William Nicholson, M.D.
NPI 1144381278 · Cardiovascular Disease Physician · Fremont, CA
Enrolled with Medicare as Practitioner - Cardiovascular Disease (cardiology) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Nicholson, M.D. is a Cardiovascular Disease Physician provider in Fremont, CA (NPI 1144381278).
Provider details
- NPI number
- 1144381278
- Entity type
- Individual
- Primary specialty
- Cardiovascular Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- G47903 (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 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
1,403 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) |
|---|---|---|
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report Only93010 | 780 | $9 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 497 | $153 |
| Ultrasound of Heart With Color-Depicted Blood Flow, Rate, Direction and Valve Function93306 | 67 | $76 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 37 | $88 |
| Telephone Medical Discussion With Physician, 21-30 Minutes99443 | 22 | $153 |
Typical Medicare-allowed amounts for these services range $9–$153 (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.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 51 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 232 | 62 |
| Carvedilol | 149 | 42 |
| Amlodipine Besylate | 134 | 38 |
| Lisinopril | 119 | 30 |
| Apixabanbrand: Eliquis | 105 | 23 |
| Metformin Hcl | 97 | 26 |
| Simvastatin | 96 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-12-13
- Last updated
- 2010-07-07
Frequently asked questions
- What is William Nicholson's NPI number?
- William Nicholson's National Provider Identifier (NPI) is 1144381278, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Nicholson's specialty?
- William Nicholson is listed in the NPPES registry with a primary specialty of Cardiovascular Disease Physician (Allopathic & Osteopathic Physicians).
- Where is William Nicholson located?
- William Nicholson's practice location on file with NPPES is 2557 Mowry Ave Ste 33, Fremont, CA 94538-1614.
- What is William Nicholson's phone number?
- The practice phone number listed in the NPPES registry for William Nicholson is (510) 745-8100.
- Does William Nicholson accept Medicare?
- William Nicholson is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Nicholson's NPI active?
- Yes — William Nicholson's NPI (1144381278) is active in the NPPES registry as of the last update on 2010-07-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.