Quick answers
- Does Gibran H. Mahmud accept Medicare assignment?
- Yes. Medicare's clinician data says Gibran H. Mahmud accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Gibran H. Mahmud see?
- In 2024, CMS data shows 991 Original Medicare patients and 520,600 services for Gibran H. Mahmud. This counts Original Medicare only and measures volume, not quality.
- What is Gibran H. Mahmud's NPI number?
- 1518132489. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Gibran H. Mahmud, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 991 |
|---|---|
| Services billed to Medicare | 520,600 |
| Different services or procedures | 202 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Injection, ferric carboxymaltose, 1 mg (J1439)162,595 services
- Injection, filgrastim-ayow, biosimilar, (releuko), 1 microgram (Q5125)67,620 services
- Injection, nivolumab, 1 mg (J9299)27,560 services
- Injection, pembrolizumab, 1 mg (J9271)24,600 services
- Injection, paclitaxel, 1 mg (J9267)13,110 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol71%
- Arthritis49%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)46%
- Diabetes38%
- Chronic kidney disease34%
Hospitals where Gibran H. Mahmud works
Medicare's Facility Affiliation Data lists Gibran H. Mahmud at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Fairfield Memorial Hospital 1Fairfield, IL · Critical Access Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 141311
- Good Samaritan Regional Health CenterMount Vernon, IL · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 140046
- HSHS St Elizabeth's HospitalO Fallon, IL · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 140187
- Salem Township HospitalSalem, IL · Critical Access Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 141345
- SSM Health St Mary's Hospital -CentraliaCentralia, IL · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 140034
Practice locations
Addresses where Gibran H. Mahmud is enrolled with Medicare (CMS data updated October 2, 2026).
- 1052 M L King Dr, Suite 2Centralia, IL 62801 (618) 436‑5410
- 213 Nw10th St DFairfield, IL 62837 (618) 847‑8296
Group practices
Medicare enrollment lists Gibran H. Mahmud as a member of this group (CMS data updated October 2, 2026).
- Cancer Care Specialists of Central Illinois SC31 clinicians in the group
Specialties
- Hematology/Oncologyprimary
Other hematologist-oncologists in Illinois
Clinicians with the same Medicare primary specialty in Illinois — not a recommendation.
Other clinicians in Cancer Care Specialists of Central Illinois SC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2008 (18 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1518132489 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians