Quick answers
- Does Tiffany L. Shay Alexander accept Medicare assignment?
- Yes. Medicare's clinician data says Tiffany L. Shay Alexander 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 Tiffany L. Shay Alexander see?
- In 2024, CMS data shows 280 Original Medicare patients and 854 services for Tiffany L. Shay Alexander. This counts Original Medicare only and measures volume, not quality.
- What is Tiffany L. Shay Alexander's NPI number?
- 1346253903. 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 Tiffany L. Shay Alexander, 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 | 280 |
|---|---|
| Services billed to Medicare | 854 |
| Different services or procedures | 7 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Administration of influenza virus vaccine (G0008)248 services
- Admn sarscov2 vacc 1 dose (90480)179 services
- Sarscov2 vac 50 mcg/0.5ml im (91322)179 services
- Influenza vaccine, inactivated (90653)170 services
- Influenza vaccine split virus, preservative free (90662)58 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 cholesterol71%
- High blood pressure68%
- Diabetes36%
- Arthritis32%
- Chronic kidney disease21%
- Ischemic heart disease17%
Practice locations
Addresses where Tiffany L. Shay Alexander is enrolled with Medicare (CMS data updated October 2, 2026).
- 16950 Via TazonSan Diego, CA 92127 (858) 499‑2600
Group practices
Medicare enrollment lists Tiffany L. Shay Alexander as a member of this group (CMS data updated October 2, 2026).
- Sharp Rees-Stealy Medical Group Inc884 clinicians in the group
Specialties
- Preventive Medicineprimary
Other preventive medicine doctors in San Diego
Clinicians with the same Medicare primary specialty in San Diego, CA — not a recommendation.
Other clinicians in Sharp Rees-Stealy Medical Group Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1997 (29 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1346253903 |
| 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