Dr Rene Alberto Castillo, MD - Medicare Medical Oncology in Austin, TX

Dr Rene Alberto Castillo, MD is a medicare enrolled "Internal Medicine - Medical Oncology" physician in Austin, Texas. He graduated from medical school in 1987 and has 37 years of diverse experience with area of expertise as Medical Oncology. He is a member of the group practice Texas Oncology Pa and his current practice location is 4101 James Casey St Ste 100, Austin, Texas. You can reach out to his office (for appointments etc.) via phone at (512) 447-2202.

Dr Rene Alberto Castillo is licensed to practice in Texas (license number M3964) and he also participates in the medicare program. He accepts medicare assignments (which means he accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and his NPI Number is 1134186166.

Contact Information

Dr Rene Alberto Castillo, MD
4101 James Casey St Ste 100,
Austin, TX 78745-1145
(512) 447-2202
(512) 447-5337

Map and Direction




Physician's Profile

Full NameDr Rene Alberto Castillo
GenderMale
SpecialityMedical Oncology
Experience37 Years
Location4101 James Casey St Ste 100, Austin, Texas
Accepts Medicare AssignmentsYes. He accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance.
  Medical Education and Training:
  • Dr Rene Alberto Castillo graduated from medical school in 1987
  NPI Data:
  • NPI Number: 1134186166
  • Provider Enumeration Date: 04/26/2006
  • Last Update Date: 02/10/2023
  Medicare PECOS Information:
  • PECOS PAC ID: 9133128994
  • Enrollment ID: I20061206000020

Medical Identifiers

Medical identifiers for Dr Rene Alberto Castillo such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1134186166NPI-NPPES
P00662892OtherTXRAILROAD MEDICARE
8BP223OtherTXBCBS OF TX
182873303MedicaidTX
182873302MedicaidTX
P00662592OtherTXRAILROAD MEDICARE

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207RH0003XInternal Medicine - Hematology & Oncology MD.12610R (Louisiana)Secondary
207RH0003XInternal Medicine - Hematology & Oncology M3964 (Texas)Secondary
207RX0202XInternal Medicine - Medical Oncology M3964 (Texas)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Christus Santa Rosa Hospital-san MarcosSan marcos, TXHospital
St David's South Austin Medical CenterAustin, TXHospital
Memorial HospitalGonzales, TXHospital
Ascension Seton HaysKyle, TXHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Texas Oncology Pa5395658934855

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 Rene Alberto Castillo allows following entities to bill medicare on his behalf.
Entity NameTexas Oncology Pa
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1811944101
PECOS PAC ID: 5395658934
Enrollment ID: O20031124000323

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 Rene Alberto Castillo 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 Rene Alberto Castillo, MD
Po Box 911230,
Dallas, TX 75391-1230

Ph: (972) 997-8000
Dr Rene Alberto Castillo, MD
4101 James Casey St Ste 100,
Austin, TX 78745-1145

Ph: (512) 447-2202

Reviews and Comments


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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).

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