William Mullen, MD
NPI 1457362329 · Cardiovascular Disease Physician · Santa Clara, CA
Enrolled with Medicare as Practitioner - Cardiovascular Disease (cardiology) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Mullen, MD is a Cardiovascular Disease Physician provider in Santa Clara, CA (NPI 1457362329).
Provider details
- NPI number
- 1457362329
- Entity type
- Individual
- Primary specialty
- Cardiovascular Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A43317 (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
1,469 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 | 423 | $125 |
| Ultrasound of Heart With Color-Depicted Blood Flow, Rate, Direction and Valve Function93306 | 407 | $66 |
| Evaluation of Single, Dual, Multiple Lead Or Leadless Pacemaker System, Remote Up to 90 Days93294 | 135 | $28 |
| New Patient Office Or Other Outpatient Visit With a High Level of Medical Decision Making, If Using Time, 60 Minutes Or More99205 | 90 | $215 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report93000 | 80 | $14 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 31 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Metoprolol Succinate | 248 | 79 |
| Atorvastatin Calcium | 209 | 68 |
| Apixabanbrand: Eliquis | 198 | 48 |
| Losartan Potassium | 144 | 50 |
| Rosuvastatin Calcium | 129 | 46 |
| Evolocumabbrand: Repatha Sureclick | 106 | 17 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-08-10
- Last updated
- 2025-10-22
- Certified
- 2025-10-22
Frequently asked questions
- What is William Mullen's NPI number?
- William Mullen's National Provider Identifier (NPI) is 1457362329, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Mullen's specialty?
- William Mullen is listed in the NPPES registry with a primary specialty of Cardiovascular Disease Physician (Allopathic & Osteopathic Physicians).
- Where is William Mullen located?
- William Mullen's practice location on file with NPPES is 2441 Mission College Blvd, Santa Clara, CA 95054-1214.
- What is William Mullen's phone number?
- The practice phone number listed in the NPPES registry for William Mullen is (800) 478-8837.
- Does William Mullen accept Medicare?
- William Mullen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Mullen's NPI active?
- Yes — William Mullen's NPI (1457362329) is active in the NPPES registry as of the last update on 2025-10-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.