Quick answers
- Does H G. Tanaka accept Medicare assignment?
- Yes. Medicare's clinician data says H G. Tanaka 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 H G. Tanaka see?
- In 2024, CMS data shows 417 Original Medicare patients and 1,819 services for H G. Tanaka. This counts Original Medicare only and measures volume, not quality.
- What is H G. Tanaka's NPI number?
- 1285723411. 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 H G. Tanaka, 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 | 417 |
|---|---|
| Services billed to Medicare | 1,819 |
| Different services or procedures | 64 |
| Participating Medicare provider | Yes |
| Average age of these patients | 78 |
Most frequent services
- Established patient problem focused exam of visual system (92012)634 services
- Exam of visual field with extended testing (92083)267 services
- Imaging of optic nerve (92133)154 services
- Established patient complete exam of visual system (92014)104 services
- Exam of the internal drainage system of eye (92020)102 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 cholesterol73%
- High blood pressure65%
- Arthritis37%
- Diabetes24%
- Ischemic heart disease19%
- Osteoporosis19%
Hospitals where H G. Tanaka works
Medicare's Facility Affiliation Data lists H G. Tanaka at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- California Pacific Medical Center- Van Ness CampusSan Francisco, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050047
Practice locations
Addresses where H G. Tanaka is enrolled with Medicare (CMS data updated October 2, 2026).
- 491 30th St, Suite 103Oakland, CA 94609 (510) 763‑9775
Specialties
- Ophthalmologyprimary
Other ophthalmologists in Oakland
Clinicians with the same Medicare primary specialty in Oakland, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Harvard Medical School |
| Graduation year | 1992 (34 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1285723411 |
| 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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- 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