Sidney Chan, MD
NPI 1427136522 · Diagnostic Radiology Physician · Walnut Creek, CA
Enrolled with Medicare as Practitioner - Diagnostic Radiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Sidney Chan, MD is a Diagnostic Radiology Physician provider in Walnut Creek, CA (NPI 1427136522).
Provider details
- NPI number
- 1427136522
- Entity type
- Individual
- Primary specialty
- Diagnostic Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A65087 (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
19 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
180 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) |
|---|---|---|
| X-Ray of Chest, 1 View71045 | 73 | $9 |
| X-Ray of Chest, 2 Views71046 | 32 | $11 |
| X-Ray of Chest, 2 Views71046 | 24 | $23 |
| Ct Scan Head Or Brain Without Contrast70450 | 22 | $43 |
| X-Ray of Foot, Minimum of 3 Views73630 | 16 | $9 |
| Ct Scan of Abdomen and Pelvis With Contrast74177 | 13 | $96 |
Typical Medicare-allowed amounts for these services range $9–$96 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, 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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-11-02
- Last updated
- 2021-12-17
Frequently asked questions
- What is Sidney Chan's NPI number?
- Sidney Chan's National Provider Identifier (NPI) is 1427136522, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Sidney Chan's specialty?
- Sidney Chan is listed in the NPPES registry with a primary specialty of Diagnostic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is Sidney Chan located?
- Sidney Chan's practice location on file with NPPES is 1425 S Main St, Walnut Creek, CA 94596-5318.
- What is Sidney Chan's phone number?
- The practice phone number listed in the NPPES registry for Sidney Chan is (925) 295-4000.
- Does Sidney Chan accept Medicare?
- Sidney Chan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Sidney Chan's NPI active?
- Yes — Sidney Chan's NPI (1427136522) is active in the NPPES registry as of the last update on 2021-12-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.