William R. Ludwig, M.D.
Internal Medicine Physician · Seattle, WA
William R. Ludwig, M.D. is an internal medicine physician with a practice address in Seattle, Washington, and NPI 1952390627, issued on Oct 17, 2005. Check the license (Washington MD00014721, as entered in NPPES) on the Washington Medical Commission; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- William R. Ludwig
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- MD00014721 WA
Self-reported in NPPES; status is on the state search - Practice location
- 1200 12TH Ave S, Seattle, WA 98144
- Phone
- (206) 326-2400
- Enumerated
- Oct 17, 2005
- Record last updated
- Jun 16, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicaid ID
- 1838903 WA
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 3,079 in Washington → Look up another NPI →
Also registered at 1200 12TH Ave S
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Marty Babcock, ARNPPrimary Care Nurse Practitioner1003804055
Verify William R. Ludwig in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWashington Medical Commission
Search for license MD00014721Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
William R. Ludwig among 3,079 internal medicine physician records in Washington
William R. Ludwig, M.D. is one of 3,079 internal medicine physician records with a practice address in Washington. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 92% newer
- In a Medicare fileNo · 75% of these records are
- In the CMS Doctors and Clinicians fileNo · 60% of these records are
- Record last updated2021 · 63% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Washington practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
821 internal medicine physician records list a practice address in Seattle
They are 821 of the 41,956 NPPES records with a practice address in Seattle, and 3,079 internal medicine physician records in Washington. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 3,079 in Washington → Every provider in Seattle → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Victoria Allen, MDSeattle, WA 981441154319796
- Stefano Bertozzi, MDSeattle, WA 981441457638835
- Sayuli Bhide, MDSeattle, WA 981441336726918
- Mitchell Karton, MDSeattle, WA 981441679668594
- Lesley King, MDSeattle, WA 981441346634557
- Serena Lam, M.D.Seattle, WA 981441447526488
- Amanda Methvin, MDSeattle, WA 981441194983551
- Nona Niculescu, M.D.Seattle, WA 981441003184946
Common questions
What is William R. Ludwig, M.D.'s NPI number?
William R. Ludwig, M.D.'s National Provider Identifier (NPI) is 1952390627, issued on Oct 17, 2005. An NPI identifies a provider in billing; it is not a license.
Where is William R. Ludwig, M.D. located?
The NPPES record lists a practice address at 1200 12TH Ave S, Seattle, WA, 98144. Phone: (206) 326-2400. Providers update this record themselves, so call before visiting.
How can I verify William R. Ludwig, M.D.'s license?
NPPES lists Washington license number MD00014721, as entered by the provider. Search the Washington Medical Commission at https://wahelms.my.site.com/s/license-search. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.