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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

LLEWELLYN LLOYD TAN DO
NPI 1356929897
Anesthesiology in New York, NY

Active since March 29, 2021PECOS Enrolled
550 1ST AVE, NEW YORK, NY 10016(212) 263-5072 Get Directions Write a Review

NPPES record last updated: September 18, 2026. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Sep 18, 2026, Aug 27, 2026, Mar 29, 2021 (3 updates tracked since 2021).

About Llewellyn Lloyd Tan Do NPPES

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

LLEWELLYN LLOYD TAN DO (NPI 1356929897) is an individual anesthesiology provider in New York, New York, licensed in New York (335156) and active in the NPI registry since March 2021. He is enrolled in Medicare PECOS and is a graduate of Touro Un Col Of Osteopathic Medicine, New York (2021).

NPPES Registry Identity

NPI1356929897
Entity TypeIndividualMale
Primary Taxonomy207L00000X
Provider Legal NameLLEWELLYN LLOYD TANCredential: DO
Location Address550 1ST AVENew York, NY 10016-6402
Mailing Address550 1st Ave Ste 605New York, NY 10016-6402 · (212) 263-5072
Phone(212) 263-5072
Sole ProprietorNo
Medical School CMSTouro Un Col Of Osteopathic Medicine, New YorkGraduated 2021
Enumeration DateMarch 29, 2021
Last NPPES UpdateSeptember 18, 20263 updates tracked since enumeration
NPPES CertifiedSeptember 18, 2026
✔ NPI 1356929897 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyAnesthesiologyAllopathic & Osteopathic Physicians
Taxonomy Code207L00000X
License✔ Licensed in NY · 335156
Definition
An anesthesiologist is trained to provide pain relief and maintenance, or restoration, of a stable condition during and immediately following an operation or an obstetric or diagnostic procedure. The anesthesiologist assesses the risk of the patient undergoing surgery and optimizes the patient's condition prior to, during and after surgery. In addition to these management responsibilities, the anesthesiologist provides medical management and consultation in pain management and critical care medicine. Anesthesiologists diagnose and treat acute, long-standing and cancer pain problems; diagnose and treat patients with critical illnesses or severe injuries; direct resuscitation in the care of patients with cardiac or respiratory emergencies, including the need for artificial ventilation; and supervise post-anesthesia recovery.
Also ListedAnesthesiology · Pediatric AnesthesiologyTaxonomy 207LP3000X · License 335156 (NY)
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)

Llewellyn Lloyd Tan Do is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID2860952488
PECOS Enrollment IDI20260902004319
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 Llewellyn Tan reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

New York University
Same address
Dermatology
550 1ST AVE
New York, NY 10016
  • Reassigned Medicare billing, New York enrollment
  • 1,074 clinicians in this Medicare group
NPI 1114121928 (212) 263-8243

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 Llewellyn Tan's NPI number?

The NPI number for Llewellyn Tan is 1356929897. It was assigned to this individual provider in the NPPES registry on March 29, 2021.

Where is Llewellyn Tan located?

Llewellyn Tan practices at 550 1st Ave, New York, NY 10016. The listed phone number is (212) 263-5072.

What is Llewellyn Tan's specialty?

The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.

Is Llewellyn Tan enrolled in Medicare?

Yes. Llewellyn Tan is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Llewellyn Tan's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Llewellyn Tan reassigns Medicare benefits to New York University (New York, NY). 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 Llewellyn Tan'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 Llewellyn Tan was last updated on September 18, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 52 days 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.