Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Nephrology and Hypertension Specialists, LLC

Nephrology Physician in Fenton, MO · enumerated 2006 · authorized official John Mellas, Partner.

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

National Provider Identifier

1730127200

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Registry record

Entity type Organization (Type 2)

Legal business name Nephrology and Hypertension Specialists, LLC

Practice address 1011 Bowles Ave Ste 220, Fenton, MO, 63026

Phone (636) 681-3030

Fax (636) 326-1545

Enumeration date Jun 4, 2006

Last updated in NPPES Jan 22, 2024

Taxonomy & classification

207RN0300X Nephrology Physician Allopathic & Osteopathic Physicians Primary

Authorized official

Name John Mellas

Title Partner

Phone (314) 842-9669

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

Where is Nephrology and Hypertension Specialists, LLC located?

The practice location on file with NPPES is in Fenton, MO.

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2024-01-22. Verify at npiregistry.cms.hhs.gov.

Providers at this address

Browse all →

John Mellas Nephrology Physician · Fenton, MO NPI 1497712079 Mohammed Abbas Vascular & Interventional Radiology Physician · Fenton, MO NPI 1306057310

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-01-22.