Joseph Chao, M.D.
NPI 1992891493 · Cardiovascular Disease Physician · Mountain View, CA
Enrolled with Medicare as Practitioner - Cardiovascular Disease (cardiology) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Joseph Chao, M.D. is a Cardiovascular Disease Physician provider in Mountain View, CA (NPI 1992891493).
Provider details
- NPI number
- 1992891493
- Entity type
- Individual
- Primary specialty
- Cardiovascular Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- A45961 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 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
1,247 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 | 350 | $144 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report93000 | 267 | $15 |
| Ultrasound of Heart With Color-Depicted Blood Flow, Rate, Direction and Valve Function93306 | 254 | $198 |
| Ultrasound of Both Sides of Head and Neck Blood Flow93880 | 253 | $237 |
| Ultrasound of Heart With Continuous Electrocardiogram (ecg) During Rest, Exercise And/Or Drug Induced Stress With Review and Report93351 | 82 | $282 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More |
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 |
|---|---|---|
| Rosuvastatin Calcium | 244 | 89 |
| Metoprolol Succinate | 47 | 15 |
| Atorvastatin Calcium | 32 | — |
| Apixabanbrand: Eliquis | 30 | — |
| Metformin Hcl | 30 | — |
| Atenolol | 24 | — |
| Clopidogrel Bisulfate |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,778 across 51 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)
- 300 Pasteur DrStanford, CA 94305-2200Phone: (650) 723-4000
Registry dates
- Enumerated
- 2006-10-04
- Last updated
- 2024-04-15
- Certified
- 2024-04-15
Frequently asked questions
- What is Joseph Chao's NPI number?
- Joseph Chao's National Provider Identifier (NPI) is 1992891493, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Joseph Chao's specialty?
- Joseph Chao is listed in the NPPES registry with a primary specialty of Cardiovascular Disease Physician (Allopathic & Osteopathic Physicians).
- Where is Joseph Chao located?
- Joseph Chao's practice location on file with NPPES is 525 South Drive, Mountain View, CA 94040-4211.
- What is Joseph Chao's phone number?
- The practice phone number listed in the NPPES registry for Joseph Chao is (650) 962-0242.
- Does Joseph Chao accept Medicare?
- Joseph Chao is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Joseph Chao's NPI active?
- Yes — Joseph Chao's NPI (1992891493) is active in the NPPES registry as of the last update on 2024-04-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.