Quick answers
- Does Regina Y. Chiu accept Medicare assignment?
- Yes. Medicare's clinician data says Regina Y. Chiu 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 Regina Y. Chiu see?
- In 2024, CMS data shows 1,586 Original Medicare patients and 4,241 services for Regina Y. Chiu. This counts Original Medicare only and measures volume, not quality.
- What is Regina Y. Chiu's NPI number?
- 1043272693. 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 Regina Y. Chiu, 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 | 1,586 |
|---|---|
| Services billed to Medicare | 4,241 |
| Different services or procedures | 49 |
| Participating Medicare provider | Yes |
| Average age of these patients | 76 |
Most frequent services
- Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)1,169 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)436 services
- Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's (G2211)403 services
- Ultrasound of heart with color-depicted blood flow, rate, direction and valve function (93306)355 services
- Evaluation of single, dual, multiple lead or leadless pacemaker system or implantable defibrillator system, remote up to 90 days (93296)172 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 cholesterol75%
- Arthritis57%
- Ischemic heart disease56%
- Diabetes44%
- Chronic kidney disease43%
Hospitals where Regina Y. Chiu works
Medicare's Facility Affiliation Data lists Regina Y. Chiu 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.
- HSHS St Elizabeth's HospitalO Fallon, IL · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 140187
- Memorial HospitalBelleville, IL · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 140185
- Red Bud Regional HospitalRed Bud, IL · Critical Access Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 141348
- Sparta Community HospitalSparta, IL · Critical Access Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 141349
- St Josephs HospitalBreese, IL · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 140145
Practice locations
Addresses where Regina Y. Chiu is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 10; the Medicare profile lists all.
- 1 Saint Elizabeth BlvdO Fallon, IL 62269 (618) 234‑2120
- 1215 Franciscan DrLitchfield, IL 62056 (217) 324‑2191
- 1515 Main StHighland, IL 62249 (618) 651‑2831
- 200 Health Care DrGreenville, IL 62246 (618) 664‑1230
- 200 Health Care Dr, Suite 1501Greenville, IL 62246 (618) 690‑3411
Group practices
Medicare enrollment lists Regina Y. Chiu as a member of these groups (CMS data updated October 2, 2026).
- Prairie Cardiovascular Consultants Ltd90 clinicians in the group
- St Elizabeths Hospital of the Hospital Sisters of the Third Order29 clinicians in the group
- HSHS Holy Family Hospital Inc25 clinicians in the group
Specialties
Find other Cardiovascular Disease (Cardiology) doctors in Illinois →
Other cardiologists in O Fallon
Clinicians with the same Medicare primary specialty in O Fallon, IL — not a recommendation.
Other clinicians in Prairie Cardiovascular Consultants Ltd
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Saint Louis University School Of Medicine |
| Graduation year | 1999 (27 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1043272693 |
| 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