Dr Guillermo Lazo-diaz, MD - Medicare Medical Oncology in Mcallen, TX

Dr Guillermo Lazo-diaz, MD is a medicare enrolled "Internal Medicine - Medical Oncology" physician in Mcallen, Texas. He graduated from medical school in 1993 and has 31 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 1901 S 2nd St, Mcallen, Texas. You can reach out to his office (for appointments etc.) via phone at (956) 687-5150.

Dr Guillermo Lazo-diaz is licensed to practice in Texas (license number L0370) 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 1760421101.

Contact Information

Dr Guillermo Lazo-diaz, MD
1901 S 2nd St,
Mcallen, TX 78503-1271
(956) 687-5150
(956) 687-9546

Map and Direction




Physician's Profile

Full NameDr Guillermo Lazo-diaz
GenderMale
SpecialityMedical Oncology
Experience31 Years
Location1901 S 2nd St, Mcallen, 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 Guillermo Lazo-diaz graduated from medical school in 1993
  NPI Data:
  • NPI Number: 1760421101
  • Provider Enumeration Date: 06/04/2006
  • Last Update Date: 12/11/2008
  Medicare PECOS Information:
  • PECOS PAC ID: 4385628601
  • Enrollment ID: I20040615000932

Medical Identifiers

Medical identifiers for Dr Guillermo Lazo-diaz such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1760421101NPI-NPPES
42067104MedicaidTX
42067103MedicaidTX
8S7051OtherTXBLUE CROSS OF TX

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207RX0202XInternal Medicine - Medical Oncology L0370 (Texas)Primary
207RH0003XInternal Medicine - Hematology & Oncology L0370 (Texas)Secondary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Hospice Compassionate Care Services LlcMission, TXHospice
Rio Grande Regional HospitalMcallen, TXHospital
South Texas Health SystemEdinburg, TXHospital
Doctors Hospital At RenaissanceEdinburg, 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 Guillermo Lazo-diaz 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 Guillermo Lazo-diaz 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 Guillermo Lazo-diaz, MD
Po Box 911230,
Dallas, TX 75391-1230

Ph: (972) 997-8000
Dr Guillermo Lazo-diaz, MD
1901 S 2nd St,
Mcallen, TX 78503-1271

Ph: (956) 687-5150

Reviews and Comments


Internal Medicine Doctors in Mcallen, TX

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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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