NPPES file of Aug 9, 2026

Cynthia E. Dumler, M.D.

Family Medicine Physician · Lake Oswego, OR

Cynthia E. Dumler, M.D. is a family medicine physician with a practice address in Lake Oswego, Oregon, and NPI 1851342489, issued on May 16, 2006. Check the license (Oregon MD23827, as entered in NPPES) on the Oregon Medical Board; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1851342489
Name
Cynthia E. Dumler
Credential
M.D.
Primary taxonomy
Family Medicine Physician 207Q00000X
License number
MD23827 OR
Self-reported in NPPES; status is on the state search
Practice location
4309 Oakridge RD, Lake Oswego, OR 97035
Phone
(503) 636-9687
Enumerated
May 16, 2006
Record last updated
Feb 23, 2011 (not updated in 15 years: call before relying on the address or phone)
Fax
(503) 636-9680
Medicaid ID
08626-4 OR
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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Also registered at 4309 Oakridge RD

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Desiree Bryant, LMTMassage Therapist1982112058
  2. Summer HarnessNurse Practitioner1710629050
  3. H Harris, MDInternal Medicine Physician1962469551
  4. Ryan Milley, LAC, MACOMAcupuncturist1245369636
  5. Kris Pollack, DCChiropractor1417030628
  6. Trent Shoemaker, D.C.Chiropractor1184866204

Verify Cynthia E. Dumler in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersOregon Medical Board
    Search for license MD23827    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the Oregon license search

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90% fewer Medicare Part D claims than the average family medicine physician in 2024

371 Medicare Part D claims for 65 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims.

  1. Cynthia Dumler371
  2. Specialty average3,544

Most prescribed

  1. Quetiapine Fumarate41 claims
  2. Mirtazapine28 claims
  3. Memantine Hcl25 claims
  4. Timolol Maleate16 claims
  5. Levothyroxine Sodium15 claims
  6. Amlodipine Besylate13 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.

24 family medicine physician records list a practice address in Lake Oswego

They are 24 of the 1,377 NPPES records with a practice address in Lake Oswego, and 2,847 family medicine physician records in Oregon.

All 24 in Lake Oswego → All 2,847 in Oregon → Every provider in Lake Oswego →

Other family medicine physician records in Oregon

  1. Roxana Abbott, DOPortland, OR1275799082
  2. David Abdun-Nur, M.D.Grants Pass, OR1396737847
  3. Traci Ackron, D.O.Hillsboro, OR1336588789
  4. Orlando Acosta, MDHood River, OR1912990375
  5. Michele Adamcak, D.O.Tigard, OR1114097227
  6. Standley Adamek, DOTigard, OR1144515230
  7. Harry Adamo, MDSpringfield, OR1235191412
  8. Allyson AdamsClackamas, OR1043899537
  9. Caroline Adams, MDGresham, OR1164840815
  10. Justin Adams, M.D.Medford, OR1760616866

Common questions

What is Cynthia E. Dumler, M.D.'s NPI number?

Cynthia E. Dumler, M.D.'s National Provider Identifier (NPI) is 1851342489, issued on May 16, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Cynthia E. Dumler, M.D. located?

The NPPES record lists a practice address at 4309 Oakridge RD, Lake Oswego, OR, 97035. Phone: (503) 636-9687. Providers update this record themselves, so call before visiting.

How can I verify Cynthia E. Dumler, M.D.'s license?

NPPES lists Oregon license number MD23827, 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 Cynthia E. Dumler, M.D. prescribe under Medicare Part D?

In 2024, Cynthia E. Dumler, M.D. had 371 Medicare Part D claims for 65 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.