William Maclellan, MD
NPI 1427077320 · Cardiovascular Disease Physician · Seattle, WA
Enrolled with Medicare as Practitioner - Cardiovascular Disease (cardiology) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Maclellan, MD is a Cardiovascular Disease Physician provider in Seattle, WA (NPI 1427077320).
Provider details
- NPI number
- 1427077320
- Entity type
- Individual
- Primary specialty
- Cardiovascular Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- G84856 (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
1,279 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 | 937 | $9 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report Only93010 | 135 | $9 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 55 | $106 |
| Exercise Or Drug-Induced Heart Stress Test With Electrocardiogram (ecg) With Review By Physician93018 | 31 | $15 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 25 | $130 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 12 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 47 | 15 |
| Metoprolol Succinate | 41 | 15 |
| Empagliflozinbrand: Jardiance | 36 | 11 |
| Sacubitril/Valsartanbrand: Entresto | 33 | — |
| Rosuvastatin Calcium | 30 | — |
| Carvedilol | 26 | — |
| Apixaban |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-19
- Last updated
- 2013-04-22
Frequently asked questions
- What is William Maclellan's NPI number?
- William Maclellan's National Provider Identifier (NPI) is 1427077320, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Maclellan's specialty?
- William Maclellan is listed in the NPPES registry with a primary specialty of Cardiovascular Disease Physician (Allopathic & Osteopathic Physicians).
- Where is William Maclellan located?
- William Maclellan's practice location on file with NPPES is 1959 Ne Pacific St, Seattle, WA 98195-6422.
- What is William Maclellan's phone number?
- The practice phone number listed in the NPPES registry for William Maclellan is (206) 616-1040.
- Does William Maclellan accept Medicare?
- William Maclellan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Maclellan's NPI active?
- Yes — William Maclellan's NPI (1427077320) is active in the NPPES registry as of the last update on 2013-04-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.