Ryan Chao, MD
NPI 1235471608 · Vascular & Interventional Radiology Physician · Stanford, CA
Enrolled with Medicare as Practitioner - Diagnostic Radiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ryan Chao, MD is a Vascular & Interventional Radiology Physician provider in Stanford, CA (NPI 1235471608).
Provider details
- NPI number
- 1235471608
- Entity type
- Individual
- Primary specialty
- Vascular & Interventional Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A131676 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
13 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
3 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
2,381 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 | 839 | $9 |
| X-Ray of Chest, 2 Views71046 | 123 | $12 |
| Ultrasound Study of One Arm Or Leg Veins With Compression and Maneuvers93971 | 112 | $23 |
| Ct Scan of Abdomen and Pelvis With Contrast74177 | 110 | $96 |
| Use of a Drug to Induce Depression of Consciousness By Physician Performing a Procedure (5 Years Or Older), Initial 15 Minutes99152 | 94 | $13 |
| X-Ray of Knee, 1-2 Views73560 | 81 | $9 |
Practice location
Mailing address
Additional practice locations (2)
- 5555 W Las Positas BlvdPleasanton, CA 94588-4000Phone: (925) 734-3376
- 751 S Bascom AveSan Jose, CA 95128-2604Phone: (408) 885-5110
Registry dates
- Enumerated
- 2013-03-22
- Last updated
- 2024-04-05
- Certified
- 2024-04-05
Frequently asked questions
- What is Ryan Chao's NPI number?
- Ryan Chao's National Provider Identifier (NPI) is 1235471608, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ryan Chao's specialty?
- Ryan Chao is listed in the NPPES registry with a primary specialty of Vascular & Interventional Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is Ryan Chao located?
- Ryan Chao's practice location on file with NPPES is 300 Pasteur Dr, Stanford, CA 94305-2200.
- What is Ryan Chao's phone number?
- The practice phone number listed in the NPPES registry for Ryan Chao is (650) 723-4000.
- Does Ryan Chao accept Medicare?
- Ryan Chao is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ryan Chao's NPI active?
- Yes — Ryan Chao's NPI (1235471608) is active in the NPPES registry as of the last update on 2024-04-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.