Quick answers
- Does Christos Theophanous accept Medicare assignment?
- Yes. Medicare's clinician data says Christos Theophanous 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 Christos Theophanous see?
- In 2024, CMS data shows 787 Original Medicare patients and 2,732 services for Christos Theophanous. This counts Original Medicare only and measures volume, not quality.
- What is Christos Theophanous's NPI number?
- 1134582356. 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 Christos Theophanous, 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 | 787 |
|---|---|
| Services billed to Medicare | 2,732 |
| Different services or procedures | 34 |
| Participating Medicare provider | Yes |
| Average age of these patients | 77 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)684 services
- Imaging of optic nerve (92133)299 services
- Exam of visual field with extended testing (92083)259 services
- Removal of cataract with insertion of prosthetic lens (66984)243 services
- Measurement of corneal curvature and depth of eye (92136)226 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 cholesterol70%
- High blood pressure59%
- Arthritis31%
- Osteoporosis24%
- Diabetes21%
- Ischemic heart disease21%
Practice locations
Addresses where Christos Theophanous is enrolled with Medicare (CMS data updated October 2, 2026).
- 123 S San Mateo DrSan Mateo, CA 94401 (650) 343‑4200
- 301 Industrial RdSan Carlos, CA 94070
- 795 El Camino RealPalo Alto, CA 94301 (415) 600‑1020
Group practices
Medicare enrollment lists Christos Theophanous as a member of this group (CMS data updated October 2, 2026).
- Sutter Bay Medical Foundation3,829 clinicians in the group
Specialties
- Ophthalmologyprimary
Other ophthalmologists in San Mateo
Clinicians with the same Medicare primary specialty in San Mateo, CA — not a recommendation.
Other clinicians in Sutter Bay Medical Foundation
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2016 (10 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1134582356 |
| 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