NPPES file of Aug 9, 2026

Douglas George Clark, M.D.

Internal Medicine Physician · Garden Grove, CA

Douglas George Clark, M.D. is an internal medicine physician with a practice address in Garden Grove, California, and NPI 1780688572, issued on Jun 9, 2005. Check the license (California G050862, as entered in NPPES) on the Medical Board of California; 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
1780688572
Name
Douglas George Clark
Credential
M.D.
Primary taxonomy
Internal Medicine Physician 207R00000X
License number
G050862 CA
Self-reported in NPPES; status is on the state search
Practice location
12665 Garden Grove Blvd, Garden Grove, CA 92843
Phone
(714) 530-7373
Enumerated
Jun 9, 2005
Record last updated
Dec 27, 2007 (not updated in 19 years: call before relying on the address or phone)
Fax
(714) 530-7940
Medicare enrollment
Enrolled (PECOS I20090826000259); accepts Medicare assignment
Medical or professional school
Loma Linda University School Of Medicine, 1982
Telehealth
Offers telehealth (CMS)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →

Also registered at 12665 Garden Grove Blvd

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

  1. Mumtaz Ali, M.DSpecialist1700849049
  2. James Boyce, M.D.Ophthalmology Physician1457351652
  3. Allen Chou, MDGeriatric Medicine (Internal Medicine) Physician1215919915
  4. Naveen Dhar, M.D.Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician1871604116
  5. Usha Dhar, M.D.Family Medicine Physician1699886846
  6. Said El-Zayat, M.D.Family Medicine Physician1215042866

Verify Douglas George Clark in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license G050862    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 California license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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41% more Medicare Part D claims than the average internal medicine physician in 2024

4,465 Medicare Part D claims for 357 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims. 180 claims were for opioids.

  1. Douglas Clark4,465
  2. Specialty average3,176

Most prescribed

  1. Atorvastatin Calcium287 claims
  2. Amlodipine Besylate178 claims
  3. Levothyroxine Sodium164 claims
  4. Lisinopril119 claims
  5. Losartan Potassium117 claims
  6. Irbesartan116 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

  1. Providence Medical FoundationGarden Grove, CA

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Douglas George Clark among 17,696 internal medicine physician records in California

Douglas George Clark, M.D. is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.

  • NPI issued2005 · 0% of these records are older, 95% newer
  • In a Medicare fileYes · 79% of these records are
  • In the CMS Doctors and Clinicians fileYes · 63% of these records are
  • Graduated1982 · median 2004 among the 11,065 with a school on file
  • Record last updated2007 · 61% 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 California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

39 internal medicine physician records list a practice address in Garden Grove

They are 39 of the 4,572 NPPES records with a practice address in Garden Grove, and 17,696 internal medicine physician records in California.

All 17,696 in California → Every provider in Garden Grove → Internal Medicine Physician nationwide →

The 8 internal medicine physician records with the nearest ZIP codes

  1. Asaad Hakim, M.D.Garden Grove, CA 928431477504082
  2. Julie Hwynn, M.D.Garden Grove, CA 928431780682401
  3. Shireen Khalife, DOGarden Grove, CA 928431962922393
  4. Se-Young Lee, M.D.Garden Grove, CA 928431144336967
  5. Euil Lim, D.OGarden Grove, CA 928431770930828
  6. Philip Lynn, M.D.Garden Grove, CA 928431326044819
  7. Tuan Xuan Nguyen, MDGarden Grove, CA 928431679519821
  8. Hung Nguyen, M.D.Garden Grove, CA 928431538181763

Common questions

What is Douglas George Clark, M.D.'s NPI number?

Douglas George Clark, M.D.'s National Provider Identifier (NPI) is 1780688572, issued on Jun 9, 2005. An NPI identifies a provider in billing; it is not a license.

Where is Douglas George Clark, M.D. located?

The NPPES record lists a practice address at 12665 Garden Grove Blvd, Garden Grove, CA, 92843. Phone: (714) 530-7373. Providers update this record themselves, so call before visiting.

How can I verify Douglas George Clark, M.D.'s license?

NPPES lists California license number G050862, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

How much does Douglas George Clark, M.D. prescribe under Medicare Part D?

In 2024, Douglas George Clark, M.D. had 4,465 Medicare Part D claims for 357 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.

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.