Guillermo A Ortiz San Juan, MD - Medicare Gastroenterology in Boston, MA

Guillermo A Ortiz San Juan, MD is a medicare enrolled "Internal Medicine - Gastroenterology" physician in Boston, Massachusetts. He graduated from medical school in 2012 and has 12 years of diverse experience with area of expertise as Gastroenterology. He is a member of the group practice Osu Internal Medicine Llc and his current practice location is 736 Cambridge St, Boston, Massachusetts. You can reach out to his office (for appointments etc.) via phone at (617) 789-3000.

Guillermo A Ortiz San Juan is licensed to practice in Ohio (license number 35.142043) 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 1083098784.

Contact Information

Guillermo A Ortiz San Juan, MD
736 Cambridge St,
Boston, MA 02135-2907
(617) 789-3000
Not Available

Map and Direction




Physician's Profile

Full NameGuillermo A Ortiz San Juan
GenderMale
SpecialityGastroenterology
Experience12 Years
Location736 Cambridge St, Boston, Massachusetts
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:
  • Guillermo A Ortiz San Juan graduated from medical school in 2012
  NPI Data:
  • NPI Number: 1083098784
  • Provider Enumeration Date: 07/13/2015
  • Last Update Date: 09/27/2021
  Medicare PECOS Information:
  • PECOS PAC ID: 7618268541
  • Enrollment ID: I20211006001178

Medical Identifiers

Medical identifiers for Guillermo A Ortiz San Juan such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1083098784NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207R00000XInternal Medicine 264170 (Massachusetts)Secondary
207RG0100XInternal Medicine - Gastroenterology 35.142043 (Ohio)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Ohio State University State Health SystemColumbus, OHHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Osu Internal Medicine Llc5496651408994

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. Guillermo A Ortiz San Juan allows following entities to bill medicare on his behalf.
Entity NameOsu Internal Medicine Llc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1740231448
PECOS PAC ID: 5496651408
Enrollment ID: O20031210000658

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. Guillermo A Ortiz San Juan 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
Guillermo A Ortiz San Juan, MD
700 Ackerman Rd Ste 2120,
Columbus, OH 43202-1559

Ph: (614) 293-7677
Guillermo A Ortiz San Juan, MD
736 Cambridge St,
Boston, MA 02135-2907

Ph: (617) 789-3000

Reviews and Comments


Internal Medicine Doctors in Boston, MA

Kaitlyn My-tu Lam, MBBS
Gastroenterology
Medicare: Not Enrolled in Medicare
Practice Location: Massachusetts General Hospital, 55 Fruit Street, Boston, MA 02114
Phone: 617-724-7738    
Kui Toh Gerard Leong, M.D.
Gastroenterology
Medicare: Not Enrolled in Medicare
Practice Location: 55 Fruit Street, Massachusetts General Hospital, Boston, MA 02114
Phone: 617-726-8862    
Ruma Rajbhandari,
Gastroenterology
Medicare: Accepting Medicare Assignments
Practice Location: 75 Francis St, Boston, MA 02115
Phone: 617-525-6841    
Alaka Ray, M.D.
Gastroenterology
Medicare: Accepting Medicare Assignments
Practice Location: Massachusetts General Hospital, 55 Fruit Street, Boston, MA 02114
Phone: 617-726-2066    
Meghan E Sise, M.D.
Gastroenterology
Medicare: Accepting Medicare Assignments
Practice Location: Massachusetts General Hospital, 55 Fruit Street, Boston, MA 02114
Phone: 617-726-2862    
Aaron Dickstein, M.D.
Gastroenterology
Medicare: Accepting Medicare Assignments
Practice Location: 800 Washington St, Box 233, Boston, MA 02111
Phone: 617-636-5883    Fax: 617-636-9292
Dr. Felicia Elizabeth Patch, MD
Gastroenterology
Medicare: Accepting Medicare Assignments
Practice Location: 801 Massachusetts Ave, Crosstown 2, Boston, MA 02118
Phone: 617-414-4376    Fax: 617-414-4676

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.