Quick answers
- Does Mai-Chi M. Tieu accept Medicare assignment?
- Medicare's clinician data says Mai-Chi M. Tieu may accept Medicare assignment (as of October 2, 2026). Ask the office whether they accept it for your visit.
- How many Medicare patients does Mai-Chi M. Tieu see?
- In 2024, CMS data shows 45 Original Medicare patients and 290 services for Mai-Chi M. Tieu. This counts Original Medicare only and measures volume, not quality.
- What is Mai-Chi M. Tieu's NPI number?
- 1679974539. 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-Chi M. Tieu, 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 | 45 |
|---|---|
| Services billed to Medicare | 290 |
| Different services or procedures | 13 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Residence visit for established patient with moderate level of medical decision making, per day, if using time, at least 40 minutes (99349)88 services
- Residence visit for established patient with high level of medical decision making, per day, if using time, at least 60 minutes (99350)69 services
- Residence visit for established patient with low level of medical decision making, per day, if using time, at least 30 minutes (99348)43 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)17 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 blood pressure62%
- High cholesterol60%
- Depression56%
- Anxiety47%
- Diabetes38%
- Arthritis36%
Practice locations
Addresses where Mai-Chi M. Tieu is enrolled with Medicare (CMS data updated October 2, 2026).
- 1500 Franklin StSan Francisco, CA 94109 (415) 474‑7310
- 6221 Geary BlvdSan Francisco, CA 94121 (415) 386‑6600
Group practices
Medicare enrollment lists Mai-Chi M. Tieu as a member of this group (CMS data updated October 2, 2026).
- Felton Institute14 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in San Francisco
Clinicians with the same Medicare primary specialty in San Francisco, CA — not a recommendation.
Other clinicians in Felton Institute
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 2015 |
| Gender (as listed) | Female |
| Medicare assignment | May accept for some services |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1679974539 |
| 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