Quick answers
- Does Flesscia S. Mercer accept Medicare assignment?
- Yes. Medicare's clinician data says Flesscia S. Mercer 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 Flesscia S. Mercer see?
- In 2024, CMS data shows 407 Original Medicare patients and 3,490 services for Flesscia S. Mercer. This counts Original Medicare only and measures volume, not quality.
- What is Flesscia S. Mercer's NPI number?
- 1265215610. 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 Flesscia S. Mercer, 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 | 407 |
|---|---|
| Services billed to Medicare | 3,490 |
| Different services or procedures | 58 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count (85025)337 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)307 services
- Insertion of needle into vein for collection of blood sample (36415)288 services
- Blood test, comprehensive group of blood chemicals (80053)285 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)247 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 cholesterol74%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)54%
- Arthritis44%
- Chronic kidney disease37%
- Diabetes35%
Hospitals where Flesscia S. Mercer works
Medicare's Facility Affiliation Data lists Flesscia S. Mercer 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.
- OSF Saint Clare Medical CenterPrinceton, IL · Critical Access Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 141337
- OSF Saint Elizabeth MDL CenterPeru, IL · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 140110
- OSF Saint Paul Medical CenterMendota, IL · Critical Access Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 141310
- Saint Francis Medical CenterPeoria, IL · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 140067
- St Mary Medical CenterGalesburg, IL · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 140064
Practice locations
Addresses where Flesscia S. Mercer is enrolled with Medicare (CMS data updated October 2, 2026).
- 336 Home BlvdGalesburg, IL 61401 (309) 341‑3000
- 8940 N Wood Sage RdPeoria, IL 61615 (309) 243‑3000
Group practices
Medicare enrollment lists Flesscia S. Mercer as a member of this group (CMS data updated October 2, 2026).
- Oncology-Hematology Associates of Central Illinois P C67 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Galesburg
Clinicians with the same Medicare primary specialty in Galesburg, IL — not a recommendation.
Other clinicians in Oncology-Hematology Associates of Central Illinois P C
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Graduation year | 2023 |
|---|---|
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1265215610 |
| 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