Dr. Mazen Diab, MD
- Medicare services, 2024
- 2,460
- Medicare patients, 2024
- 335
- Part D claims, 2024
- 684
- Hospital affiliations
- 4
- Industry payments
- $241
- Practice address
- 3100 Theodore St, Joliet, IL 60435
- Practice phone
- Call (815) 320-3049
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Renal Center New Lenox
Joliet, Illinois
Find Dr. Diab's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Mazen Diab is a nephrologist in Joliet, Illinois
Dr. Diab practices at Renal Center New Lenox in Joliet, Illinois.
Dr. Diab's NPI, 1134436819, was assigned on September 2, 2010. Dr. Diab holds Illinois license 036-135420.
- NPI
- 1134436819NPI Registry (opens in a new tab)
- Medicare PAC ID
- 3678873114
- NPI enumeration date
- September 2, 2010
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (815) 320-3049
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 48
- Medical school graduation
- 2004
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Mazen Diab practices at Renal Center New Lenox in Joliet, Illinois
Dr. Diab's primary practice is Renal Center New Lenox, at 3100 Theodore St, Joliet, IL 60435 in Will County. The practice phone is (815) 320-3049.
- Renal Center New Lenox3100 Theodore St, Joliet, IL 60435 · Will CountyPhone(815) 320-3049
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Mazen Diab is affiliated with 11 sites of care and 4 medical groups
Dr. Diab's primary practice is Renal Center New Lenox in Joliet, Illinois. Dr. Diab is also affiliated with Saint Joseph Medical Center. The medical group on file is Dreyer Medical Clinic (Advocate Medical Group). Dmand AI also links Dr. Diab to 3 more hospitals, 3 dialysis centers, 3 group practices and clinics and 3 medical groups, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Mazen Diab's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Diab practices, 10 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Renal Center New Lenox | Available with a free account |
| +10 more sites and 3 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Mazen Diab is one of 534 nephrologists in Illinois
Nephrology is Dr. Diab's primary specialty in the NPI Registry, under taxonomy code 207RN0300X. Dmand AI has Dr. Diab's licenses on file in 2 states: Illinois and Pennsylvania.
Specialties and state licenses
- Nephrology, IllinoisPrimary
- Medical toxicology (emergency medicine), Pennsylvania
Nephrologists near Dr. Diab
Counts of nephrologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Mazen Diab billed Medicare for 2,460 services in 2024
CMS data shows 2,460 Medicare services from Dr. Diab across 14 procedure codes in 2024, for 335 Medicare patients. Medicare paid $260,929 for them.
Dr. Diab's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 2,4302024: 1,95819%
- Tests and treatments
- 2023: 5142024: 5022%
Where Dr. Diab's Medicare services took place, 2024
- In an office30012%
- In a facility2,16088%
Dr. Diab compared with the Illinois median for nephrologists, 2024
- Dr. Diab
- Illinois median
- Medicare services
- 2,460vs 1,28492% above
- Medicare patients
- 335vs 3576% below
- Part D claims
- 503vs 57813% below
Medians across 526 nephrologists in Illinois with Dmand AI profiles that report each measure.
Dr. Diab's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Diab and other nephrologists in Illinois.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Mazen Diab treated 335 Medicare patients in 2024, average age 76
CMS counts 335 Medicare patients who saw Dr. Diab in 2024. The largest group is 75 to 84, with 131 patients. 75% of them have chronic kidney disease, and 75% have high blood pressure. 24% are also on Medicaid. Their average risk score is 3.70, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Diab's median patient age at 71, with 48% women.
Dr. Diab's Medicare patients by age, 2024
Dr. Diab's Medicare patients by sex, 2024
- Women16248%
- Men17352%
Chronic conditions among Dr. Diab's Medicare patients, 2024
- Chronic kidney disease75%
- High blood pressure75%
- High cholesterol75%
- Diabetes69%
- Heart failure68%
- Ischemic heart disease62%
- Arthritis58%
- Atrial fibrillation47%
Share of Medicare patients with each condition. A patient can have several.
