William Maes, MD
NPI 1114488525 · Family Medicine Physician · Seattle, WA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Maes, MD is a Family Medicine Physician provider in Seattle, WA (NPI 1114488525).
Provider details
- NPI number
- 1114488525
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
7 yrs in NPPES registry
- Profile completeness38% of score
83% of core fields populated
- Practice footprint23% of score
2 documented practice locations
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 prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 17 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 81 | 42 |
| Losartan Potassium | 42 | 20 |
| Lisinopril | 38 | 17 |
| Amlodipine Besylate | 35 | 17 |
| Gabapentin | 32 | 15 |
| Tamsulosin Hcl | 25 | — |
| Omeprazole |
Practice location
Mailing address
Additional practice locations (1)
- 975 Sereno DrFamily Medicine DepartmentVallejo, CA 94589-2441Phone: (707) 651-4071
Registry dates
- Enumerated
- 2019-03-28
- Last updated
- 2026-03-17
- Certified
- 2026-03-17
Frequently asked questions
- What is William Maes's NPI number?
- William Maes's National Provider Identifier (NPI) is 1114488525, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Maes's specialty?
- William Maes is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William Maes located?
- William Maes's practice location on file with NPPES is 9245 Rainier Ave S, Seattle, WA 98118-5569.
- What is William Maes's phone number?
- The practice phone number listed in the NPPES registry for William Maes is (206) 722-8444.
- Does William Maes accept Medicare?
- William Maes is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Maes's NPI active?
- Yes — William Maes's NPI (1114488525) is active in the NPPES registry as of the last update on 2026-03-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.