ANDREW G. IWACH MD A PROFESSIONAL CORPORATION
NPI 1598834632
Orthopaedic Surgery in San Francisco, CA
About Andrew G. Iwach Md A Professional Corporation NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ANDREW G. IWACH MD A PROFESSIONAL CORPORATION (NPI 1598834632), doing business as Glaucoma Associates Of Northern California, is a healthcare organization registered as an orthopaedic surgery in San Francisco, California and active in the NPI registry since November 2006. The organization lists Andrew Iwach, Owner, as its authorized official.
NPPES Registry Identity
Specialties & Licenses 2
Other Names 1
Other Identifiers 1
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)
Andrew G. Iwach Md A Professional Corporation is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Clinicians Billing Medicare Through This Organization
4Medicare enrollment records show 4 clinicians reassign Medicare billing to Andrew G. Iwach MD A Professional Corporation, which bills Medicare for the services they deliver. Of these, 3 practice at this address and 4 within 10 miles. They are listed nearest first.
Clinicians, nearest first (4)
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 Andrew G. Iwach MD A Professional Corporation's NPI number?
The NPI number for Andrew G. Iwach MD A Professional Corporation is 1598834632. It was assigned to this organization in the NPPES registry on November 6, 2006. The provider is doing business as Glaucoma Associates of Northern California.
Where is Andrew G. Iwach MD A Professional Corporation located?
Andrew G. Iwach MD A Professional Corporation is located at 55 Stevenson St, San Francisco, CA 94105. The listed phone number is (415) 981-2020.
What is Andrew G. Iwach MD A Professional Corporation's specialty?
The primary specialty registered for this NPI is Orthopaedic Surgery with taxonomy code 207X00000X.
Is Andrew G. Iwach MD A Professional Corporation enrolled in Medicare?
Yes. Andrew G. Iwach MD A Professional Corporation is registered in the Medicare PECOS enrollment system.
How many clinicians bill Medicare through Andrew G. Iwach MD A Professional Corporation?
According to the CMS Revalidation Reassignment List (October 2026 release), 4 clinicians, all in Ophthalmology, reassign their Medicare billing to Andrew G. Iwach MD A Professional Corporation. 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. Of these, 3 practice at this address and 4 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
When was this NPI record last updated?
The NPPES record for Andrew G. Iwach MD A Professional Corporation was last updated on August 3, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.
# Andrew G. Iwach Md A Professional Corporation · NPI 1598834632
Orthopaedic Surgery organization in San Francisco, California. Organization record, active in the CMS NPPES registry since November 6, 2006.
## Identity
- **NPI:** 1598834632 (Entity type: Organization)
- **Enumerated:** November 6, 2006
- **Primary specialty:** Orthopaedic Surgery · taxonomy 207X00000X
- **Also known as:** Glaucoma Associates of Northern California (Doing Business As)
- **Organization subpart:** No
- **Authorized official:** Andrew Iwach, OWNER
## Practice location
- **Address:** 55 STEVENSON ST, San Francisco, CA 94105-2936
- **Phone:** (415) 981-2020 · **Fax:** (415) 981-2019
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Clinicians billing through this organization:** 4 clinicians (Ophthalmology) reassign Medicare billing to this organization (form CMS-855R); 3 practice at this address and 4 within 10 miles · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** August 3, 2026
- **Other identifiers:** Medicaid 00G561420 (CA)
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Source: [NPI Profile](https://npiprofile.com/npi/1598834632) · Data from the CMS NPPES public registry.