Jaap-Jan Boelens, MD, PhD
Pediatric Hematologic Oncologist
Chief, Pediatric Stem Cell Transplantation and Cellular Therapies Service
Cord Blood-Derived Cell Therapies for Children; Hematopoietic Cell Transplantation; Rare Pediatric Blood Diseases; Lysosomal Storage Diseases; Immune-Reconstitution; Pharmaco-Kinetics/Dynamics
New Patient Appointments
Scheduling a visit is easy. Click below or call us to get started.
Accepted Insurance Providers
Dr. Boelens accepts the following list of insurance providers. Select your insurance provider to see more details.
Memorial Sloan Kettering is an in-network provider with Aetna HMO, POS, and PPO plans. Aetna does not include us in any of the plans you can purchase through the insurance exchanges or through Medicare. Please ask your insurance if you need a one-time referral.
Blue Cross Blue Shield
In New York State
Memorial Sloan Kettering is an in-network provider with Empire Blue Cross Blue Shield (Wellpoint) of New York HMO, EPO, PPO, and POS plans, with the following exceptions:
- Empire Blue Cross Blue Shield does not include us in any of the plans you can buy through the insurance exchanges.
- Memorial Sloan Kettering is not an in-network provider for Empire's Medicare Managed Care plan known as Mediblue).
- The Empire Indemnity Plan provides limited coverage for our services.
Memorial Sloan Kettering is a designated Center of Excellence by Blue Cross Blue Shield.
In New Jersey
Memorial Sloan Kettering is an in-network provider with some Horizon Blue Cross Blue Shield of New Jersey plans for individuals, families, and small businesses. For example, the PPO plan is in-network with our Manhattan locations.
Horizon Blue Cross HMO is only in-network with our Basking Ridge, Bergen and Monmouth locations. It does not allow access to our Manhattan facilities.
Horizon Blue Cross PPO is in network with our Basking Ridge, Bergen, Monmouth and Manhattan locations.
OMNIA Plans: Tier I EPO based plan policy is only in-network with our Basking Ridge, Bergen and Monmouth locations and does not allow access to our Manhattan sites. Tier II EPO is only in-network with our Manhattan sites if it is a blue-card plan (there would be a suitcase logo indicating PPO on the front of the card).
Other plans may only be in-network at our Basking Ridge, Bergen or Monmouth locations.
Outside New York State and New Jersey
Some, but not all, Blue Cross Blue Shield plans outside of New York and New Jersey include Memorial Sloan Kettering as an in-network provider. Contact your insurance to find out if your plan provides in-network access to Memorial Sloan Kettering.
Memorial Sloan Kettering is an in-network provider with CIGNA's HMO, POS, and PPO plans. CIGNA does not include us in any of the plans you can buy through the insurance exchanges.
- If you are a New York State resident: Please ask your insurance if you need a one-time referral.
- If you live outside of New York State: Please ask your insurance if you have in-network access to Memorial Sloan Kettering.
Memorial Sloan Kettering is a designated Center of Excellence by Blue Cross Blue Shield.
EmblemHealth (including GHI, HIP, ConnectiCare, and Vytra)
Memorial Sloan Kettering is an in-network provider with EmblemHealth’s PPO, EPO, POS, and HMO plans as well as their Enhanced Care Prime Network, which supports Medicaid Managed Care and Child Health Plus and Medicare plans. Memorial Sloan Kettering is also in-network with the New York State Essential Emblem Health plan, which can be purchased on the insurance exchange. Emblem Health does not include us in any of its Medicare plans or in any of its Select Care network plans. You must bring a referral from your Emblem primary care doctor to your first appointment.
Empire Blue Cross Blue Shield Health Plus
Formerly known as Health Plus Amerigroup, Empire Blue Cross Blue Shield Health Plus is an in-network provider with Memorial Sloan Kettering. You will need a one-time referral from your primary care doctor.
Health Insurance Exchanges
We understand that there may be many complexities involved with insurance coverage purchased through the health exchange network of the Affordable Care Act. We're here to help. If you have questions about how your care will be covered by an insurance provider, or need help navigating a change in coverage, please call us at 646-227-3378; if you are not a resident of New York, you can call us at 866-248-1274. Our team is here to listen to your concerns and assist you in any way we can. We want our care to be as accessible and affordable for as many people as possible.
Memorial Sloan Kettering is an in-network provider with HealthSmart’s Accel, HSPC, and HPO networks.
Memorial Sloan Kettering is a designated Center of Excellence by Humana.
Interlink Health Services
Memorial Sloan Kettering is a designated Center of Excellence by Interlink Health Services.
Memorial Sloan Kettering is a designated Center of Excellence by Lifetrac.
Memorial Sloan Kettering is an in-network provider for all MagnaCare health plans except those products you can buy through the insurance exchanges.
New York State Medicaid covers physician and hospital services at Memorial Sloan Kettering. Patients are responsible for co-payments.
