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DR. GUILLERMO ELIAS PI M.D.
NPI 1366898777
Pediatrics - Adolescent Medicine in New York, NY

Active since May 04, 2016PECOS Enrolled
550 1ST AVE, NEW YORK, NY 10016(212) 263-5506 Get Directions Write a Review

NPPES record last updated: May 15, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: May 15, 2026, Aug 4, 2025, May 29, 2020 and 1 more (4 updates tracked since 2016).

About Dr. Guillermo Elias Pi M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. GUILLERMO ELIAS PI M.D. (NPI 1366898777) is an individual adolescent medicine provider in New York, New York, licensed in New York (297594) and active in the NPI registry since May 2016. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1366898777
Entity TypeIndividualMale
Primary Taxonomy2080A0000X
Provider Legal NameDR. GUILLERMO ELIAS PICredential: M.D.
Location Address550 1ST AVENew York, NY 10016-6402
Mailing Address550 1st AveNew York, NY 10016-6402 · (212) 263-5506
Phone(212) 263-5506
Sole ProprietorYes
Enumeration DateMay 4, 2016
Last NPPES UpdateMay 15, 20264 updates tracked since enumeration
NPPES CertifiedMay 15, 2026
✔ NPI 1366898777 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 4

★ Primary SpecialtyPediatrics · Adolescent MedicineAllopathic & Osteopathic Physicians
Taxonomy Code2080A0000X
License✔ Licensed in NY · 297594
Definition
A pediatrician who specializes in adolescent medicine is a multi-disciplinary healthcare specialist trained in the unique physical, psychological and social characteristics of adolescents, their healthcare problems and needs.
Also ListedInternal Medicine · Adolescent MedicineTaxonomy 207RA0000X · License 297594 (NY)
Also ListedPediatricsTaxonomy 208000000X · License 297594 (NY)
Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X
550 1ST AVE, New York, NY 10016
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Guillermo Elias Pi M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Guillermo Pi reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

New York University
1,039 mi
Cardiovascular Disease
3301 QUANTUM BLVD
Boynton Beach, FL 33426
  • Reassigned Medicare billing, New York enrollment
  • 7,712 clinicians in this Medicare group
NPI 1285826438 (877) 648-2964

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. SHARON URALIL D.O.
Internal Medicine
550 1ST AVE
NEW YORK, NY 10016
New York County (212) 263-3293
DR. DIANA TREVAS FLEISHER
Emergency Medicine (Pediatric Emergency Medicine)
550 1ST AVE
NEW YORK, NY 10016
New York County (212) 263-3293
DR. MONICA GUPTA M.D.
Allergy & Immunology
550 1ST AVE, NBV 16N30, INTERNAL MEDICINE RESIDENCY PROGRAM
NEW YORK, NY 10016
New York County (212) 263-6397
CHRISTINE CHAN M.D.
Student in an Organized Health Care Education/Training Program
550 1ST AVE
NEW YORK, NY 10016
New York County (212) 263-5506
DR. MATTHEW CHIARELLO MD
Radiology (Vascular & Interventional Radiology)
550 1ST AVE
NEW YORK, NY 10016
New York County (212) 263-5506
DR. MEGAN ELIZABETH JENKINS M.D.
Surgery
550 1ST AVE
NEW YORK, NY 10016
New York County (212) 263-7300
DR. MANAN PATEL M.D.
Student in an Organized Health Care Education/Training Program
550 1ST AVE
NEW YORK, NY 10016
New York County (212) 263-5506
VICKY CHIANG
Student in an Organized Health Care Education/Training Program
550 1ST AVE
NEW YORK, NY 10016
New York County (212) 263-5506

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Guillermo Pi's NPI number?

The NPI number for Guillermo Pi is 1366898777. It was assigned to this individual provider in the NPPES registry on May 4, 2016.

Where is Guillermo Pi located?

Guillermo Pi practices at 550 1st Ave, New York, NY 10016. The listed phone number is (212) 263-5506.

What is Guillermo Pi's specialty?

The primary specialty registered for this NPI is Pediatrics, specializing in Adolescent Medicine, with taxonomy code 2080A0000X.

Is Guillermo Pi enrolled in Medicare?

Yes. Guillermo Pi is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Guillermo Pi's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Guillermo Pi reassigns Medicare benefits to New York University (Boynton Beach, FL). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Guillermo Pi's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Guillermo Pi was last updated on May 15, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.