply allowance for adjunctive continuous glucose monitor (cgm), includes all supplies and accessories, 1 month supply = 1 unit of service A4238
DME-Medical/Surgical Supplies · category DA000N
4 suppliers29 claims29 services$164.48 avg. paid by Medicare
Blood glucose test or reagent strips for home blood glucose monitor, per 50 strips A4253
DME-Other DME · category DE017N
53 suppliers162 claims718 services$5.92 avg. paid by Medicare
Lancets, per box of 100 A4259
DME-Medical/Surgical Supplies · category DA000N
20 suppliers49 claims98 services$0.96 avg. paid by Medicare
External ambulatory infusion pump, insulin E0784
DME-Other DME · category DE017N
4 suppliers42 claims42 services$298.16 avg. paid by Medicare
Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES 13

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

LEON L CHEN O.M.D., L.AC.
Acupuncturist
2500 S HIGHLAND AVE, SUITE 342
LOMBARD, IL 60148
Dupage County (630) 916-0781
PRIMARY CARE SERVICES
Internal Medicine
2500 S HIGHLAND AVE, SUITE 230
LOMBARD, IL 60148
Dupage County (630) 429-9000
CENTER FOR DERMATOLOGY AND SKIN CANCER LTD
Dermatology (MOHS-Micrographic Surgery)
2500 S HIGHLAND AVE, SUITE 200
LOMBARD, IL 60148
Dupage County (630) 964-2000
MEGHAN FLYNN COLAN MS CCC-SLP
Speech-Language Pathologist
2500 S HIGHLAND AVE, SUITE 330
LOMBARD, IL 60148
Dupage County (847) 749-3397
DR. ABID KHURSHID M.D.
Internal Medicine (Pulmonary Disease)
2500 S HIGHLAND AVE, SUITE 325
LOMBARD, IL 60148
Dupage County (630) 495-9810
NHG SERVICES, INC
General Practice
2500 S HIGHLAND AVE
LOMBARD, IL 60148
Dupage County (630) 326-6071
APRIL ROSE DIFATTA LCPILL
Counselor (Professional)
2500 S HIGHLAND AVE
LOMBARD, IL 60148
Dupage County (630) 728-1744
DR. ROBERT VINCENT KOLBUSZ M.D.
Dermatology (MOHS-Micrographic Surgery)
2500 S HIGHLAND AVE
LOMBARD, IL 60148
Dupage County (630) 964-2000

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Jacek Zajac's NPI number?

The NPI number for Jacek Zajac is 1396817912. It was assigned to this individual provider in the NPPES registry on November 15, 2006.

Where is Jacek Zajac located?

Jacek Zajac practices at 2500 S Highland Ave Ste 104, Lombard, IL 60148. The listed phone number is (630) 629-3610.

What is Jacek Zajac's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Endocrinology, Diabetes & Metabolism, with taxonomy code 207RE0101X.

Is Jacek Zajac enrolled in Medicare?

Yes. Jacek Zajac is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Is Jacek Zajac affiliated with any hospitals?

According to CMS data, Jacek Zajac is affiliated with Advocate Illinois Masonic Medical Center, Elmhurst Memorial Hospital, Edward Hospital, Loyola University Medical Center and Advocate Good Samaritan Hospital.

When was this NPI record last updated?

The NPPES record for Jacek Zajac was last updated on February 20, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.