NPPES file of Aug 9, 2026

Gilbert Owen Andersen, M.D.

Internal Medicine Physician · Lompoc, CA

Gilbert Owen Andersen, M.D. is an internal medicine physician with a practice address in Lompoc, California, and NPI 1821091836, issued on May 23, 2005. Check the license (California A29916, 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
1821091836
Name
Gilbert Owen Andersen
Credential
M.D.
Primary taxonomy
Internal Medicine Physician 207R00000X
License number
A29916 CA
Self-reported in NPPES; status is on the state search
Practice location
136 N 3RD St, Lompoc, CA 93436
Phone
(805) 736-1253
Enumerated
May 23, 2005
Record last updated
Nov 29, 2016 (not updated in 10 years: call before relying on the address or phone)
Fax
(805) 736-5355
Medicare enrollment
Enrolled (PECOS I20040527001372); accepts Medicare assignment
Medical or professional school
University Of California, Irvine, California College Of Medicine, 1974
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 136 N 3RD St

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

  1. Rollin Bailey, M.D.Internal Medicine Physician1689662447
  2. Ann Bockius, M.F.T.Marriage & Family Therapist1629086756
  3. Laurie Colson-Young, M.A.Marriage & Family Therapist1083752679
  4. David Crouch, M.F.T.Marriage & Family Therapist1730197864
  5. Peter Davis, MDSurgery Physician1851404743
  6. Michael Dixon, LCSWClinical Social Worker1154768695

Verify Gilbert Owen Andersen in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license A29916    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

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54% fewer Medicare Part D claims than the average internal medicine physician in 2024

1,476 Medicare Part D claims for 58 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 16% of claims. 19 claims were for opioids.

  1. Gilbert Andersen1,476
  2. Specialty average3,176

Most prescribed

  1. Levothyroxine Sodium140 claims
  2. Amlodipine Besylate76 claims
  3. Lisinopril75 claims
  4. Atorvastatin Calcium72 claims
  5. Simvastatin61 claims
  6. Furosemide60 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.

One hospital affiliation

  1. Lompoc Valley Medical CenterLompoc, CA · Acute Care Hospitals1 of 5 stars

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.

Gilbert Owen Andersen among 17,696 internal medicine physician records in California

Gilbert Owen Andersen, 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
  • Graduated1974 · median 2004 among the 11,065 with a school on file
  • Record last updated2016 · 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).

14 internal medicine physician records list a practice address in Lompoc

They are 14 of the 795 NPPES records with a practice address in Lompoc, and 17,696 internal medicine physician records in California.

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

The 8 internal medicine physician records with the nearest ZIP codes

  1. Noor Al-Saud, MDLompoc, CA 934361548882566
  2. Rollin Bailey, M.D.Lompoc, CA 934361689662447
  3. Babak Baradar-Bokaie, MDLompoc, CA 934361225083876
  4. Olesya Brissey, M.D.Lompoc, CA 934361891192969
  5. Edith Foley, MDLompoc, CA 934361770698698
  6. Howard Gregersen, M.D.Lompoc, CA 934361467474999
  7. Robert Guerra, M.D.Lompoc, CA 934361518988062
  8. Khawar Gul, MDLompoc, CA 934361538296744

Common questions

What is Gilbert Owen Andersen, M.D.'s NPI number?

Gilbert Owen Andersen, M.D.'s National Provider Identifier (NPI) is 1821091836, issued on May 23, 2005. An NPI identifies a provider in billing; it is not a license.

Where is Gilbert Owen Andersen, M.D. located?

The NPPES record lists a practice address at 136 N 3RD St, Lompoc, CA, 93436. Phone: (805) 736-1253. Providers update this record themselves, so call before visiting.

How can I verify Gilbert Owen Andersen, M.D.'s license?

NPPES lists California license number A29916, 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 Gilbert Owen Andersen, M.D. prescribe under Medicare Part D?

In 2024, Gilbert Owen Andersen, M.D. had 1,476 Medicare Part D claims for 58 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.