Quick answers
- Does Mai T. Pham accept Medicare assignment?
- Yes. Medicare's clinician data says Mai T. Pham 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 Mai T. Pham see?
- In 2024, CMS data shows 518 Original Medicare patients and 1,908 services for Mai T. Pham. This counts Original Medicare only and measures volume, not quality.
- What is Mai T. Pham's NPI number?
- 1912171703. 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 Mai T. Pham, 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 | 518 |
|---|---|
| Services billed to Medicare | 1,908 |
| Different services or procedures | 25 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Established patient complete exam of visual system (92014)452 services
- Established patient problem focused exam of visual system (92012)418 services
- Imaging of optic nerve (92133)303 services
- Exam of visual field with extended testing (92083)146 services
- Imaging of retina (92134)139 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 cholesterol75%
- High blood pressure67%
- Arthritis48%
- Diabetes30%
- Osteoporosis25%
- Chronic kidney disease20%
Hospitals where Mai T. Pham works
Medicare's Facility Affiliation Data lists Mai T. Pham 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.
- Providence St. Jude Medical CenterFullerton, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050168
Practice locations
Addresses where Mai T. Pham is enrolled with Medicare (CMS data updated October 2, 2026).
- 265 Laguna RdFullerton, CA 92835 (714) 871‑2570
Group practices
Medicare enrollment lists Mai T. Pham as a member of this group (CMS data updated October 2, 2026).
- William D Mosier MD Inc a Professional Medical Corporation3 clinicians in the group
Specialties
- Ophthalmologyprimary
Other ophthalmologists in Fullerton
Clinicians with the same Medicare primary specialty in Fullerton, CA — not a recommendation.
Other clinicians in William D Mosier MD Inc a Professional Medical Corporation
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Boston University School Of Medicine |
| Graduation year | 2008 (18 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1912171703 |
| 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