M. Mazen Jamal, M.D., M.P.H.
NPI 1003916727 · Gastroenterology Physician · Corona, CA
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
M. Mazen Jamal, M.D., M.P.H. is a Gastroenterology Physician provider in Corona, CA (NPI 1003916727).
Provider details
- NPI number
- 1003916727
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D., M.P.H.
- Sex
- Male
- Sole proprietor
- No
- License
- 12734 (NV)
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 tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
1,921 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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 | 562 | $120 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 295 | $133 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 272 | $177 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 202 | $174 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 182 | $79 |
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 6 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Pantoprazole Sodium | 320 | 164 |
| Sodium, Potassium,mag Sulfatesbrand: Sod Sulf-Potass Sulf-Mag Sulf | 51 | 50 |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-G | 44 | 42 |
| Linaclotidebrand: Linzess | 32 | 14 |
| Famotidine | 25 | 13 |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Peg-3350 and Electrolytes | 13 | 12 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they include cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means , never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$273 across 11 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (1)
- 1810 Fullerton Ave Ste 203Corona, CA 92881-3109Phone: (951) 934-0505Fax: (951) 934-0506
Registry dates
- Enumerated
- 2006-09-23
- Last updated
- 2021-06-24
- Certified
- 2021-06-24
Frequently asked questions
- What is M. Mazen Jamal's NPI number?
- M. Mazen Jamal's National Provider Identifier (NPI) is 1003916727, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is M. Mazen Jamal's specialty?
- M. Mazen Jamal is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is M. Mazen Jamal located?
- M. Mazen Jamal's practice location on file with NPPES is 2097 Compton Ave Ste 103, Corona, CA 92881-7289.
- What is M. Mazen Jamal's phone number?
- The practice phone number listed in the NPPES registry for M. Mazen Jamal is (951) 934-0505.
- Does M. Mazen Jamal accept Medicare?
- M. Mazen Jamal is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is M. Mazen Jamal's NPI active?
- Yes — M. Mazen Jamal's NPI (1003916727) is active in the NPPES registry as of the last update on 2021-06-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.