ADVANCED INTERNAL MEDICINE ASSOCIATES, INC
NPI 1598187486
Internal Medicine in Madera, CA

Q: What is Advanced Internal Medicine Associates, Inc's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Active since January 10, 2014

1111 W 4TH ST, BLD B, MADERA, CA 93637(559) 662-2700(559) 673-1588 Get Directions Write a Review

NPPES record last updated: January 10, 2014. Verified against the NPPES registry weekly; last sync: October 25, 2026.

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About Advanced Internal Medicine Associates, Inc NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

ADVANCED INTERNAL MEDICINE ASSOCIATES, INC (NPI 1598187486) is a healthcare organization registered as an internal medicine in Madera, California and active in the NPI registry since January 2014. The organization lists Allan T Nassar, President, as its authorized official.

NPPES Registry Identity

NPI1598187486

Entity TypeOrganization

Primary Taxonomy207R00000X

Legal Business NameADVANCED INTERNAL MEDICINE ASSOCIATES, INC

Location Address1111 W 4TH ST, BLD BMadera, CA 93637-4474

Mailing Address1111 W 4th St, Bld BMadera, CA 93637-4474 · (559) 662-2700 · Fax (559) 673-1588

Phone(559) 662-2700

Fax(559) 673-1588

Organization SubpartNo

Authorized OfficialAllan T NassarPresident · (559) 662-2700

Enumeration DateJanuary 10, 2014

✔ NPI 1598187486 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207R00000X

Definition

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

1111 W 4TH ST, Madera, CA 93637

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Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X MULTIPLE SINGLE SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Advanced Internal Medicine Associates, Inc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

Medicare enrollment records show 2 clinicians reassign Medicare billing to Advanced Internal Medicine Associates, Inc, which bills Medicare for the services they deliver. Of these, 2 practice within 10 miles. They are listed nearest first.

Clinicians, nearest first (2)

Steven Gustaveson, MD

Internal Medicine

NPI 1598777559

1111 W 4TH ST BLDG B
Madera, CA 93637

(559) 662-2705

✔ PECOS✔ Accepts Medicare6.3 mi

Allan Nassar, MD

Internal Medicine

NPI 1033129135

1111 W 4TH ST BLDING B
Madera, CA 93637

(559) 662-2705

✔ PECOS✔ Accepts Medicare6.3 mi

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Advanced Internal Medicine Associates, Inc's NPI number?

The NPI number for Advanced Internal Medicine Associates, Inc is 1598187486. It was assigned to this organization in the NPPES registry on January 10, 2014.

Where is Advanced Internal Medicine Associates, Inc located?

Advanced Internal Medicine Associates, Inc is located at 1111 W 4th St Bld B, Madera, CA 93637. The listed phone number is (559) 662-2700.

What is Advanced Internal Medicine Associates, Inc's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Advanced Internal Medicine Associates, Inc enrolled in Medicare?

Yes. Advanced Internal Medicine Associates, Inc is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Advanced Internal Medicine Associates, Inc?

According to the CMS Revalidation Reassignment List (October 2026 release), 2 clinicians, all in Internal Medicine, reassign their Medicare billing to Advanced Internal Medicine Associates, Inc. A reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for the clinician's services. Of these, 2 practice within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for Advanced Internal Medicine Associates, Inc was last updated on January 10, 2014. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.