IndividualActive
William Ludwig, M.D.
NPI 1952390627 · Internal Medicine Physician · Seattle, WA
William Ludwig, M.D. is a Internal Medicine Physician provider in Seattle, WA (NPI 1952390627).
Provider details
- NPI number
- 1952390627
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- MD00014721 (WA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
Detailed profile(91/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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.
Practice location
1200 12th Ave S
Seattle, WA 98144-2712
Phone: (206) 326-2400
Street-level locationGet directions
Mailing address
1200 12th Ave S
Seattle, WA 98144-2712
Registry dates
- Enumerated
- 2005-10-17
- Last updated
- 2021-06-16
- Certified
- 2021-06-16
Frequently asked questions
- What is William Ludwig's NPI number?
- William Ludwig's National Provider Identifier (NPI) is 1952390627, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Ludwig's specialty?
- William Ludwig is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William Ludwig located?
- William Ludwig's practice location on file with NPPES is 1200 12th Ave S, Seattle, WA 98144-2712.
- What is William Ludwig's phone number?
- The practice phone number listed in the NPPES registry for William Ludwig is (206) 326-2400.
- Is William Ludwig's NPI active?
- Yes — William Ludwig's NPI (1952390627) is active in the NPPES registry as of the last update on 2021-06-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.