M. MAZEN JAMAL (M.D., M.P.H.) – Gastroenterology Physician, NPI 1003916727
Gastroenterology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
1,981 GASTROENTEROLOGY in CA
Provider Addresses for M. MAZEN JAMAL (M.D., M.P.H.)
1810 FULLERTON AVE STE 203
CORONA, CA 928813109
Phone: (951) 934-0505
Fax: (951) 934-0506
Type: Location
2097 COMPTON AVE STE 103
CORONA, CA 928817289
Phone: (951) 934-0505
Fax: (951) 444-7749
Type: Location
1810 Fullerton Ave Ste 203
Corona, CA 928813109
Phone: (951) 934-0505
Fax: (951) 934-0506
Type: Location
29 PRAIRE
IRVIN, CA 92618
Phone: (949) 813-5115
Fax: (949) 825-5189
Type: Mailing
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 16 Open Payments records for all available years, with a total value of $374.
Total Amount is formed as General ($374) + Research ($0) + Ownership ($0) = $374.
Last reported payment date: 2024-12-18 • Largest payer in this snapshot: ABBVIE INC. ($90).
Total Amount
$374
General + Research + Ownership
Payments
16
Total payment records
General Amount
$374
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-18
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| ABBVIE INC. | $90 |
| Janssen Biotech, Inc. | $70 |
| Ardelyx, Inc. | $60 |
| Phathom Pharmaceuticals, Inc. | $30 |
| IRONWOOD PHARMACEUTICALS, INC | $29 |
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2009-06-29
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20090629000217 | I | Gastroenterology | CA | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 99233 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 776 | 340 | $0 |
| 99223 | Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 316 | 278 | $0 |
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 288 | 194 | $0 |
| 99204 | New patient office or other outpatient visit, 45-59 minutes | 192 | 192 | $0 |
| 99232 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 148 | 86 | $0 |
Insurance plans in this area (ZIP 92881)
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Provider's Procedures
Group practice members
| Name | Specialty | State |
|---|---|---|
| G A S T R O E N T E R O L O G Y | PA |
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