Robert Landman, M.D.
Internal Medicine Physician · Yorba Linda, CA
Robert Landman, M.D. is an internal medicine physician with a practice address in Yorba Linda, California, and NPI 1326035874, issued on Sep 30, 2005. Check the license (California G305501, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Robert Landman
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- G305501 CA
Self-reported in NPPES; status is on the state search - Practice location
- 4300 Rose Dr, Yorba Linda, CA 92886
- Phone
- (714) 528-4211
- Enumerated
- Sep 30, 2005
- Record last updated
- Apr 25, 2013 (not updated in 13 years: call before relying on the address or phone)
- Fax
- (714) 579-6868
- Medicare enrollment
- Enrolled (PECOS I20050730000231); accepts Medicare assignment
- Medical or professional school
- Chicago College Of Medicine And Surgery, 1975
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 4300 Rose Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Anthony Bae, M.D.Internal Medicine Physician1194711945
- Marienelle Banez, M.D.Pediatrics Physician1689695082
- Abram Beshay, MDDermatology Physician1356874218
- Paul Bracho, LCSW MFTClinical Social Worker1326185018
- Ai-Vy Bui, DOPediatrics Physician1821557984
Verify Robert Landman in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G305501Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
75% more Medicare Part D claims than the average internal medicine physician in 2024
5,559 Medicare Part D claims for 499 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 7% of claims. 108 claims were for opioids.
Most prescribed
- Atorvastatin Calcium382 claims
- Levothyroxine Sodium224 claims
- Amlodipine Besylate221 claims
- Losartan Potassium177 claims
- Lisinopril173 claims
- Omeprazole163 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
- Providence Medical FoundationFullerton, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Robert Landman among 17,696 internal medicine physician records in California
Robert Landman, 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
- Graduated1975 · median 2004 among the 11,065 with a school on file
- Record last updated2013 · 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).
17 internal medicine physician records list a practice address in Yorba Linda
They are 17 of the 748 NPPES records with a practice address in Yorba Linda, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Yorba Linda → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Anthony Bae, M.D.Yorba Linda, CA 928861194711945
- Carl Buckhorn, M.D.Yorba Linda, CA 928861649264847
- Edward Campagna, M.D.Yorba Linda, CA 928861598991895
- Allison Foley, MDYorba Linda, CA 928861982604906
- Maximilian Garces, M.D.Yorba Linda, CA 928861588650436
- Michael Lee, MDYorba Linda, CA 928861982334819
- Steve Lin, DOYorba Linda, CA 928861568783736
- Charlene Lin, MDYorba Linda, CA 928861447888375
Common questions
What is Robert Landman, M.D.'s NPI number?
Robert Landman, M.D.'s National Provider Identifier (NPI) is 1326035874, issued on Sep 30, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Robert Landman, M.D. located?
The NPPES record lists a practice address at 4300 Rose Dr, Yorba Linda, CA, 92886. Phone: (714) 528-4211. Providers update this record themselves, so call before visiting.
How can I verify Robert Landman, M.D.'s license?
NPPES lists California license number G305501, 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 Robert Landman, M.D. prescribe under Medicare Part D?
In 2024, Robert Landman, M.D. had 5,559 Medicare Part D claims for 499 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.
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.