THOMAS GEOGHEGAN WEISER MD
NPI 1144201625
Surgery - Surgical Critical Care in Palo Alto, CA
About Thomas Geoghegan Weiser Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
THOMAS GEOGHEGAN WEISER MD (NPI 1144201625) is an individual surgical critical care provider in Palo Alto, California, licensed in California (A84864) and active in the NPI registry since November 2005. He is enrolled in Medicare PECOS and is a graduate of University Of New Mexico School Of Medicine (2002).
NPPES Registry Identity
Specialties & Licenses 2
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
Thomas Geoghegan Weiser 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.
Medicare Billing Reassignments
2Medicare enrollment records show Thomas Weiser reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Stanford, CA 94305
- Reassigned Medicare billing, California enrollment
- 4,258 clinicians in this Medicare group
Palo Alto, CA 94304
- Reassigned Medicare billing, California enrollment
- 3,617 clinicians in this Medicare group
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 3
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.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
PALO ALTO, CA 94304
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 Thomas Weiser's NPI number?
The NPI number for Thomas Weiser is 1144201625. It was assigned to this individual provider in the NPPES registry on November 10, 2005.
Where is Thomas Weiser located?
Thomas Weiser practices at 300 Pasteur Dr, Palo Alto, CA 94304. The listed phone number is (650) 723-4000.
What is Thomas Weiser's specialty?
The primary specialty registered for this NPI is Surgery, specializing in Surgical Critical Care, with taxonomy code 2086S0102X.
Is Thomas Weiser enrolled in Medicare?
Yes. Thomas Weiser 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 organizations bill Medicare for Thomas Weiser's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Thomas Weiser reassigns Medicare benefits to 2 organizations: Stanford Health Care (Stanford, CA) and Lpch Medical Group Div Of Lucile (Palo Alto, CA). Each 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 Thomas Weiser'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 Thomas Weiser was last updated on April 29, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.
# Thomas Geoghegan Weiser, MD · NPI 1144201625
Surgical Critical Care physician in Palo Alto, California. Individual provider, active in the CMS NPPES registry since November 10, 2005.
## Identity
- **NPI:** 1144201625 (Entity type: Individual)
- **Enumerated:** November 10, 2005
- **Primary specialty:** Surgery - Surgical Critical Care · taxonomy 2086S0102X
- **State license:** A84864 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 300 PASTEUR DR, Palo Alto, CA 94304-2203
- **Phone:** (650) 723-4000
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Stanford Health Care (NPI 1437292927, Stanford, CA); Lpch Medical Group Div Of Lucile (NPI 1417907940, Palo Alto, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of New Mexico School Of Medicine, class of 2002
## Record status
- **NPPES last updated:** April 29, 2024
---
Source: [NPI Profile](https://npiprofile.com/npi/1144201625) · Data from the CMS NPPES public registry.