Dr. Diab's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 71
Patient panel by sex, all payers
- Women48%
- Men51%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Mazen Diab wrote 684 Medicare Part D claims in 2024
In 2024, Dr. Diab wrote 684 Medicare Part D claims for 162 patients. 89% of them were for generic drugs. CMS names the drug for 503 of them, across 16 drugs with 11 or more claims each, at $17,837 in total drug cost. In 2023, CMS named 430 claims across 12 drugs.
Dr. Diab's Part D claims by kind of drug, 2024
- Generic611 claims89%
- Brand-name and other73 claims11%
Dr. Diab's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 4302024: 50317%
Drugs named by CMS: 16 in 2024, 12 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Mazen Diab offers telehealth to Medicare patients
Dr. Diab accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Diab as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Mazen Diab received $241 in industry payments from 2016 to 2019
CMS Open Payments shows 3 general payments to Dr. Diab from 3 drug and device companies from 2016 to 2019. Food and beverage make up the largest share, 100% of the total. Relypsa, Inc. paid the most, $106.
General payments to Dr. Diab by program year, 2016 to 2019
Companies that paid Dr. Diab the most, 2016 to 2019
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Mazen Diab's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Mazen Diab
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Mazen Diab's NPI number?
Dr. Mazen Diab's NPI number is 1134436819. It was assigned on September 2, 2010, and it is active in the NPI Registry.
What kind of doctor is Dr. Mazen Diab?
Dr. Mazen Diab is a nephrologist in Joliet, Illinois. The primary specialty in the NPI Registry is Nephrology Physician (taxonomy code 207RN0300X).
Where does Dr. Mazen Diab practice?
Dr. Diab practices at 3100 Theodore St, Joliet, IL 60435. Dr. Diab's primary practice is Renal Center New Lenox in Joliet, Illinois. Dmand AI also links Dr. Diab to 3 hospitals, 3 dialysis centers, 3 group practices and clinics and 3 medical groups.
What is Dr. Mazen Diab's office phone number?
The practice phone on file for Dr. Diab is (815) 320-3049.
What is Dr. Mazen Diab's medical license number?
Dr. Diab holds Illinois license 036-135420, one of the licenses on file in 2 states.
Which states has Dr. Mazen Diab been licensed in?
Dmand AI has state licenses on file for Dr. Diab in Illinois and Pennsylvania.
Which hospitals is Dr. Mazen Diab affiliated with?
Dr. Diab is affiliated with Saint Joseph Medical Center. Dmand AI links Dr. Diab to 3 more hospitals.
What medical group is Dr. Mazen Diab part of?
Dr. Diab is linked to Dreyer Medical Clinic (Advocate Medical Group). Dmand AI links Dr. Diab to 3 more medical groups.
Does Dr. Mazen Diab accept Medicare?
Yes. CMS data shows Dr. Diab billed Medicare for 2,460 services in 2024, and Dr. Diab accepts Medicare assignment.
Does Dr. Mazen Diab offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Diab as offering telehealth services.
Show 5 more questionsShow fewer questions
How many Medicare patients does Dr. Mazen Diab see?
CMS counts 335 Medicare patients who saw Dr. Diab in 2024, with an average age of 76.
What services does Dr. Mazen Diab bill to Medicare?
In 2024, Dr. Diab's most billed Medicare services were hospital inpatient care (99233), dialysis (90935) and hospital inpatient care (99232).
What drugs does Dr. Mazen Diab prescribe most?
In 2024 Medicare Part D data, Dr. Diab's most prescribed drugs by claims were Furosemide, Sevelamer Carbonate and Amlodipine Besylate.
Has Dr. Mazen Diab received payments from drug or device companies?
CMS Open Payments shows $241 in general payments to Dr. Diab from 3 companies from 2016 to 2019. The largest total came from Relypsa, Inc.
How long has Dr. Mazen Diab been practicing?
Dr. Diab graduated from medical school in 2004, 22 years ago.
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