NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. Mandy Sher Greenberg, M.D.

Surgical Oncology Physician in Norwalk, CT · enumerated 2007.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1043414436

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name Dr. Mandy Sher Greenberg
Credential M.D.
Sex Female
Practice address Norwalk, CT, 06851
Phone (203) 846-6012
Fax (203) 846-6014
Enumeration date Jun 12, 2007
Last updated in NPPES Oct 29, 2013

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

2086X0206X Surgical Oncology Physician Allopathic & Osteopathic Physicians · License 49180 (CT) Primary
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

How do I verify Mandy Greenberg's NPI record?
Cross-check NPI 1043414436 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1043414436 active?
Yes, as of the latest NPPES snapshot, NPI 1043414436 is active (record last updated 2013-10-29).

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-10-29.