Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Justin David Merszei, MD

Nephrology Physician in Houston, TX · enumerated 2005 · practices at Greater Houston Kidney Specialists LLP.

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

National Provider Identifier

1649252529

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Registry record

Entity type Individual (Type 1)

Name Dr. Justin David Merszei

Credential MD

Sex Male

Practice address 10023 South Main Suite C-9, Main Medical Plaza, Houston, TX, 77025

Phone (713) 496-1077

Fax (713) 791-1710

Enumeration date Nov 16, 2005

Last updated in NPPES Jan 19, 2011

Taxonomy & licenses

207RN0300X Nephrology Physician Allopathic & Osteopathic Physicians · License L3016 (TX) 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

Is NPI 1649252529 active?

Yes, as of the latest NPPES snapshot, NPI 1649252529 is active (record last updated 2011-01-19).

How do I verify Justin Merszei's NPI record?

Cross-check NPI 1649252529 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Other providers at this practice address

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Greater Houston Kidney Specialists LLP Nephrology Specialist/Technologist · Houston, TX NPI 1396848313

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-01-19.