FRANK E. MAYER, M.D., A PROFESSIONAL CORPORATION
NPI 1841465499
Internal Medicine - Gastroenterology in La Jolla, CA

Q: What is Frank E. Mayer, M.D., A Professional Corporation's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Active since April 24, 2008

9850 GENESEE AVE, SUITE 560, LA JOLLA, CA 92037(858) 457-3737(858) 452-1421 Get Directions Write a Review

NPPES record last updated: April 24, 2008. Verified against the NPPES registry weekly; last sync: November 08, 2026.

On this page

About Frank E. Mayer, M.d., A Professional Corporation NPPES

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

FRANK E. MAYER, M.D., A PROFESSIONAL CORPORATION (NPI 1841465499) is a healthcare organization registered as a gastroenterology in La Jolla, California and active in the NPI registry since April 2008. The organization lists Frank E. Mayer, President, as its authorized official.

NPPES Registry Identity

NPI1841465499

Entity TypeOrganization

Primary Taxonomy207RG0100X

Legal Business NameFRANK E. MAYER, M.D., A PROFESSIONAL CORPORATION

Location Address9850 GENESEE AVE, SUITE 560La Jolla, CA 92037-1229

Mailing Address9850 Genesee Ave, Suite 560La Jolla, CA 92037-1229 · (858) 457-3737 · Fax (858) 452-1421

Phone(858) 457-3737

Fax(858) 452-1421

Organization SubpartNo

Authorized OfficialFrank E. MayerPresident · (858) 755-7429

Enumeration DateApril 24, 2008

✔ NPI 1841465499 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · GastroenterologyAllopathic & Osteopathic Physicians

Taxonomy Code207RG0100X

License✔ Licensed in CA · G40234

Definition

An internist who specializes in diagnosis and treatment of diseases of the digestive organs including the stomach, bowels, liver and gallbladder. This specialist treats conditions such as abdominal pain, ulcers, diarrhea, cancer and jaundice and performs complex diagnostic and therapeutic procedures using endoscopes to visualize internal organs.

9850 GENESEE AVE, La Jolla, CA 92037

Open in Google Maps ↗

Other Identifiers 1

Medicare UPING40234CA

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 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)

Frank E. Mayer, M.d., A Professional Corporation is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

Medicare enrollment records show 1 clinician reassigns Medicare billing to Frank E. Mayer, M.D., A Professional Corporation, which bills Medicare for the services this clinician delivers.

Clinician (1)

Frank Mayer, M.D.

Gastroenterology

NPI 1598760589

9850 GENESEE AVE STE 930
La Jolla, CA 92037

(858) 457-3737

✔ PECOS✔ Accepts MedicareSame address

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 Frank E. Mayer, M.D., A Professional Corporation's NPI number?

The NPI number for Frank E. Mayer, M.D., A Professional Corporation is 1841465499. It was assigned to this organization in the NPPES registry on April 24, 2008.

Where is Frank E. Mayer, M.D., A Professional Corporation located?

Frank E. Mayer, M.D., A Professional Corporation is located at 9850 Genesee Ave Suite 560, La Jolla, CA 92037. The listed phone number is (858) 457-3737.

What is Frank E. Mayer, M.D., A Professional Corporation's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Is Frank E. Mayer, M.D., A Professional Corporation enrolled in Medicare?

Yes. Frank E. Mayer, M.D., A Professional Corporation is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Frank E. Mayer, M.D., A Professional Corporation?

According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Gastroenterology) reassigns their Medicare billing to Frank E. Mayer, M.D., A Professional Corporation. 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. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for Frank E. Mayer, M.D., A Professional Corporation was last updated on April 24, 2008. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 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.