We also have contractual relationships involving Medicaid Managed Care plans. MSK is an in-network provider with Medicaid NY Emblem Health (formerly known as HIP) and Medicaid NY Empire Blue Cross Blue Shield HealthPlus (formerly known as Amerigroup). You will need a one-time referral from your primary care doctor.
In New York: Memorial Sloan Kettering’s New York locations are in-network with the Emblem
In New Jersey: Memorial Sloan Kettering’s New Jersey locations in Basking Ridge, Bergen and Monmouth are in-network with the Horizon Medicare Advantage Plan. This plan is not accepted for care provided at MSK’s New York locations.
If you are enrolled in any other Medicare Advantage plan, please contact your insurance carrier to determine your benefits and coverage at Memorial Sloan Kettering since your access may be limited.
Memorial Sloan Kettering is an in-network provider with some Multiplan/Beech Street/PHCS plans. Contact your insurance carrier to find out if your plan provides in-network access to Memorial Sloan Kettering.
Memorial Sloan Kettering is a designated Center of Excellence by Multiplan.
Multiple Insurance Plans
If you are covered by more than one insurance plan, you will want to determine your benefits from both plans. First, you need to determine which one is your primary insurance provider by contacting your employee benefits office or your insurance carriers. After you find out which is your primary insurance provider, you should then contact your insurance carrier to determine if you have access to Memorial Sloan Kettering.
Memorial Sloan Kettering is an in-network provider with some MVP plans. Contact your insurance carrier to find out if your plan provides in-network access to Memorial Sloan Kettering.
New York State Employee Health Insurance Plan (Empire Plan)
Memorial Sloan Kettering is an in-network provider for New York State employees who have enrolled in UnitedHealthcare's Cancer Resource Services. If you have the Empire Plan, you should call Cancer Resources Services at 866-936-6002 to verify and enroll in this coverage.
Memorial Sloan Kettering is in-network with Oscar's Circle Plus Network, a part of its Small Group Broad line that is offered only to select small business groups. Oscar does not include Memorial Sloan Kettering as an in-network provider for any of its individual plans. Please confirm eligibility with your insurance carrier.
Other Coverage Options
We have agreements with several insurance companies that may provide additional coverage for cancer patients. These benefit programs include:
- AXA Assistance USA
- Beech Street
- Integrated Health Plans
- National Health Administrators
- National Preferred Provider Network
- UnitedHealthcare's Cancer Resource Services
- United Resource Network
- Veterans Choice Program
Memorial Sloan Kettering is an in-network provider with Oxford’s Freedom and Liberty plans as well as the Metro Plan (which is only offered to small business groups and no longer offered as individual plans). Please confirm with your insurance if you need a one-time referral. Note: Oxford's Medicare Managed Care plan — Secure Horizon — does not include Memorial Sloan Kettering as an in-network provider. Oxford does not include us in any of the plans you can buy through the insurance exchanges.
Memorial Sloan Kettering is an in-network provider with QualCare's PPO and HMO/POS network.
Specialty Care Management
Memorial Sloan Kettering is a designated Center of Excellence by Specialty Care Management.
Memorial Sloan Kettering is an in-network provider with UnitedHealthCare's HMO, POS, and PPO plans. Please confirm with your insurance if a one-time referral is needed.
UnitedHealthCare's Medicare Managed Care plan does not include Memorial Sloan Kettering as an in-network provider.
United does not include us in any of the plans you can buy through the insurance exchanges.
Memorial Sloan Kettering is a designated Center of Excellence by UnitedHealthcare.
World Trade Center Health Program
Memorial Sloan Kettering is an in-network provider with the World Trade Center Health Program.
Contact and Location
Find a Convenient Location
Memorial Sloan Kettering has locations throughout New York City, Long Island, New Jersey, and Westchester. These locations offers many services, including screening, chemotherapy, and medical testing.
MD, University Medical Center Utrecht, Netherlands; PhD, University of Amsterdam/Academic Medical Center
Pediatrics - Leiden University Medical Center/Juliana Kinderziekenhuis, Leiden, The Hague, Netherlands
Immunology – University Medical Center Utrecht, Netherlands; Oncology – Erasmus University Medical Center, Netherlands
Pediatrics; Oncology (Netherlands)
I am a pediatric hematologic oncologist and Chief of Stem Cell Transplantation and Cell Therapy Service. I specialize in bone marrow and cord blood transplantation to treat blood diseases in children and young adults. I have particular expertise in treating rare diseases, such as lysosomal storage disorders. I am also part of a dedicated community of experts who are working to develop new treatment strategies for our young patients. Our goal is to be able to better control their disease while improving their well-being, as well as that of their families.
Before coming to Memorial Sloan Kettering in 2018, I spent a decade developing a cord blood transplant program in the Netherlands. This program is now the largest in Europe. Cord blood transplants are important because they offer a promising treatment for people who don’t have a suitable bone marrow match. I am continuing to build on this work by looking for ways to incorporate cellular therapies with transplants. My goal is to offer an even greater chance of eliminating disease while also making less of an impact on patients’ quality of life.
