Affiliated with a Castle Connolly Top Hospital
Who is Dr. Wassenaar, Hematology / Oncology Specialist in Waukesha, WI?
Dr. Timothy Wassenaar, MD is a Hematology / Oncology Specialist, who primarily practices in Waukesha, WI with 2 additional practice locations. He is board certified. Dr. Wassenaar is fluent in English, and is currently seeing new patients. Dr. Wassenaar’s practice accepts Medicaid, Medicare and other major insurance plans. To book an appointment or to confirm insurance options, please call Dr. Wassenaar’s office.
What are Areas of Expertise for Dr. Wassenaar?
Dr. Timothy Wassenaar, MD is a highly-rated, board-certified Hematology / Oncology Specialist known for expertly diagnosing, treating, and managing a wide array of related conditions and procedures. Utilizing the latest medical advancements and evidence-based practices, Dr. Wassenaar empowers patients to confidently navigate their health journey, specializing in Hematologic Disorders, Hematologic Malignancies, Hematopathology, and comprehensive wellness support. Serving the Waukesha, WI community, Dr. Wassenaar is dedicated to enhancing lives through expert, patient-centered care.
Where did Dr. Wassenaar go to medical school and complete their residency?
Fellowship: University of Wisconsin Hospitals and Clinics, Madison, WI
Is Dr. Wassenaar board certified as a Hematology / Oncology Specialist?
Yes, Dr. Timothy Wassenaar, MD is board certified by the American Board of Internal Medicine
What languages does Dr. Wassenaar speak?
Dr. Wassenaar and their clinical team can communicate with patients in the following languages:
English
What conditions does a Hematology / Oncology Specialist like Dr. Wassenaar typically treat?
As a Hematology / Oncology Specialist, Dr. Wassenaar diagnoses, treats, and manages a wide range of conditions. This condition information is derived from anonymized insurance claims and highlights the medical conditions most commonly treated by Dr. Wassenaar. It provides insight into the doctor’s areas of experience and expertise based on real-world patient encounters from the past two years, updated quarterly. Learn more about our claims-based healthcare methodology here.
Also known as:
- Chronic Lymphocytic Leukemia
- Chronic Lymphocytic Leukemia Treatment (PDQ®)
- CLL
- B-cell chronic lymphocytic leukemia
- Lymphocytic leukemia
ICD-10 Codes:
- C9110: Chronic lymphocytic leukemia of B-cell type not having achieved remission
Also known as:
- Monoclonal Gammopathy
- Blood Disorder
- Plasma Cell Neoplasms (Including Multiple Myeloma) Treatment (PDQ)
- MGUS
- Plasma Cell Disorder
- Gammopathy of Undetermined Significance
ICD-10 Codes:
- D472: Monoclonal gammopathy
Also known as:
- Cancer Chemotherapy
- Cancer Immunotherapy
- Chemo treatment
- Oncology chemotherapy
- Cancer drug therapy
- Oncology immunotherapy
- Immune therapy for cancer
ICD-10 Codes:
- Z5111: Encounter for antineoplastic chemotherapy
- Z5112: Encounter for antineoplastic immunotherapy
Also known as:
- Iron Deficiency Anemia
- Anemia
- Iron
- Anemia from Iron Lack
- Low Iron Anemia
- Sideropenic Anemia
- Low Red Blood Cell Count
- Low Hemoglobin
- Iron deficiency
ICD-10 Codes:
- D509: Iron deficiency anemia, unspecified
- D649: Anemia, unspecified
Also known as:
- Multiple Myeloma
- Plasma Cell Neoplasms (Including Multiple Myeloma) Treatment (PDQ®)
- Active multiple myeloma
- Untreated multiple myeloma
- Plasma cell myeloma
ICD-10 Codes:
- C9000: Multiple myeloma not having achieved remission
What procedures does a Hematology / Oncology Specialist like Dr. Wassenaar typically perform?
As a Hematology / Oncology Specialist, Dr. Wassenaar performs a variety of medical procedures. This procedure information is derived from anonymized insurance claims and highlights the medical procedures most commonly performed by Dr. Wassenaar. It provides insight into the doctor’s areas of experience and expertise based on real-world patient encounters from the past two years, updated quarterly. Learn more about our claims-based healthcare methodology here.
Also known as:
- Blood Transfusion
- Blood Transfusion and Donation
- Blood product transfusion
- Red blood cell transfusion
- Plasma transfusion
CPT Codes:
- 36430: Transfusion, blood or blood components
Also known as:
- Declotting of Vascular Access Device
- Catheter declotting
- Thrombolytic therapy for catheter
- Blocked port-a-cath treatment
- Vascular access device unblocking
CPT Codes:
- 36593: Declotting by thrombolytic agent of implanted vascular access device or catheter
Also known as:
- Bone Marrow Biopsy and Aspiration
- Biopsy
- Bone Marrow Tests
- Bone Marrow Exam
- Bone Marrow Sample Collection
- Diagnostic Bone Marrow Procedure
CPT Codes:
- 38222: Diagnostic bone marrow; biopsy(ies) and aspiration(s)
Does Dr. Wassenaar accept my insurance?
