Dr Rena Desai Callahan, MD - Medicare Hematology/oncology in Valencia, CA

Dr Rena Desai Callahan, MD is a medicare enrolled "Internal Medicine" physician in Valencia, California. She went to Perelman School Of Med At The University Of Pennsylvania and graduated in 2004 and has 20 years of diverse experience with area of expertise as Hematology/oncology. She is a member of the group practice The Regents Of The University Of California and her current practice location is 27235 Tourney Rd Ste 2400, Valencia, California. You can reach out to her office (for appointments etc.) via phone at (661) 255-5350.

Dr Rena Desai Callahan is licensed to practice in California (license number A94238) and she also participates in the medicare program. She accepts medicare assignments (which means she accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and her NPI Number is 1487856779.

Contact Information

Dr Rena Desai Callahan, MD
27235 Tourney Rd Ste 2400,
Valencia, CA 91355-5905
(661) 255-5350
(661) 255-9907

Map and Direction




Physician's Profile

Full NameDr Rena Desai Callahan
GenderFemale
SpecialityHematology/oncology
Experience20 Years
Location27235 Tourney Rd Ste 2400, Valencia, California
Accepts Medicare AssignmentsYes. She accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance.
  Medical Education and Training:
  • Dr Rena Desai Callahan attended and graduated from Perelman School Of Med At The University Of Pennsylvania in 2004
  NPI Data:
  • NPI Number: 1487856779
  • Provider Enumeration Date: 05/31/2007
  • Last Update Date: 01/23/2020
  Medicare PECOS Information:
  • PECOS PAC ID: 6002906062
  • Enrollment ID: I20071214000493

Medical Identifiers

Medical identifiers for Dr Rena Desai Callahan such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1487856779NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207RH0000XInternal Medicine - Hematology A94238 (California)Secondary
207RX0202XInternal Medicine - Medical Oncology A94238 (California)Secondary
2086X0206XSurgery - Surgical Oncology A94238 (California)Secondary
207R00000XInternal Medicine A94238 (California)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Ronald Reagan Ucla Medical CenterLos angeles, CAHospital
Santa Monica - Ucla Med Ctr & Orthopaedic HospitalSanta monica, CAHospital
Henry Mayo Newhall HospitalValencia, CAHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
The Regents Of The University Of California13552485841177

Medicare Reassignments

Some practitioners may not bill the customers directly but medicare billing happens through clinics / group practice / hospitals where the provider works. Medicare reassignment of benefits is a mechanism by which practitioners allow third parties to bill and receive payment for medicare services performed by them. Dr Rena Desai Callahan allows following entities to bill medicare on her behalf.
Entity NameThe Regents Of The University Of California
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1235107566
PECOS PAC ID: 1355248584
Enrollment ID: O20031223000439
Entity NameThe Regents Of The University Of California
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1902861297
PECOS PAC ID: 8921076795
Enrollment ID: O20040920000697

Medicare Part D Prescriber Enrollment

Any physician or other eligible professional who prescribes Part D drugs must either enroll in the Medicare program or opt out in order to prescribe drugs to their patients with Part D prescription drug benefit plans. Dr Rena Desai Callahan is enrolled with medicare and thus, if eligible, can prescribe medicare part D drugs to patients with medicare part D benefits.

Mailing Address and Practice Location

Mailing AddressPractice Location Address
Dr Rena Desai Callahan, MD
5767 W Century Blvd Ste 400,
Los Angeles, CA 90045-5631

Ph: () -
Dr Rena Desai Callahan, MD
27235 Tourney Rd Ste 2400,
Valencia, CA 91355-5905

Ph: (661) 255-5350

Reviews and Comments


Internal Medicine Doctors in Valencia, CA

Mostafa Tabassomi, MD
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 23838 Valencia Blvd Ste 304, Valencia, CA 91355
Phone: 661-430-9030    Fax: 661-430-9020
Dr. Gene L Tran, D.O.
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 23803 Mcbean Pkwy, Valencia, CA 91355
Phone: 661-481-2400    
Dr. Robert Kozlowski, MD
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 25751 Mcbean Pkwy Ste 210, Valencia, CA 91355
Phone: 661-284-3100    Fax: 661-290-3310
Dr. Douglas R Gadowski, MD
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 25775 Mcbean Pkwy, Ste 105, Valencia, CA 91355
Phone: 661-255-2410    Fax: 661-255-8671
Sittiporn Bencharit, M.D.
Internal Medicine
Medicare: Medicare Enrolled
Practice Location: 25775 Mcbean Pkwy, Suite 115, Valencia, CA 91355
Phone: 661-255-2420    Fax: 661-259-0552
David Elliott Krieger, M.D.,PH.D.
Internal Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 25775 Mcbean Pkwy, Suite 115, Valencia, CA 91355
Phone: 661-255-2420    Fax: 661-259-5741
Arousha Davatgarzadeh, M.D.
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 26357 Mcbean Pkwy, Valencia, CA 91355
Phone: 661-222-2605    Fax: 661-222-2694

Medicare Program: Medicare is a federal government program which provides health insurance to people who are 65 or older. This program also covers certain younger people with disabilities (who receive Social Security Disability Insurance - SSDI), and people with End-Stage Renal Disease (permanent kidney failure requiring dialysis or a transplant, sometimes called ESRD.

Medicare Assignment: Assignment means that your doctor, provider, or supplier agrees (or is required by law) to accept the Medicare-approved amount as full payment for covered services. Most doctors, providers, and suppliers accept assignment, but you should always check to make sure. Participating providers have signed an agreement to accept assignment for all Medicare-covered services.

NPI Number: The National Provider Identifier (NPI) is a unique identification number for covered health care providers. The NPI must be used in lieu of legacy provider identifiers in the HIPAA standards transactions. Covered health care providers and all health plans and health care clearinghouses must use the NPIs in the administrative and financial transactions adopted under HIPAA (Health Insurance Portability and Accountability Act).

Our Data: Information on www.medicarelist.com is built using data sources published by Centers for Medicare & Medicaid Services (CMS) under Freedom of Information Act (FOIA). The information disclosed on the NPI Registry are FOIA-disclosable and are required to be disclosed under the FOIA and the eFOIA amendments to the FOIA. There is no way to 'opt out' or 'suppress' the NPPES record data for health care providers with active NPIs.