Quick answers
- Does Wissam Kiwan accept Medicare assignment?
- Yes. Medicare's clinician data says Wissam Kiwan 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 Wissam Kiwan see?
- In 2024, CMS data shows 220 Original Medicare patients and 497 services for Wissam Kiwan. This counts Original Medicare only and measures volume, not quality.
- What is Wissam Kiwan's NPI number?
- 1790164226. 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 Wissam Kiwan, 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 | 220 |
|---|---|
| Services billed to Medicare | 497 |
| Different services or procedures | 71 |
| Participating Medicare provider | Yes |
| Average age of these patients | 71 |
Most frequent services
- Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)42 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)41 services
- Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)33 services
- Review by radiologist of image from tube placement into bile duct using an endoscope (74328)26 services
- Exam of common bile and/or pancreatic duct using a flexible endoscope (43273)25 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 cholesterol72%
- Arthritis47%
- Anxiety42%
- Diabetes40%
- Ischemic heart disease38%
Hospitals where Wissam Kiwan works
Medicare's Facility Affiliation Data lists Wissam Kiwan 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.
- SSM Health Saint Louis University HospitalSaint Louis, MO · Acute Care Hospital · Medicare rating: 1 of 5 stars · Emergency services: listed by Medicare · CCN 260105
- SSM Health St Mary's Hospital - St LouisSaint Louis, MO · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 260091
- Truman Medical Center Hospital HillKansas City, MO · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 260048
Practice locations
Addresses where Wissam Kiwan is enrolled with Medicare (CMS data updated October 2, 2026).
- 10101 Woodfield LnSaint Louis, MO 63132 (608) 280‑4647
- 1201 S Grand BlvdSaint Louis, MO 63104 (314) 617‑2000
- 1225 S Grand BlvdSaint Louis, MO 63104
- 6420 Clayton RdSaint Louis, MO 63117 (314) 768‑8208
- 6420 Clayton Rd, Fl 1Saint Louis, MO 63117 (314) 768‑8491
Group practices
Medicare enrollment lists Wissam Kiwan as a member of this group (CMS data updated October 2, 2026).
- SSM Health Care Group940 clinicians in the group
Specialties
- Gastroenterologyprimary
- Internal Medicinealso
Other gastroenterologists in Saint Louis
Clinicians with the same Medicare primary specialty in Saint Louis, MO — not a recommendation.
Other clinicians in SSM Health Care Group
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2014 (12 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1790164226 |
| 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