Chau Chien, MD
NPI 1578503462 · Neurology Physician · San Francisco, CA
Enrolled with Medicare as Practitioner - Neurology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Chau Chien, MD is a Neurology Physician provider in San Francisco, CA (NPI 1578503462).
Provider details
- NPI number
- 1578503462
- Entity type
- Individual
- Primary specialty
- Neurology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A45801 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
120 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 | 64 | $154 |
| Established Patient Office Or Other Outpatient Visit With Straightforward Medical Decision Making, If Using Time, 10 Minutes Or More99212 | 35 | $69 |
| New Patient Office Or Other Outpatient Visit With a High Level of Medical Decision Making, If Using Time, 60 Minutes Or More99205 | 21 | $259 |
Typical Medicare-allowed amounts for these services range $69–$259 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 14 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Memantine Hcl | 245 | 82 |
| Gabapentin | 99 | 56 |
| Carbidopa/Levodopabrand: Carbidopa-Levodopa Er | 84 | 29 |
| Levetiracetam | 45 | 15 |
| Carbidopa/Levodopabrand: Carbidopa-Levodopa | 24 | — |
| Selegiline Hcl | 22 | — |
| Donepezil Hcl | 20 | — |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-06-07
- Last updated
- 2017-10-11
Frequently asked questions
- What is Chau Chien's NPI number?
- Chau Chien's National Provider Identifier (NPI) is 1578503462, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Chau Chien's specialty?
- Chau Chien is listed in the NPPES registry with a primary specialty of Neurology Physician (Allopathic & Osteopathic Physicians).
- Where is Chau Chien located?
- Chau Chien's practice location on file with NPPES is 3115 Geary Blvd, San Francisco, CA 94118-3316.
- What is Chau Chien's phone number?
- The practice phone number listed in the NPPES registry for Chau Chien is (415) 981-6013.
- Does Chau Chien accept Medicare?
- Chau Chien is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Chau Chien's NPI active?
- Yes — Chau Chien's NPI (1578503462) is active in the NPPES registry as of the last update on 2017-10-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.