DR. NATHANIEL HAMILTON FLEMING MD, MS
NPI 1316400245
Psychiatry & Neurology - Neurology in San Francisco, CA
About Dr. Nathaniel Hamilton Fleming Md, Ms NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. NATHANIEL HAMILTON FLEMING MD, MS (NPI 1316400245) is an individual neurology provider in San Francisco, California, licensed in California (A177834) and active in the NPI registry since April 2019. He is enrolled in Medicare PECOS and is a graduate of Stanford University School Of Medicine (2019).
NPPES Registry Identity
Specialties & Licenses
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
Dr. Nathaniel Hamilton Fleming Md, Ms 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 Nathaniel Fleming reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
San Francisco, CA 94143
- Reassigned Medicare billing, California enrollment
- 5,645 clinicians in this Medicare group
San Francisco, CA 94122
- Reassigned Medicare billing, California enrollment
- 5,544 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
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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 94143 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.
SAN FRANCISCO, CA 94143
SAN FRANCISCO, CA 94143
SAN FRANCISCO, CA 94143
SAN FRANCISCO, CA 94143
SAN FRANCISCO, CA 94143
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 Fleming's NPI number?
The NPI number for Nathaniel Fleming is 1316400245. It was assigned to this individual provider in the NPPES registry on April 8, 2019.
Where is Nathaniel Fleming located?
Nathaniel Fleming practices at 505 Parnassus Ave, San Francisco, CA 94143. The listed phone number is (415) 476-1000.
What is Nathaniel Fleming's specialty?
The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Neurology, with taxonomy code 2084N0400X.
Is Nathaniel Fleming enrolled in Medicare?
Yes. Nathaniel Fleming 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 Fleming's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Nathaniel Fleming reassigns Medicare benefits to 2 organizations: University Of California San Francisco (San Francisco, CA) and Ucsf Medical Group Business Services (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 Fleming'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 Fleming was last updated on June 13, 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.
# Dr. Nathaniel Hamilton Fleming, MD, MS · NPI 1316400245
Neurology physician in San Francisco, California. Individual provider, active in the CMS NPPES registry since April 8, 2019.
## Identity
- **NPI:** 1316400245 (Entity type: Individual)
- **Enumerated:** April 8, 2019
- **Primary specialty:** Psychiatry & Neurology - Neurology · taxonomy 2084N0400X
- **State license:** A177834 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 505 PARNASSUS AVE, San Francisco, CA 94143
- **Phone:** (415) 476-1000
## 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): University Of California San Francisco (NPI 1346329380, San Francisco, CA); Ucsf Medical Group Business Services (NPI 1477624104, San Francisco, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Stanford University School Of Medicine, class of 2019
## Record status
- **NPPES last updated:** June 13, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1316400245) · Data from the CMS NPPES public registry.