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GEOFFREY S SPENCER MD
NPI 1578625828
Internal Medicine - Gastroenterology in San Jose, CA

Active since December 14, 2006PECOS EnrolledAccepts Medicare Assignment
2440 SAMARITAN DR, SUITE #1, SAN JOSE, CA 95124(408) 626-7375(408) 626-7368 Get Directions Write a Review

NPPES record last updated: July 14, 2009. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Geoffrey S Spencer Md NPPES

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

GEOFFREY S SPENCER MD (NPI 1578625828) is an individual gastroenterology provider in San Jose, California, licensed in California (A108150) and active in the NPI registry since December 2006. He is enrolled in Medicare PECOS and is a graduate of Eastern Virginia Medical School (2000).

NPPES Registry Identity

NPI1578625828
Entity TypeIndividualMale
Primary Taxonomy207RG0100X
Provider Legal NameGEOFFREY S SPENCERCredential: MD
Location Address2440 SAMARITAN DR, SUITE #1San Jose, CA 95124-3911
Mailing Address2440 Samaritan Dr, Suite #1San Jose, CA 95124-3911 · (408) 626-7375 · Fax (408) 626-7368
Phone(408) 626-7375
Fax(408) 626-7368
Sole ProprietorYes
Medical School CMSEastern Virginia Medical SchoolGraduated 2000
Enumeration DateDecember 14, 2006
Last NPPES UpdateJuly 14, 2009
✔ NPI 1578625828 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · GastroenterologyAllopathic & Osteopathic Physicians
Taxonomy Code207RG0100X
Licenses✔ Licensed in CA · A108150✔ Licensed in PA · MD421763
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.
2440 SAMARITAN DR, San Jose, CA 95124
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Geoffrey S Spencer Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID2163514241
PECOS Enrollment IDI20091110000230
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Geoffrey Spencer reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Sutter Bay Medical Foundation
0.2 mi
Ambulatory Surgical
2506 SAMARITAN CT
San Jose, CA 95124
NPI 1033817168 (408) 203-3941

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

Areas of Expertise CMS Part B claims 11

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Biopsy of large bowel using a flexible endoscope 45380
A biopsy of the large bowel using a flexible endoscope is a procedure where a thin, flexible tube with a camera is inserted through the rectum to examine the bowel. If abnormal tissue is found, a small sample is taken for further examination. This helps in diagnosing conditions like inflammation, polyps, or cancer.
451 services450 patients
Removal of polyps or growths of large bowel using an endoscope with mechanical snare 45385
This procedure involves using a thin, flexible tube called an endoscope to examine the large bowel. If any abnormal growths or polyps are found, a tool called a mechanical snare is used to remove them. This is a common method to prevent potential health issues.
286 services286 patients
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
274 services229 patients
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope 43239
This procedure involves using a thin, flexible tube with a light and camera, known as an endoscope, to examine the esophagus, stomach, and upper part of the small intestine. Small tissue samples are taken for further examination to help diagnose various conditions.
239 services234 patients
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223
Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.
91 services88 patients
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
75 services70 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 95124 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$156.67 typical visit price
range $70.37 – $206.04
Typical copayment $39.16 (range $17.59 – $51.51)
Most-billed visit code 99204
Established Patient
$121.77 typical visit price
range $23.96 – $169.60
Typical copayment $30.44 (range $5.99 – $42.40)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 3

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. KRIKOR BARSOUMIAN M.D.
Ophthalmology
2440 SAMARITAN DR, SUITE 3
SAN JOSE, CA 95124
Santa Clara County (408) 559-4194
MR. DAVID ET STEIN MD
Internal Medicine (Gastroenterology)
2440 SAMARITAN DR, #1
SAN JOSE, CA 95124
Santa Clara County (408) 626-7375
KRIKOR BARSOUMIAN A PROFESSIONAL CORPORATION
Ophthalmology
2440 SAMARITAN DR, SUITE 3
SAN JOSE, CA 95124
Santa Clara County (408) 559-4194

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 Geoffrey Spencer's NPI number?

The NPI number for Geoffrey Spencer is 1578625828. It was assigned to this individual provider in the NPPES registry on December 14, 2006.

Where is Geoffrey Spencer located?

Geoffrey Spencer practices at 2440 Samaritan Dr Suite #1, San Jose, CA 95124. The listed phone number is (408) 626-7375.

What is Geoffrey Spencer's specialty?

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

Is Geoffrey Spencer enrolled in Medicare?

Yes. Geoffrey Spencer is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organization bills Medicare for Geoffrey Spencer's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Geoffrey Spencer reassigns Medicare benefits to Sutter Bay Medical Foundation (San Jose, CA). The 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 Geoffrey Spencer's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Geoffrey Spencer was last updated on July 14, 2009. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 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.