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RITCHKEN AND FIRST MEDICAL GROUP
NPI 1598819898
Clinic/Center - Multi-Specialty in San Diego, CA

Active since January 23, 2007
4282 GENESEE AVE, SUITE 103, SAN DIEGO, CA 92117(858) 292-0108(858) 292-9097 Get Directions Write a Review

NPPES record last updated: May 31, 2019. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Ritchken And First Medical Group NPPES

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

RITCHKEN AND FIRST MEDICAL GROUP (NPI 1598819898) is a healthcare organization registered as a multi-specialty in San Diego, California and active in the NPI registry since January 2007. The organization lists Maribel Alexander, Office Manager, as its authorized official.

NPPES Registry Identity

NPI1598819898
Entity TypeOrganization
Primary Taxonomy261QM1300X
Legal Business NameRITCHKEN AND FIRST MEDICAL GROUP
Location Address4282 GENESEE AVE, SUITE 103San Diego, CA 92117-4961
Mailing Address4282 Genesee Ave, Suite 103San Diego, CA 92117-4961 · (858) 292-0108 · Fax (858) 292-9097
Phone(858) 292-0108
Fax(858) 292-9097
Organization SubpartNo
Authorized OfficialMaribel AlexanderOffice Manager · (858) 292-0108
Enumeration DateJanuary 23, 2007
Last NPPES UpdateMay 31, 2019
✔ NPI 1598819898 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyClinic/Center · Multi-SpecialtyAmbulatory Health Care Facilities
Taxonomy Code261QM1300X
License✔ Licensed in CA · A33952
4282 GENESEE AVE, San Diego, CA 92117
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Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Ritchken And First Medical Group is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

2

Medicare enrollment records show 2 clinicians reassign Medicare billing to Ritchken And First Medical Group, which bills Medicare for the services they deliver. Of these, 2 practice at this address. They are listed nearest first.

Clinicians, nearest first (2)

Simon Ritchken, M.D.
Gastroenterology
NPI 1255399341
4282 GENESEE AVE SUITE 103
San Diego, CA 92117
(858) 292-0108
✔ PECOS✔ Accepts MedicareSame address
Brian First, M.D.
Internal Medicine
NPI 1770531816
4282 GENESEE AVE #103
San Diego, CA 92117
(858) 292-0108
✔ 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 Ritchken And First Medical Group's NPI number?

The NPI number for Ritchken And First Medical Group is 1598819898. It was assigned to this organization in the NPPES registry on January 23, 2007.

Where is Ritchken And First Medical Group located?

Ritchken And First Medical Group is located at 4282 Genesee Ave Suite 103, San Diego, CA 92117. The listed phone number is (858) 292-0108.

What is Ritchken And First Medical Group's specialty?

The primary specialty registered for this NPI is Clinic/Center, specializing in Multi-Specialty, with taxonomy code 261QM1300X.

Is Ritchken And First Medical Group enrolled in Medicare?

Yes. Ritchken And First Medical Group is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Ritchken And First Medical Group?

According to the CMS Revalidation Reassignment List (October 2026 release), 2 clinicians reassign their Medicare billing to Ritchken And First Medical Group, in Gastroenterology and Internal Medicine. 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 at this address. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for Ritchken And First Medical Group was last updated on May 31, 2019. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 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.