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

Jack Aizenstein, CO

Orthotist in New York, NY · enumerated 2017.

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

National Provider Identifier

1770023806

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Registry record

Entity type Individual (Type 1)

Name Jack Aizenstein

Credential CO

Sex Male

Practice address New York, NY, 10022

Phone (212) 888-7372

Fax (212) 888-1551

Enumeration date Mar 8, 2017

Last updated in NPPES Mar 8, 2017

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

Taxonomy & licenses

222Z00000X Orthotist Respiratory, Developmental, Rehabilitative and Restorative Service Providers Primary

332B00000X Durable Medical Equipment & Medical Supplies Suppliers Secondary

335E00000X Prosthetic/Orthotic Supplier Suppliers Secondary

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

What specialty is Jack Aizenstein?

Jack Aizenstein is registered in NPPES with the primary taxonomy of Orthotist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2017-03-08.