Fiona Yuen, M.D.
NPI 1649513599 · Endocrinology, Diabetes & Metabolism Physician · Walnut Creek, CA
Enrolled with Medicare as Practitioner - Endocrinology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Fiona Yuen, M.D. is a Endocrinology, Diabetes & Metabolism Physician provider in Walnut Creek, CA (NPI 1649513599).
Provider details
- NPI number
- 1649513599
- Entity type
- Individual
- Primary specialty
- Endocrinology, Diabetes & Metabolism PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- A133721 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
13 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
1,686 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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 | 758 | $154 |
| 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 | 294 | $19 |
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 | 220 | $18 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 180 | $197 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 132 | $110 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 66 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levothyroxine Sodium | 442 | 137 |
| Semaglutidebrand: Ozempic | 343 | 72 |
| Metformin Hclbrand: Metformin Hcl Er | 208 | 76 |
| Insulin Glargine,hum.rec.anlogbrand: Lantus Solostar | 207 | 76 |
| Alendronate Sodium | 191 | 68 |
| Empagliflozinbrand: Jardiance | 179 | 52 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,597 across 59 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (1)
- 2400 Balfour Rd Ste 201Brentwood, CA 94513-4952Phone: (925) 308-8112
Registry dates
- Enumerated
- 2013-03-28
- Last updated
- 2023-11-20
- Certified
- 2023-11-20
Frequently asked questions
- What is Fiona Yuen's NPI number?
- Fiona Yuen's National Provider Identifier (NPI) is 1649513599, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Fiona Yuen's specialty?
- Fiona Yuen is listed in the NPPES registry with a primary specialty of Endocrinology, Diabetes & Metabolism Physician (Allopathic & Osteopathic Physicians).
- Where is Fiona Yuen located?
- Fiona Yuen's practice location on file with NPPES is 1450 Treat Blvd # 200, Walnut Creek, CA 94597-2168.
- What is Fiona Yuen's phone number?
- The practice phone number listed in the NPPES registry for Fiona Yuen is (925) 296-9702.
- Does Fiona Yuen accept Medicare?
- Fiona Yuen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Fiona Yuen's NPI active?
- Yes — Fiona Yuen's NPI (1649513599) is active in the NPPES registry as of the last update on 2023-11-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.