Quick answers
- Does Lynn Van Ummersen accept Medicare assignment?
- Yes. Medicare's clinician data says Lynn Van Ummersen 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 Lynn Van Ummersen see?
- In 2024, CMS data shows 417 Original Medicare patients and 101,271 services for Lynn Van Ummersen. This counts Original Medicare only and measures volume, not quality.
- What is Lynn Van Ummersen's NPI number?
- 1447211818. 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 Lynn Van Ummersen, 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 | 417 |
|---|---|
| Services billed to Medicare | 101,271 |
| Different services or procedures | 115 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Injection, ferumoxytol, for treatment of iron deficiency anemia, 1 mg (non-esrd use) (Q0138)21,420 services
- Injection, denosumab, 1 mg (J0897)4,920 services
- Injection, epoetin alfa, (for non-esrd use), 1000 units (J0885)2,280 services
- Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count (85025)697 services
- Insertion of needle into vein for collection of blood sample (36415)665 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%
- Diabetes42%
- Ischemic heart disease42%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)42%
Hospitals where Lynn Van Ummersen works
Medicare's Facility Affiliation Data lists Lynn Van Ummersen 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.
- AdventHealth DelandDeland, FL · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 100045
- AdventHealth Fish MemorialOrange City, FL · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 100072
- AdventHealth OrlandoOrlando, FL · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 100007
Practice locations
Addresses where Lynn Van Ummersen is enrolled with Medicare (CMS data updated October 2, 2026).
- 2824 Enterprise RdOrange City, FL 32763 (386) 774‑7411
- 810 N Spring Garden Avenue, Florida Cancer Specialist P LDeland, FL 32720 (386) 943‑9446
Group practices
Medicare enrollment lists Lynn Van Ummersen as a member of this group (CMS data updated October 2, 2026).
- Florida Cancer Specialists and Research Institute, LLC498 clinicians in the group
Specialties
- Hematology/Oncologyprimary
Other hematologist-oncologists in Orange City
Clinicians with the same Medicare primary specialty in Orange City, FL — not a recommendation.
Other clinicians in Florida Cancer Specialists and Research Institute, LLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Massachusetts Medical School |
| Graduation year | 1991 (35 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1447211818 |
| 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