MR. NATHANIEL ALAN PONSTEIN M.D.
NPI 1114123775
Anesthesiology in Stanford, CA
About Mr. Nathaniel Alan Ponstein M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MR. NATHANIEL ALAN PONSTEIN M.D. (NPI 1114123775) is an individual anesthesiology provider in Stanford, California, licensed in California (A108136) and active in the NPI registry since June 2007. He is enrolled in Medicare PECOS and is a graduate of Michigan State University College Of Human Medicine (2000).
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
Mr. Nathaniel Alan Ponstein M.d. 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
3Medicare enrollment records show Nathaniel Ponstein reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Palo Alto, CA 94301
- Reassigned Medicare billing, California enrollment
- Also billed through NPI 1033817168 (California)
- 4,479 clinicians in this Medicare group
Palo Alto, CA 94306
- Reassigned Medicare billing, California enrollment
- 2,460 clinicians in this Medicare group
San Francisco, CA 94109
- Reassigned Medicare billing, California enrollment
- 20 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 8
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.
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 Nathaniel Ponstein's NPI number?
The NPI number for Nathaniel Ponstein is 1114123775. It was assigned to this individual provider in the NPPES registry on June 21, 2007.
Where is Nathaniel Ponstein located?
Nathaniel Ponstein practices at 300 Pasteur Dr, Stanford, CA 94305. The listed phone number is (650) 723-4000.
What is Nathaniel Ponstein's specialty?
The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.
Is Nathaniel Ponstein enrolled in Medicare?
Yes. Nathaniel Ponstein 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 Nathaniel Ponstein's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Nathaniel Ponstein reassigns Medicare benefits to 3 organizations: Sutter Bay Medical Foundation (Palo Alto, CA), County Of Santa Clara (Palo Alto, CA) and Anesthesiologists' Medical Group Of San Francisco, Inc. (San Francisco, 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 Nathaniel Ponstein'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 Nathaniel Ponstein was last updated on June 8, 2011. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 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.
# Mr. Nathaniel Alan Ponstein, M.D. · NPI 1114123775
Anesthesiology physician in Stanford, California. Individual provider, active in the CMS NPPES registry since June 21, 2007.
## Identity
- **NPI:** 1114123775 (Entity type: Individual)
- **Enumerated:** June 21, 2007
- **Primary specialty:** Anesthesiology · taxonomy 207L00000X
- **State license:** A108136 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 300 PASTEUR DR, Stanford, CA 94305-2200
- **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:** 3 organizations under Medicare reassignment (form CMS-855R): Sutter Bay Medical Foundation (NPI 1013950807, Palo Alto, CA); County Of Santa Clara (NPI 1144330614, Palo Alto, CA); Anesthesiologists' Medical Group Of San Francisco, Inc. (NPI 1154379436, San Francisco, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Michigan State University College Of Human Medicine, class of 2000
## Record status
- **NPPES last updated:** June 8, 2011
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Source: [NPI Profile](https://npiprofile.com/npi/1114123775) · Data from the CMS NPPES public registry.