Lynn Van Ummersen, MD
NPI 1447211818 · Medical Oncology Physician · Orange City, FL
Enrolled with Medicare as Practitioner - Hematology/Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Lynn Van Ummersen, MD is a Medical Oncology Physician provider in Orange City, FL (NPI 1447211818).
Provider details
- NPI number
- 1447211818
- Entity type
- Individual
- Primary specialty
- Medical Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 99045 (FL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
2,766 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Complete Blood Cell Count (red Cells, White Blood Cell, Platelets), Automated Test and Automated Differential White Blood Cell Count85025 | 697 | $8 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 665 | $9 |
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 | 383 | $14 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 356 | $88 |
| Infusion Into a Vein for Therapy, Prevention, Or Diagnosis, 1 Hour Or Less96365 | 167 | $59 |
| Infusion Into a Vein for Therapy, Prevention, Or Diagnosis, Additional Sequential Infusion, 1 Hour Or Less96367 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 22 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Anastrozole | 77 | 22 |
| Apixabanbrand: Eliquis | 66 | 15 |
| Zolpidem Tartrate | 41 | — |
| Hydroxyurea | 40 | — |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 37 | — |
| Letrozole | 29 | — |
| Oxycodone Hcl | 26 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,732 across 84 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (1)
- 810 N Spring Garden Ave Ste 101Deland, FL 32720-3106Phone: (386) 943-9446Fax: (386) 943-9385
Registry dates
- Enumerated
- 2006-03-28
- Last updated
- 2023-08-30
- Certified
- 2023-08-30
Frequently asked questions
- What is Lynn Van Ummersen's NPI number?
- Lynn Van Ummersen's National Provider Identifier (NPI) is 1447211818, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Lynn Van Ummersen's specialty?
- Lynn Van Ummersen is listed in the NPPES registry with a primary specialty of Medical Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Lynn Van Ummersen located?
- Lynn Van Ummersen's practice location on file with NPPES is 765 Image Way, Orange City, FL 32763-8399.
- What is Lynn Van Ummersen's phone number?
- The practice phone number listed in the NPPES registry for Lynn Van Ummersen is (386) 774-7411.
- Does Lynn Van Ummersen accept Medicare?
- Lynn Van Ummersen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Lynn Van Ummersen's NPI active?
- Yes — Lynn Van Ummersen's NPI (1447211818) is active in the NPPES registry as of the last update on 2023-08-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.