Gregory Lynn Clark, M.D.
Sleep Medicine (Psychiatry & Neurology) Physician · Portland, OR
Gregory Lynn Clark, M.D. is a sleep medicine (psychiatry & neurology) physician with a practice address in Portland, Oregon, and NPI 1225141823, issued on Aug 16, 2006. Check the license (Oregon MD18493, as entered in NPPES) on the Oregon Medical Board; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Gregory Lynn Clark
- Credential
- M.D.
- Primary taxonomy
- Sleep Medicine (Psychiatry & Neurology) Physician 2084S0012X
- License numbers
- MD18493 OR
OR MD18493 OR
WA MD00035294 WA
Self-reported in NPPES; status is on the state search - Practice location
- 11790 SW Barnes RD, Portland, OR 97225
- Phone
- (503) 228-4414
- Enumerated
- Aug 16, 2006
- Record last updated
- Mar 10, 2014 (not updated in 12 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
Also registered at 11790 SW Barnes RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Gregory Lynn Clark in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersOregon Medical Board
Search for license MD18493Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Sleep Medicine (Psychiatry & Neurology) Physician providers in Oregon
There are 13 sleep medicine (psychiatry & neurology) physician records in Oregon. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
Other sleep medicine (psychiatry & neurology) physician records in Oregon
- Theresa Buckley, M.D.Portland, OR1831283597
- Kaanchan Gangal, MDPortland, OR1306041777
- Chad Hagen, M.D.Portland, OR1962627265
- William Haynal, MDMedford, OR1114218120
- Hillary Lowenstein, M.D.Clackamas, OR1356548903
- Olukayode Ogunrinde, M.DSalem, OR1124213251
- Christine Quinto, M.D.La Grande, OR1174667406
- Sherrie Rawlins, M.D.Eugene, OR1487846556
- Gerald Rich, MDPortland, OR1548360829
- Thye Schuyler, MDSalem, OR1104025634
Common questions
What is Gregory Lynn Clark, M.D.'s NPI number?
Gregory Lynn Clark, M.D.'s National Provider Identifier (NPI) is 1225141823, issued on Aug 16, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gregory Lynn Clark, M.D. located?
The NPPES record lists a practice address at 11790 SW Barnes RD, Portland, OR, 97225. Phone: (503) 228-4414. Providers update this record themselves, so call before visiting.
How can I verify Gregory Lynn Clark, M.D.'s license?
NPPES lists Oregon license number MD18493, 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.
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.