DR. NATHANIEL WILLIAM GLEASON M.D.
NPI 1861727547
Internal Medicine in San Francisco, CA
About Dr. Nathaniel William Gleason M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. NATHANIEL WILLIAM GLEASON M.D. (NPI 1861727547) is an individual internal medicine provider in San Francisco, California, licensed in California (A110528) and active in the NPI registry since October 2009. He is enrolled in Medicare PECOS.
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 (PECOS)
Dr. Nathaniel William Gleason M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
3Medicare enrollment records show Nathaniel Gleason reassigns Medicare billing to 3 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
- 2,112 clinicians in this Medicare group
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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 94115 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 94115
SAN FRANCISCO, CA 94115
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 Gleason's NPI number?
The NPI number for Nathaniel Gleason is 1861727547. It was assigned to this individual provider in the NPPES registry on October 13, 2009.
Where is Nathaniel Gleason located?
Nathaniel Gleason practices at 1701 Divisadero St Suite 500, San Francisco, CA 94115. The listed phone number is (415) 353-7999.
What is Nathaniel Gleason's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Nathaniel Gleason enrolled in Medicare?
Yes. Nathaniel Gleason is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Nathaniel Gleason's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Nathaniel Gleason reassigns Medicare benefits to 3 organizations: Regents Of The University Of California (San Francisco, CA), 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 Gleason'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 Gleason was last updated on September 2, 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.
# Dr. Nathaniel William Gleason, M.D. · NPI 1861727547
Internal Medicine physician in San Francisco, California. Individual provider, active in the CMS NPPES registry since October 13, 2009.
## Identity
- **NPI:** 1861727547 (Entity type: Individual)
- **Enumerated:** October 13, 2009
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** A110528 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 1701 DIVISADERO ST, SUITE 500, San Francisco, CA 94115-3011
- **Phone:** (415) 353-7999
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **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): Regents Of The University Of California (NPI 1235322348, San Francisco, CA); 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
## Record status
- **NPPES last updated:** September 2, 2011
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Source: [NPI Profile](https://npiprofile.com/npi/1861727547) · Data from the CMS NPPES public registry.