Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Joshua Greenstein, M.D.

Nephrology Physician in Escondido, CA · enumerated 2006.

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

National Provider Identifier

1104881457

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Registry record

Entity type Individual (Type 1)

Name Joshua Greenstein

Credential M.D.

Sex Male

Practice address 1955 Citracado Pkwy Ste 301, Escondido, CA, 92029

Phone (760) 294-1660

Fax (760) 745-5016

Enumeration date Apr 19, 2006

Last updated in NPPES Jan 16, 2026

Taxonomy & licenses

207RN0300X Nephrology Physician Allopathic & Osteopathic Physicians · License A68100 (CA) 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
CB258825	Other	CA	ORANGE COUNTY PTAN
CA205056	Other	CA	NO CA PTAN
G0998Z	Other	CA	SO CA PTAN

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

Is NPI 1104881457 active?

Yes, as of the latest NPPES snapshot, NPI 1104881457 is active (record last updated 2026-01-16).

How do I verify Joshua Greenstein's NPI record?

Cross-check NPI 1104881457 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-01-16.