Joanne Chien, NP
NPI 1629399449 · Nurse Practitioner · Stanford, CA
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Joanne Chien, NP is a Nurse Practitioner provider in Stanford, CA (NPI 1629399449).
Provider details
- NPI number
- 1629399449
- Entity type
- Individual
- Primary specialty
- Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- NP
- Sex
- Female
- Sole proprietor
- No
- License
- 18364 (CA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
16 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
733 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 High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 424 | $184 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 118 | $139 |
| 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 | 99 | $16 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 36 | $132 |
| 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 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 29 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Abiraterone Acetate | 400 | 62 |
| Prednisone | 346 | 78 |
| Cabozantinib S-Malatebrand: Cabometyx | 96 | — |
| Tamsulosin Hcl | 73 | 26 |
| Apixabanbrand: Eliquis | 60 | 14 |
| Enzalutamidebrand: Xtandi | 44 | — |
| Darolutamidebrand: Nubeqa | 36 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$327 across 3 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)
- 1765 Fumia CtSan Jose, CA 95131-1612Phone: (408) 859-4436
Registry dates
- Enumerated
- 2010-06-16
- Last updated
- 2025-12-30
- Certified
- 2025-12-30
Frequently asked questions
- What is Joanne Chien's NPI number?
- Joanne Chien's National Provider Identifier (NPI) is 1629399449, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Joanne Chien's specialty?
- Joanne Chien is listed in the NPPES registry with a primary specialty of Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Joanne Chien located?
- Joanne Chien's practice location on file with NPPES is 300 Pasteur Dr, Stanford, CA 94305-2200.
- What is Joanne Chien's phone number?
- The practice phone number listed in the NPPES registry for Joanne Chien is (650) 723-4000.
- Does Joanne Chien accept Medicare?
- Joanne Chien is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Joanne Chien's NPI active?
- Yes — Joanne Chien's NPI (1629399449) is active in the NPPES registry as of the last update on 2025-12-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.