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

Dr. Sheldon Alan Greenspan, MD

Adult Medicine Physician in Williston Park, NY · enumerated 2006 · practices at Mary Jensis-Carlson D P M.

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

National Provider Identifier

1508836370

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Dr. Sheldon Alan Greenspan

Credential MD

Sex Male

Practice address Williston Park, NY, 11596

Phone (516) 741-6111

Fax (516) 741-7539

Enumeration date Jan 25, 2006

Last updated in NPPES Jul 27, 2007

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

Taxonomy & licenses

207QA0505X Adult Medicine Physician Allopathic & Osteopathic Physicians · License 170066 (NY) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
01020800	Medicaid	NY	-

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 Sheldon Greenspan's NPI record?

Cross-check NPI 1508836370 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1508836370 active?

Yes, as of the latest NPPES snapshot, NPI 1508836370 is active (record last updated 2007-07-27).

Other providers at this practice address

Browse all →

Mary Jensis- Carlson Foot Surgery Podiatrist · Williston Park, NY NPI 1851494165 Mary Jensis-Carlson D P M Foot Surgery Podiatrist · Williston Park, NY NPI 1508002783

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-27.