My research in the lab is fueled by my passion to help young people with blood disorders lead long and healthy lives. We are currently working to develop advanced therapies made from cord blood that will target blood disorders at the cellular level. We are also creating mathematical models that can help us predict how a young person’s immune system will respond to receiving treatments like this. By taking a holistic look at both treatment and response, I want to take discoveries out of the lab and to the bedside to help my patients.
When I meet with patients and their families, they are often dealing with a lot of uncertainties. They have been given a life-changing diagnosis and are facing questions about treatment, complications, prognosis, and how all of this will impact their family. I guide patients and families through these unknowns by giving them time and space to ask questions and process information. My communication policy is to be completely open and honest so that my patients feel heard, respected, and cared for. We’ll spend as much time together as necessary to make sure this happens.
Outside of the hospital, I enjoy cooking, cycling, and traveling with my family to such places as Africa, Asia, and South America.
Awards and Honors
- Swammerdam Prize for Innovation in Cell Therapy/Oncology, The Dutch Society of Hematology (2015)
Doctors at Memorial Sloan Kettering work as teams, with specialists from all different areas. This allows us to consider all your needs together, and to give you the best possible care.
Find a Clinical Trial for You
Memorial Sloan Kettering's doctors and scientists are constantly developing new treatments for cancer. MSK is typically running hundreds of clinical trials at a given time.
You may be able to participate in a clinical trial even if you are new to MSK. Search our online directory to find trial information and see more about who can participate.
Research and Publications
Admiraal R, Nierkens S, de Witte MA, Petersen EJ, Fleurke GJ, Verrest L, Belitser SV, Bredius RG, Raymakers RA, Knibbe CA, Minnema MC, van Kesteren C, Kuball J, Boelens JJ. Association between anti-thymocyte globulin exposure and survival outcomes in adult unrelated haemopoietic cell transplantation: a retrospective, pharmacodynamic cohort analysis. Lancet Haematol. 2017 Apr;4(4):e183-e191. doi: 10.1016/S2352-3026(17)30029-7
Admiraal R, de Koning C, Lindemans CA, Bierings MB, Wensing AM, Versluys AB, Wolfs TF, Nierkens S, Boelens JJ. Viral Reactivations and Associated Outcomes in Context of Immune Reconstitution after Pediatric Hematopoietic Cell Transplantation. J Allergy Clin Immunol. 2017 Apr 6. pii: S0091-6749(17)30571-7. doi: 10.1016/j.jaci.2016.12.992.
Admiraal R, Lindemans CA, van Kesteren C, Bierings MB, Versluys AB, Nierkens S, Boelens JJ. Excellent T-cell reconstitution and survival provided ATG exposure is low or absent after pediatric cord blood transplantation. Blood 2016 Oct 4. pii: blood-2016-06-721936. PubMed PMID: 27702800.
Admiraal R, van Kesteren C, Jol-van der Zijde CM, Lankester AC, van Tol MJ, Knibbe CA, Bredius RG, Boelens JJ. Association between anti-thymocyte globulin exposure and CD4+ immune reconstitution in paediatric haemopoietic cell transplantation: a multicentre, retrospective pharmacodynamics cohort analysis. Lancet Haematol. 2015;2(5):e194-203
Bartelink I, Lalmohamed A, Elisabeth M van Reij, Christopher C Dvorak,Rada M Savic, Juliette Zwaveling, Robbert G Bredius, Antoine C Egberts, Marc Bierings, Peter Shaw, Christa E Nath, George Hempel, Marc Ansari,Maja Krajinovic, Yves Theoret, Michel Duval, MD; Ron J Keizer, PhD, Henrique Bittencourt, Moustapha Hassan, Tayfun Güng.r, Robert F Wynn, Paul Veys, Geoff D Cuvelier, Sarah Marktel, Robert Chiesa, Morton J Cowan, Mary A Slatter, Melisa K Stricherz, Cathryn Jennissen, Morris Kletzel, Janel R Long-Boyle, Jaap J Boelens, Association of Busulfan exposure with survival and toxicity after HCT in Children and Young Adults: a Multicenter Retrospective Cohort Analysis Lancet Hematology 2016; 10.1016/S2352-3026(16)30114-4.
Spel L, Boelens JJ, van der Steen DM et al, Natural killer cells facilitate PRAME-specific T-cell reactivity against neuroblastoma. Oncotarget. 2015 Nov 3;6(34):35770-81.
Aldenhoven M, Wynn RF, Orchard PJ, O’Meara A, Veys P, Fischer A, Valayannopoulos V, Neven B, Rovelli A, Prasad VK, Tolar J, Allewelt H, Jones SA, Parini R, Renard M, Bordon V, Wulffraat NM, de Koning TJ, Shapiro EG, Kurtzberg J, Boelens JJ. Long-term outcome of Hurler syndrome patients after hematopoietic cell transplantation: an international multicenter study. Blood 2015 Mar 26;125(13):2164-72.
Publications on PubMed
Visit PubMed for a full listing of Dr. Boelens’s journal articles. Pubmed is an online index of research papers and other articles from the US National Library of Medicine and the National Institutes of Health.