Merle Dean Williamson, M.D.
Addiction Medicine (Anesthesiology) Physician · Happy Valley, OR
Merle Dean Williamson, M.D. is an addiction medicine (anesthesiology) physician with a practice address in Happy Valley, Oregon, and NPI 1467465823, issued on Aug 15, 2006. Check the license (Oregon MD14580, as entered in NPPES) on the Oregon Medical Board; the Medicare figures below come from public CMS files.
- Name
- Merle Dean Williamson
- Credential
- M.D.
- Primary taxonomy
- Addiction Medicine (Anesthesiology) Physician 207LA0401X
- License number
- MD14580 OR
Self-reported in NPPES; status is on the state search - Practice location
- 11167 SE Valley View Ter, Happy Valley, OR 97086
- Phone
- (503) 880-4852
- Enumerated
- Aug 15, 2006
- Record last updated
- Jun 29, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (503) 698-5268
- Entity
- Type 1 · individual
5 nearest addiction medicine (anesthesiology) physician records → All 6 in Oregon → Look up another NPI →
Verify Merle Dean Williamson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersOregon Medical Board
Search for license MD14580Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
73% fewer Medicare Part D claims than the average addiction medicine (anesthesiology) physician in 2024
92 Medicare Part D claims for 20 beneficiaries, against an average of 345 among the 58 providers of this specialty who prescribed in Part D.
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.
Addiction Medicine (Anesthesiology) Physician providers in Oregon
There are 6 addiction medicine (anesthesiology) physician records in Oregon.
All 6 in Oregon → Every provider in Happy Valley → Addiction Medicine (Anesthesiology) Physician nationwide →
The 5 addiction medicine (anesthesiology) physician records with the nearest ZIP codes
- Phillip Torralva, M.D.Portland, OR 972141912051012
- Lorne Cross, MDSalem, OR 973011548370463
- James Laidler, M.D.Salem, OR 973011629322888
- Martin Klos, MDSpringfield, OR 974781861559627
- Douglas Diehl, M.D.Medford, OR 975041225128093
Common questions
What is Merle Dean Williamson, M.D.'s NPI number?
Merle Dean Williamson, M.D.'s National Provider Identifier (NPI) is 1467465823, issued on Aug 15, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Merle Dean Williamson, M.D. located?
The NPPES record lists a practice address at 11167 SE Valley View Ter, Happy Valley, OR, 97086. Phone: (503) 880-4852. Providers update this record themselves, so call before visiting.
How can I verify Merle Dean Williamson, M.D.'s license?
NPPES lists Oregon license number MD14580, as entered by the provider. Search the Oregon Medical Board at https://www.oregon.gov/OMB/Pages/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Merle Dean Williamson, M.D. prescribe under Medicare Part D?
In 2024, Merle Dean Williamson, M.D. had 92 Medicare Part D claims for 20 beneficiaries; the average among addiction medicine (anesthesiology) physician prescribers was 345. 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.