Frances Xu, MD
NPI 1588161624 · Family Medicine Physician · San Mateo, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Frances Xu, MD is a Family Medicine Physician provider in San Mateo, CA (NPI 1588161624).
Provider details
- NPI number
- 1588161624
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
8 yrs in NPPES registry
- Profile completeness28% of score
83% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
424 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 240 | $153 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 75 | $156 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 36 | $19 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 32 | $109 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 26 | $210 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 49 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 169 | 62 |
| Amlodipine Besylate | 109 | 37 |
| Levothyroxine Sodium | 106 | 31 |
| Losartan Potassium | 87 | 29 |
| Lisinopril | 75 | 21 |
| Alendronate Sodium | 61 | 18 |
| Rosuvastatin Calcium |
Practice location
Mailing address
Registry dates
- Enumerated
- 2018-04-06
- Last updated
- 2021-08-25
- Certified
- 2021-08-25
Frequently asked questions
- What is Frances Xu's NPI number?
- Frances Xu's National Provider Identifier (NPI) is 1588161624, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Frances Xu's specialty?
- Frances Xu is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Frances Xu located?
- Frances Xu's practice location on file with NPPES is 50 S San Mateo Dr, San Mateo, CA 94401-3857.
- What is Frances Xu's phone number?
- The practice phone number listed in the NPPES registry for Frances Xu is (650) 652-7044.
- Does Frances Xu accept Medicare?
- Frances Xu is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Frances Xu's NPI active?
- Yes — Frances Xu's NPI (1588161624) is active in the NPPES registry as of the last update on 2021-08-25.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.