Mazin Fattouhi, M.D.
NPI 1639519309 · Internal Medicine Physician · Long Grove, IL
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mazin Fattouhi, M.D. is a Internal Medicine Physician provider in Long Grove, IL (NPI 1639519309).
Provider details
- NPI number
- 1639519309
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 036139567 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
13 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
9,965 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 6,658 | $121 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 1,606 | $116 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 1,173 | $177 |
| Hospital Discharge Day Management, 30 Minutes Or Less99238 | 302 | $82 |
| Initial Hospital Care With Same-Day Admission and Discharge With High Level of Medical Decision Making, Per Day, If Using Time, at Least 85 Minutes99236 | 88 | $212 |
| New Patient Office Or Other Outpatient Visit With a High Level of Medical Decision Making, If Using Time, 60 Minutes Or More99205 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 18 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amlodipine Besylate | 34 | 28 |
| Pantoprazole Sodium | 26 | 26 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 24 | 24 |
| Furosemide | 24 | 24 |
| Prednisone | 24 | 24 |
| Cefuroxime Axetilbrand: Cefuroxime | 19 | 19 |
| Potassium Chloride |
Practice location
Mailing address
Registry dates
- Enumerated
- 2013-06-26
- Last updated
- 2023-03-07
- Certified
- 2021-12-19
Frequently asked questions
- What is Mazin Fattouhi's NPI number?
- Mazin Fattouhi's National Provider Identifier (NPI) is 1639519309, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mazin Fattouhi's specialty?
- Mazin Fattouhi is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mazin Fattouhi located?
- Mazin Fattouhi's practice location on file with NPPES is 3880 Salem Lake Dr, Long Grove, IL 60047-5292.
- What is Mazin Fattouhi's phone number?
- The practice phone number listed in the NPPES registry for Mazin Fattouhi is (847) 719-2220.
- Does Mazin Fattouhi accept Medicare?
- Mazin Fattouhi is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mazin Fattouhi's NPI active?
- Yes — Mazin Fattouhi's NPI (1639519309) is active in the NPPES registry as of the last update on 2023-03-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.