Dr Guillermo J Pastrana Maisonet, MD - Medicare General Practice in San Juan, PR

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Dr Guillermo J Pastrana Maisonet, MD is a medicare enrolled "General Practice" physician in San Juan, Puerto Rico. He graduated from medical school in 2008 and has 16 years of diverse experience with area of expertise as General Practice. He is a member of the group practice Pastrana Toledo Medical Group, Llc and his current practice location is 505 Ave Hostos, San Juan, Puerto Rico. You can reach out to his office (for appointments etc.) via phone at (787) 902-6631.

Dr Guillermo J Pastrana Maisonet is licensed to practice in Puerto Rico (license number 18300) 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 1124307814.

Contact Information

Dr Guillermo J Pastrana Maisonet, MD
505 Ave Hostos,
San Juan, PR 00918-3201
(787) 902-6631
(787) 339-2700

Map and Direction




Physician's Profile

Full NameDr Guillermo J Pastrana Maisonet
GenderMale
SpecialityGeneral Practice
Experience16 Years
Location505 Ave Hostos, San Juan, Puerto Rico
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 J Pastrana Maisonet graduated from medical school in 2008
  NPI Data:
  • NPI Number: 1124307814
  • Provider Enumeration Date: 08/11/2011
  • Last Update Date: 01/25/2024
  Medicare PECOS Information:
  • PECOS PAC ID: 5991976714
  • Enrollment ID: I20110927000300

Medical Identifiers

Medical identifiers for Dr Guillermo J Pastrana Maisonet such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1124307814NPI-NPPES
18300OtherPRPR MEDICAL LICENSE NUMBER

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
208D00000XGeneral Practice 18300 (Puerto Rico)Primary

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Pastrana Toledo Medical Group, Llc17597936642

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 J Pastrana Maisonet allows following entities to bill medicare on his behalf.
Entity NamePastrana Toledo Medical Group, Llc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1922609650
PECOS PAC ID: 1759793664
Enrollment ID: O20201217003051

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 J Pastrana Maisonet 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 J Pastrana Maisonet, MD
Po Box 8578,
San Juan, PR 00910-0578

Ph: (787) 488-0292		Dr Guillermo J Pastrana Maisonet, MD
505 Ave Hostos,
San Juan, PR 00918-3201

Ph: (787) 902-6631

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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