CHETAN GIRI AMBASTHA MD
NPI 1275279648
Internal Medicine in Stanford, CA
About Chetan Giri Ambastha Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
CHETAN GIRI AMBASTHA MD (NPI 1275279648) is an individual internal medicine provider in Stanford, California, licensed in California (A190131) and active in the NPI registry since May 2022. He is enrolled in Medicare PECOS and is a graduate of Washington University School Of Medicine (2022).
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 (PECOS)
Chetan Giri Ambastha Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
2Medicare enrollment records show Chetan Ambastha 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 94305 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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.
STANFORD, CA 94305
STANFORD, CA 94305
STANFORD, CA 94305
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 Chetan Ambastha's NPI number?
The NPI number for Chetan Ambastha is 1275279648. It was assigned to this individual provider in the NPPES registry on May 9, 2022.
Where is Chetan Ambastha located?
Chetan Ambastha practices at 300 Pasteur Dr, Stanford, CA 94305. The listed phone number is (650) 723-4000.
What is Chetan Ambastha's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Chetan Ambastha enrolled in Medicare?
Yes. Chetan Ambastha is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Chetan Ambastha's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Chetan Ambastha 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 Chetan Ambastha'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 Chetan Ambastha was last updated on July 7, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 months 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.
# Chetan Giri Ambastha, MD · NPI 1275279648
Internal Medicine physician in Stanford, California. Individual provider, active in the CMS NPPES registry since May 9, 2022.
## Identity
- **NPI:** 1275279648 (Entity type: Individual)
- **Enumerated:** May 9, 2022
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** A190131 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 300 PASTEUR DR, Stanford, CA 94305-2200
- **Phone:** (650) 723-4000
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for durable medical equipment, 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:** Washington University School Of Medicine, class of 2022
## Record status
- **NPPES last updated:** July 7, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1275279648) · Data from the CMS NPPES public registry.