Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Napa Valley Nephrology & Internal Medicine Medical Group, Inc.

Geriatric Medicine (Internal Medicine) Physician in Napa, CA · enumerated 2006 · authorized official Tammy Hill, Business Manager.

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

National Provider Identifier

1073572582

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Registry record

Entity type Organization (Type 2)

Legal business name Napa Valley Nephrology & Internal Medicine Medical Group, Inc.

Practice address 3443 Villa Ln, Suite 6, Napa, CA, 94558

Phone (707) 252-8407

Fax (707) 252-8335

Enumeration date Mar 22, 2006

Last updated in NPPES Sep 11, 2025

Taxonomy & classification

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians Secondary

207RG0300X Geriatric Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians Primary

207RN0300X Nephrology Physician Allopathic & Osteopathic Physicians Secondary

Authorized official

Name Tammy Hill

Title Business Manager

Phone (707) 252-8407

Other identifiers

Identifier	Type	State	Issuer
GR0024510	Medicaid	CA	-

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 is the NPI number for Napa Valley Nephrology & Internal Medicine Medical Group, Inc.?

The NPI for Napa Valley Nephrology & Internal Medicine Medical Group, Inc. is 1073572582, a Type 2 (organization) record in the CMS NPPES registry.

Who is the authorized official for Napa Valley Nephrology & Internal Medicine Medical Group, Inc.?

NPPES lists Tammy Hill (Business Manager) as the authorized official for this organization.

Providers at this address

Browse all →

Manoj Eapen Interventional Cardiology Physician · Napa, CA NPI 1801892666 Brian Mundy Cardiovascular Disease Physician · Napa, CA NPI 1225026180 John Rupnik Internal Medicine Physician · Napa, CA NPI 1942290770 Sergio Manubens Interventional Cardiology Physician · Napa, CA NPI 1487634879 James Srebro Interventional Cardiology Physician · Napa, CA NPI 1629048814 Thomas Paukert Nephrology Physician · Napa, CA NPI 1013989540 Nancy Tamarisk Primary Care Nurse Practitioner · Napa, CA NPI 1821058611 Wendell Wenneker Surgery Physician · Napa, CA NPI 1669480232

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-09-11.