PENINSULA GASTROINTESTINAL
NPI 1306144209
Internal Medicine - Gastroenterology in San Mateo, CA
About Peninsula Gastrointestinal NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
PENINSULA GASTROINTESTINAL (NPI 1306144209) is a healthcare organization registered as a gastroenterology in San Mateo, California and active in the NPI registry since March 2011. The organization holds a CLIA Certificate of Compliance certificate valid through December 3, 2027 and lists Edward K Onuma, President, as its authorized official.
NPPES Registry Identity
Specialties & Licenses
Group Practice 1
Medicare Participation & PECOS CMS
Medicare enrollment, revalidation and the clinicians who bill Medicare through this organization, from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Peninsula Gastrointestinal is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Revalidation Due Date
Revalidation due by December 31, 2026
Medicare-enrolled providers and suppliers confirm their enrollment information with CMS on a set cycle, every 5 years for most and every 3 years for medical equipment suppliers. CMS sets the due date for each enrollment.
Clinicians Billing Medicare Through This Organization
3Medicare enrollment records show 3 clinicians reassign Medicare billing to Peninsula Gastrointestinal, which bills Medicare for the services they deliver. Of these, 2 practice within 10 miles. They are listed nearest first.
Clinicians, nearest first (3)
San Mateo, CA 94401
San Mateo, CA 94401
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
CLIA Laboratory Certificates CMS CLIA
Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.
Certificate of Compliance 05D2306662
Peninsula Gastrointestinal Specialists Inc · San Mateo, CAFrequently 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 Peninsula Gastrointestinal's NPI number?
The NPI number for Peninsula Gastrointestinal is 1306144209. It was assigned to this organization in the NPPES registry on March 2, 2011.
Where is Peninsula Gastrointestinal located?
Peninsula Gastrointestinal is located at 100 S Ellsworth Ave Suite 507, San Mateo, CA 94401. The listed phone number is (650) 342-7432.
What is Peninsula Gastrointestinal's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.
Is Peninsula Gastrointestinal enrolled in Medicare?
Yes. Peninsula Gastrointestinal is registered in the Medicare PECOS enrollment system.
When is Peninsula Gastrointestinal's Medicare revalidation due?
According to the CMS Revalidation Due Date List (October 2026 release), the Medicare Non-DME Part B enrollment for this organization (California, Clinic/Group Practice) is due for revalidation by December 31, 2026. Medicare providers and suppliers revalidate their enrollment every 5 years, and medical equipment suppliers every 3 years. Confirm current requirements with your Medicare Administrative Contractor.
How many clinicians bill Medicare through Peninsula Gastrointestinal?
According to the CMS Revalidation Reassignment List (October 2026 release), 3 clinicians reassign their Medicare billing to Peninsula Gastrointestinal, in Gastroenterology and Pathology. 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.
Does Peninsula Gastrointestinal hold a CLIA laboratory certificate?
Yes. A Certificate of Compliance (number 05D2306662) is associated with this NPI, valid through December 3, 2027. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.
When was this NPI record last updated?
The NPPES record for Peninsula Gastrointestinal was last updated on August 18, 2016. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 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.
# Peninsula Gastrointestinal · NPI 1306144209
Gastroenterology organization in San Mateo, California. Organization record, active in the CMS NPPES registry since March 2, 2011.
## Identity
- **NPI:** 1306144209 (Entity type: Organization)
- **Enumerated:** March 2, 2011
- **Primary specialty:** Internal Medicine - Gastroenterology · taxonomy 207RG0100X
- **Organization subpart:** No
- **Authorized official:** Edward Onuma, PRESIDENT
## Practice location
- **Address:** 100 S ELLSWORTH AVE, SUITE 507, San Mateo, CA 94401-3939
- **Phone:** (650) 342-7432 · **Fax:** (650) 342-3239
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Medicare revalidation due:** December 31, 2026 (Non-DME Part B, California, Clinic/Group Practice) · CMS Revalidation Due Date List, October 2026 release
- **Clinicians billing through this organization:** 3 clinicians in 2 Medicare specialties reassign Medicare billing to this organization (form CMS-855R); largest: Gastroenterology (2), Pathology (1); 2 practice within 10 miles · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** August 18, 2016
- **CLIA laboratory certificates:** 1 on file
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Source: [NPI Profile](https://npiprofile.com/npi/1306144209) · Data from the CMS NPPES public registry.