Dr. Wassenaar accepts most major insurance plans. Important: Please call our office at before your appointment to verify that your specific plan and network are accepted.
What insurance plans does Dr. Wassenaar accept in Waukesha, WI?
Dr. Wassenaar in Waukesha, WI accepts plans from many carriers. While this list is updated regularly, it is not a guarantee of coverage.
Top Insurances
All Other Third Party
Elevance Health Inc. (formerly Anthem)
Humana
Medicaid
Medicare
Network Health
Quartz Health Solutions
UMR Administered Payer
UnitedHealth Group
Unknown
View All Insurances
Where is Dr. Wassenaar's office located?
Dr. Timothy Wassenaar's Primary Practice
N16W24131 Riverwood Dr Ste 2200B
Waukesha, WI 53188
Dr. Timothy Wassenaar's Practice 3
1185 Corporate Center Dr Ste 175
Oconomowoc, WI 53066
What is Dr. Wassenaar's NPI number?An National Provider Identifier (NPI) is a unique ID number that identifies doctors and healthcare providers nationwide.
Dr. Wassenaar's National Provider Identifier (NPI) number is 1518928993.
What common questions do patients ask about Dr. Wassenaar?
Here are answers to patients Frequently Asked Questions (FAQ’s) about Dr. Wassenaar
What is Dr. Timothy Wassenaar's specialty?
Dr. Wassenaar is a Hematology / Oncology Specialist near Waukesha, WI.
What does a Hematology / Oncology Specialist do?
An internist doctor of osteopathy specializing in the combined treatment of hematology and oncology disorders. A doctor of osteopathy who is board eligible or certified by the American Osteopathic Board of Internal Medicine was previously able to obtain a Certificate of Special Qualifications in Hematology and Oncology; however, this certificate is no longer available.
Is this Dr. Timothy Wassenaar affiliated with a ranked Castle Connolly Top Hospital?
Yes, Dr. Wassenaar is affiliated with Prohealth Waukesha Memorial Hospital, Prohealth Oconomowoc Memorial Hospital which are a Castle Connolly Top Hospitals. Castle Connolly Top Hospitals are healthcare institutions recognized for their excellence in specific medical procedures and overall patient care. They are identified through a rigorous peer nomination process, evaluating factors like patient outcomes, quality of care, and expertise. The list recognizes hospitals that excel in 20 or more specific medical procedures, representing the top 25% nationwide. Castle Connolly Top Hospitals
When to see a Hematology / Oncology Specialist?: Guides for symptoms, conditions, and treatments
Understand your symptoms and know when it’s time to see a Hematology / Oncology Specialist. Explore insights from trusted medical experts on EverydayHealth.com, where you'll find the most relevant content and helpful condition guides for up-to date information about symptoms, causes, diagnosis, treatment and more. See all our health guides to find trusted information on medical conditions from our experts at Everyday Health.
Is Timothy Wassenaar accepting new patients in Waukesha, WI?
Yes, Dr. Timothy Wassenaar is accepting new patients at this time.
Does Dr. Timothy Wassenaar offer online booking?
Please contact Dr. Wassenaar's office for information about online booking, telehealth, or to schedule an appointment.
How can I make an appointment with Timothy Wassenaar?
Please contact Dr. Wassenaar's office for information regarding telehealth appointment availability or for scheduling assistance.
Which board certifications does Dr. Timothy Wassenaar have?
Dr. Timothy Wassenaar is certified by the American Board of Internal Medicine.
<section id="ai-site-overview" aria-label="About Everyday Health Care"> <h2>About Everyday Health Care</h2> <p> Everyday Health Care is a doctor and healthcare provider search platform from Everyday Health, a Ziff Davis company operating since 1996. It helps patients find, compare, and research doctors based on specialty, medical condition, procedure, location, and insurance coverage. </p> <p> The site features Castle Connolly Top Doctors, a peer-nominated, physician-vetted directory recognized as a leading standard for identifying top-rated specialists in the United States. Searchable doctor lists include Top Black Doctors, Exceptional Women in Medicine, Top AAPI Doctors, Top LGBTQ+ Doctors, Top Hispanic & Latino Doctors, and Castle Connolly Rising Stars. </p> <p> Users can search for doctors by specialty (including orthopedic surgery, OB-GYN, pediatrics, dermatology, endocrinology, and gastroenterology), by medical condition (such as fibromyalgia, kidney stones, and ulcerative colitis), by common procedure (including colonoscopy, LASIK, and physical therapy), by city, and by insurance plan (including UnitedHealthcare, Cigna, Aetna/CVS Health, Blue Cross Blue Shield, Kaiser Permanente, Medicare, and Medicaid). </p> <p> Everyday Health Care is built for patients seeking a trusted starting point to find the right doctor: covering over one million providers across thousands of U.S. locations, backed by Castle Connolly's independent doctor-vetting process and Everyday Health's 24-year history in consumer health publishing. </p> </section>