Quick answers
- Does Andrew G. Iwach accept Medicare assignment?
- Yes. Medicare's clinician data says Andrew G. Iwach accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Andrew G. Iwach see?
- In 2024, CMS data shows 1,054 Original Medicare patients and 5,427 services for Andrew G. Iwach. This counts Original Medicare only and measures volume, not quality.
- What is Andrew G. Iwach's NPI number?
- 1871682088. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Andrew G. Iwach, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 1,054 |
|---|---|
| Services billed to Medicare | 5,427 |
| Different services or procedures | 30 |
| Participating Medicare provider | Yes |
| Average age of these patients | 78 |
Most frequent services
- Established patient problem focused exam of visual system (92012)1,493 services
- Imaging of optic nerve (92133)1,238 services
- Exam of visual field with extended testing (92083)1,081 services
- Established patient complete exam of visual system (92014)742 services
- Exam of the internal drainage system of eye (92020)290 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High cholesterol74%
- High blood pressure60%
- Arthritis34%
- Diabetes25%
- Ischemic heart disease22%
- Osteoporosis19%
Practice locations
Addresses where Andrew G. Iwach is enrolled with Medicare (CMS data updated October 2, 2026).
- 55 Stevenson StSan Francisco, CA 94105 (415) 981‑2020
Group practices
Medicare enrollment lists Andrew G. Iwach as a member of this group (CMS data updated October 2, 2026).
- Andrew G Iwach MD a Professional Corporation3 clinicians in the group
Specialties
- Ophthalmologyprimary
Other ophthalmologists in San Francisco
Clinicians with the same Medicare primary specialty in San Francisco, CA — not a recommendation.
Other clinicians in Andrew G Iwach MD a Professional Corporation
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of California, Geffen School Of Medicine |
| Graduation year | 1980 (46 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1871682088 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians