ALEXANDER GENG INC
NPI 1992394811
Radiology - Radiation Oncology in San Francisco, CA
About Alexander Geng Inc NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ALEXANDER GENG INC (NPI 1992394811) is a healthcare organization registered as a radiation oncology in San Francisco, California and active in the NPI registry since January 2021. The organization lists Alexander B Geng, Physician/owner, as its authorized official.
NPPES Registry Identity
Specialties & Licenses
Group Practice 1
Medicare Participation & PECOS CMS
Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Alexander Geng Inc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Clinicians Billing Medicare Through This Organization
Medicare enrollment records show 1 clinician reassigns Medicare billing to Alexander Geng Inc, which bills Medicare for the services this clinician delivers.
Clinician (1)
San Francisco, CA 94109
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
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 Alexander Geng Inc's NPI number?
The NPI number for Alexander Geng Inc is 1992394811. It was assigned to this organization in the NPPES registry on January 14, 2021.
Where is Alexander Geng Inc located?
Alexander Geng Inc is located at 900 Hyde St, San Francisco, CA 94109. The listed phone number is (415) 353-6420.
What is Alexander Geng Inc's specialty?
The primary specialty registered for this NPI is Radiology, specializing in Radiation Oncology, with taxonomy code 2085R0001X.
Is Alexander Geng Inc enrolled in Medicare?
Yes. Alexander Geng Inc is registered in the Medicare PECOS enrollment system.
How many clinicians bill Medicare through Alexander Geng Inc?
According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Radiation Oncology) reassigns their Medicare billing to Alexander Geng Inc. A 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 the clinician's services. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
When was this NPI record last updated?
The NPPES record for Alexander Geng Inc was last updated on January 14, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.
# Alexander Geng Inc · NPI 1992394811
Radiation Oncology organization in San Francisco, California. Organization record, active in the CMS NPPES registry since January 14, 2021.
## Identity
- **NPI:** 1992394811 (Entity type: Organization)
- **Enumerated:** January 14, 2021
- **Primary specialty:** Radiology - Radiation Oncology · taxonomy 2085R0001X
- **Organization subpart:** No
- **Authorized official:** Alexander Geng, PHYSICIAN/OWNER
## Practice location
- **Address:** 900 HYDE ST, San Francisco, CA 94109-4806
- **Phone:** (415) 353-6420 · **Fax:** (415) 353-6259
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Clinicians billing through this organization:** 1 clinician (Radiation Oncology) reassigns Medicare billing to this organization (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** January 14, 2021
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Source: [NPI Profile](https://npiprofile.com/npi/1992394811) · Data from the CMS NPPES public registry.