NPI registry status
Active
2026 NPPES data Medical Toxicology (Emergency Medicine) Physician NPI 1134436819 M.D.
Verify on CMS → Mazen Diab, M.D.
Medical Toxicology (Emergency Medicine) Physician in Tinley Park, Illinois.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 239 in Medical Toxicology (Emergency Medicine) Physician, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
684
Medicare Part D claims · 162 beneficiaries · Medical Toxicology (Emergency Medicine) Physician avg: 244
What the federal data shows
Mazen Diab, M.D. filed 684 Medicare Part D claims in 2024 as a Medical Toxicology (Emergency Medicine) Physician in Tinley Park, Illinois.
- 684
- Part D claims, 2024
- Likely
- board-certified (heuristic)
- ≥68th
- pct by Part D claim volume (lower-bound band)
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
Federal trust snapshot
What official records show about Mazen Diab, M.D.
Federal records show an active NPI with Medicare Part D prescribing activity — verifiable registry data, not a proprietary rating.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1134436819), first enumerated 09/02/2010.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 684 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
Board certification signal
Heuristic suggests board-certified status based on ABMS-eligible specialty taxonomy plus active CMS participation signals — not a direct ABMS verification.
- Reported
Hospital affiliations
1 CMS Care Compare hospital affiliation on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- State context
State board disciplinary context
Illinois statewide board action statistics are published annually — these figures describe aggregate state activity, not Mazen Diab, M.D.'s individual license status. Verify directly with the state medical board.
Source: IDFPR annual report 2023
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1134436819 · Medical Toxicology (Emergency Medicine) Physician
NPI-10 · ENUM-MID · TAX-TRACE · RX-LIGHT · BOOK-THIN · PHOTO-ENUM
- NPI-10 1134436819
- ENUM-MID 2010
- TAX-TRACE 239
- RX-LIGHT 684
- BOOK-THIN 13 in Illinois
- PHOTO-ENUM Sonya Kim, M.D., MBA · 2010
Mazen Diab, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
684 ≥ 68th percentile 68% of 1,416,883 prescribers are in lower value bands
Each bar is a band; taller bars hold more prescribers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2024
✓
Board certification likely (heuristic, not verified)
Mazen Diab, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 1 hospital affiliation - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Mazen Diab, M.D.?
Quality data not reportedPrimary specialty
Medical Toxicology (Emergency Medicine) Physician
Medicare Part D claims
684 180% vs specialty avg
Specialty distribution in Illinois
How Medical Toxicology (Emergency Medicine) Physician compares to other specialties among Illinois providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Medical Toxicology (Emergency Medicine) Physician. Verify directly:
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Practice Address
Provider Details
| NPI | 1134436819 |
|---|---|
| Specialty | Medical Toxicology (Emergency Medicine) Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 09/02/2010 |
Hospital and facility affiliations
Facilities where Mazen Diab, M.D. bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.
Kidney And Hypertension Associates Ltd
Chicago, IL
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
License & disciplinary context - Illinois IDFPR 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~42K Illinois medical licensees in 2023 - they are NOT specific to Mazen Diab, M.D.. To verify Mazen Diab, M.D.'s current license status, search the IDFPR public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
106
Total board actions, Illinois 2023
Across 103 cases
2.52
Actions per 1,000 licensees
Illinois statewide rate
probation
Most common action type
38 cases
IDFPR publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the Illinois disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2024.
684
Total Claims
$32K
Total Drug Cost
162
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,025.567
- Total Day Supply
- 29,650
- Generic Drug Cost
- $15K
Patient Demographics
- Average Patient Age
- 76.6 years
- Avg HCC Risk Score
- 4.85
- Gender Split
- 50% female / 50% male
- Age Distribution
- <65: 13, 65-74: 46, 75-84: 69, 85+: 34
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Mazen Diab, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2024
- Furosemide
Furosemide
95 claims
- Sevelamer Carbonate
Sevelamer Carbonate
72 claims
- Amlodipine Besylate
Amlodipine Besylate
57 claims
- Hydralazine Hcl
Hydralazine Hcl
53 claims
- Carvedilol
Carvedilol
42 claims
- Calcium Acetate 26
Calcium Acetate
26 claims
- Lokelma 21
Lokelma
21 claims
- Midodrine Hcl 20
Midodrine Hcl
20 claims
| Drug | Claims |
|---|---|
| Furosemide | 95 |
| Sevelamer Carbonate | 72 |
| Amlodipine Besylate | 57 |
| Hydralazine Hcl | 53 |
| Carvedilol | 42 |
| Calcium Acetate | 26 |
| Lokelma Sodium Zirconium Cyclosilicate | 21 |
| Midodrine Hcl | 20 |
| Torsemide | 19 |
| Bumetanide | 15 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Medical Toxicology (Emergency Medicine) Physician in IL →
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Medical Toxicology (Emergency Medicine) Physician Overview
How Mazen Diab, M.D. fits within the Medical Toxicology (Emergency Medicine) Physician landscape nationally.
239
Medical Toxicology (Emergency Medicine) Physician Providers in US
38
States with Medical Toxicology (Emergency Medicine) Physician
244
Avg Claims per Provider
Mazen Diab, M.D.'s 684 claims are above the specialty average of 244.
Nationwide Medical Toxicology (Emergency Medicine) Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Diab, both outside Illinois so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2010)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Medical Toxicology (Emergency Medicine) Physician Providers in Illinois
Other clinicians with the same primary specialty enrolled in Illinois, drawn from the same CMS NPPES roster as Diab.
One of 13 Medical Toxicology (Emergency Medicine) Physician providers enrolled in Illinois, 5 are shown here.
Frequently Asked Questions
What is Mazen Diab, M.D.'s specialty? ▼
Mazen Diab, M.D. specializes in Medical Toxicology (Emergency Medicine) Physician and practices in Tinley Park, Illinois. Credentials: M.D..
How much does Mazen Diab, M.D. prescribe under Medicare Part D? ▼
In 2024, Mazen Diab, M.D. wrote 684 Medicare Part D claims totaling $32K in drug costs for 162 beneficiaries.
Where is Mazen Diab, M.D. located? ▼
Mazen Diab, M.D. is located at 17495 LA GRANGE RD, Tinley Park, IL, 60487. Phone: (630) 873-8875.
What is Mazen Diab, M.D.'s NPI number? ▼
Mazen Diab, M.D.'s National Provider Identifier (NPI) is 1134436819, issued on 09/02/2010.
How many Medical Toxicology (Emergency Medicine) Physician providers are there in the US? ▼
There are 239 Medical Toxicology (Emergency Medicine) Physician providers across 38 states in the US. The average Medical Toxicology (Emergency Medicine) Physician provider writes 244 Medicare Part D claims per year.
What drugs does Mazen Diab, M.D. prescribe most often? ▼
Based on 2024 Medicare Part D data, Mazen Diab, M.D.'s most frequently prescribed drugs include Furosemide, Sevelamer Carbonate, Amlodipine Besylate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Mazen Diab, M.D. accept Medicare? ▼
Mazen Diab, M.D. appears in CMS Medicare data with 684 Part D claims and 162 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Mazen Diab, M.D.'s credentials? ▼
Mazen Diab, M.D.'s NPI is 1134436819 with credentials M.D.. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2024). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of August 2026 (NPPES) / 2024 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of August 2026.