Keith Alexander Luther, MD
Internal Medicine Physician · Mercer Island, WA
Keith Alexander Luther, MD is an internal medicine physician with a practice address in Mercer Island, Washington, and NPI 1912001652, issued on Sep 12, 2006. Check the license (Washington MD00037360, as entered in NPPES) on the Washington Medical Commission; the Medicare figures below come from public CMS files.
- Name
- Keith Alexander Luther
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- MD00037360 WA
Self-reported in NPPES; status is on the state search - Practice location
- 3236 78TH Ave SE Ste 200, Mercer Island, WA 98040
- Phone
- (206) 275-5060
- Enumerated
- Sep 12, 2006
- Record last updated
- Feb 16, 2026
- Fax
- (206) 275-5061
- Medicaid ID
- 1912001652 WA
- Medicare enrollment
- Enrolled (PECOS I20040217000500); accepts Medicare assignment
- Medical or professional school
- University Of Illinois College Of Med (Chi/Peor/Rock/Chm-Urb), 1993
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 3,079 in Washington → Look up another NPI →
Also registered at 3236 78TH Ave SE Ste 200
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Keith Alexander Luther in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWashington Medical Commission
Search for license MD00037360Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3% fewer Medicare Part D claims than the average internal medicine physician in 2024
3,088 Medicare Part D claims for 305 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 52 claims were for opioids.
Most prescribed
- Atorvastatin Calcium319 claims
- Levothyroxine Sodium146 claims
- Lisinopril137 claims
- Losartan Potassium131 claims
- Amlodipine Besylate95 claims
- Metformin Hcl Er78 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Swedish Health ServicesMercer Island, WA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Keith Alexander Luther among 3,079 internal medicine physician records in Washington
Keith Alexander Luther, MD 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. Its NPI, issued in 2006, is newer than 8% of them.
- NPI issued2006 · 8% of these records are older, 55% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated1993 · median 2006 among the 1,852 with a school on file
- Record last updated2026 · 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).
13 internal medicine physician records list a practice address in Mercer Island
They are 13 of the 331 NPPES records with a practice address in Mercer Island, and 3,079 internal medicine physician records in Washington.
All 3,079 in Washington → Every provider in Mercer Island → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Steven Dunning, MDMercer Island, WA 980401083941405
- Martin Gelfand, M.D.Mercer Island, WA 980401609299841
- Rutherford Hayes, MDMercer Island, WA 980401811072614
- Daniel Kent, M.D.Mercer Island, WA 980401184743809
- James Martin, MDMercer Island, WA 980401881681369
- Linda Rosenstock, MDMercer Island, WA 980401275803157
- Leonard Rosoff, M.D.Mercer Island, WA 980401730533001
- Alexandra Styhl, MDMercer Island, WA 980401689254500
Common questions
What is Keith Alexander Luther, MD's NPI number?
Keith Alexander Luther, MD's National Provider Identifier (NPI) is 1912001652, issued on Sep 12, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Keith Alexander Luther, MD located?
The NPPES record lists a practice address at 3236 78TH Ave SE Ste 200, Mercer Island, WA, 98040. Phone: (206) 275-5060. Providers update this record themselves, so call before visiting.
How can I verify Keith Alexander Luther, MD's license?
NPPES lists Washington license number MD00037360, 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.
How much does Keith Alexander Luther, MD prescribe under Medicare Part D?
In 2024, Keith Alexander Luther, MD had 3,088 Medicare Part D claims for 305 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. 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.