Lynn Van Ummersen, MD
Medical Oncology Physician · Orange City, FL
Lynn Van Ummersen, MD is a medical oncology physician with a practice address in Orange City, Florida, and NPI 1447211818, issued on Mar 28, 2006. Check the license (Florida 99045, as entered in NPPES) on the Florida health license search; the Medicare figures below come from public CMS files.
- Name
- Lynn Van Ummersen
- Credential
- MD
- Primary taxonomy
- Medical Oncology Physician 207RX0202X
- License number
- 99045 FL
Self-reported in NPPES; status is on the state search - Practice location
- 2824 Enterprise RD, Orange City, FL 32763
- Phone
- (386) 774-7411
- Enumerated
- Mar 28, 2006
- Record last updated
- Jul 2, 2026
- Medicaid ID
- 000924400 FL
- Medicare enrollment
- Enrolled (PECOS I20090609000054); accepts Medicare assignment
- Medical or professional school
- University Of Massachusetts Medical School, 1991
- Entity
- Type 1 · individual
8 nearest medical oncology physician records → All 561 in Florida → Look up another NPI →
Also registered at 2824 Enterprise RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Carla Christo, APRNFamily Nurse Practitioner1730810466
- Atlanta Cranias, PA-CPhysician Assistant1720656531
- Morgan Green, PA-CPhysician Assistant1861274433
- Jillian Lisiakowski, APRNFamily Nurse Practitioner1609475151
- Jennifer Merens Leake, APRNFamily Nurse Practitioner1356275689
Verify Lynn Van Ummersen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersFlorida health license search
Search for license 99045Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
13% more Medicare Part D claims than the average medical oncology physician in 2024
792 Medicare Part D claims for 145 beneficiaries, against an average of 703 among the 4,230 providers of this specialty who prescribed in Part D. Brand-name drugs were 22% of claims. 123 claims were for opioids.
Most prescribed
- Anastrozole77 claims
- Eliquis66 claims
- Zolpidem Tartrate41 claims
- Hydroxyurea40 claims
- Hydrocodone-Acetaminophen37 claims
- Letrozole29 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $1,732.07
84 payments; by number, the most common kind was food and beverage; the largest payer was Novartis Pharmaceuticals Corporation. The 3,343 providers of this specialty with any payment received $11,773.47 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Florida Cancer Specialists And Research Institute, LLCOrange City, FL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Lynn Van Ummersen among 561 medical oncology physician records in Florida
Lynn Van Ummersen, MD is one of 561 medical oncology physician records with a practice address in Florida. 91% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 20% of them.
- NPI issued2006 · 20% of these records are older, 46% newer
- In a Medicare fileYes · 91% of these records are
- In the CMS Doctors and Clinicians fileYes · 83% of these records are
- Graduated1991 · median 2000 among the 463 with a school on file
- Record last updated2026 · 24% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RX0202X and a Florida practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Medical Oncology Physician providers in Florida
There are 561 medical oncology physician records in Florida.
All 561 in Florida → Every provider in Orange City → Medical Oncology Physician nationwide →
The 8 medical oncology physician records with the nearest ZIP codes
- Marinely Cruz-Amy, M.D.Orange City, FL 327631740499532
- Victor Melgen, M.D.Orange City, FL 327631386693331
- Roderick Paras, MDOrange City, FL 327631902868789
- Tarek Eldawy, M.D.Oviedo, FL 327651669416459
- Maria Flores, M.D.Oviedo, FL 327651003809435
- Kapilkumar Manvar, MDOviedo, FL 327651588155949
- Bhanu Visvalingam, MDSanford, FL 327711336132844
- Hakam Khazrik, MDTavares, FL 327781154617496
Common questions
What is Lynn Van Ummersen, MD's NPI number?
Lynn Van Ummersen, MD's National Provider Identifier (NPI) is 1447211818, issued on Mar 28, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Lynn Van Ummersen, MD located?
The NPPES record lists a practice address at 2824 Enterprise RD, Orange City, FL, 32763. Phone: (386) 774-7411. Providers update this record themselves, so call before visiting.
How can I verify Lynn Van Ummersen, MD's license?
NPPES lists Florida license number 99045, as entered by the provider. Search the Florida health license search at https://mqa-internet.doh.state.fl.us/mqasearchservices/healthcareproviders. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Lynn Van Ummersen, MD prescribe under Medicare Part D?
In 2024, Lynn Van Ummersen, MD had 792 Medicare Part D claims for 145 beneficiaries; the average among medical oncology physician prescribers was 703. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.