NPPES file of Aug 9, 2026

Robert A. Collen, M.D.

Internal Medicine Physician · Cerritos, CA

Robert A. Collen, M.D. is an internal medicine physician with a practice address in Cerritos, California, and NPI 1538267125, issued on Sep 20, 2006. Check the license (California G21229, 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
1538267125
Name
Robert A. Collen
Credential
M.D.
Primary taxonomy
Internal Medicine Physician 207R00000X
License number
G21229 CA
Self-reported in NPPES; status is on the state search
Practice location
10802 College PL, Cerritos, CA 90703
Phone
(714) 397-0768
Enumerated
Sep 20, 2006
Record last updated
May 20, 2015 (not updated in 11 years: call before relying on the address or phone)
Medicaid ID
OOG212290 CA
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 10802 College PL

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

  1. James Earvin Basco, RNRegistered Nurse1750934600
  2. Kent CampbellRegistered Nurse1376188680
  3. Jasmine Charles, ASWSocial Worker1922668664
  4. Eden Ross DantesPsychiatric/Mental Health Registered Nurse1518518893
  5. Nicholas Fernando, RNRegistered Nurse1164075727
  6. John FloresLicensed Psychiatric Technician1871141515

Verify Robert A. Collen in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license G21229    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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100% fewer Medicare Part D claims than the average internal medicine physician in 2024

15 Medicare Part D claims, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.

  1. Robert Collen15
  2. Specialty average3,176

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.

23 internal medicine physician records list a practice address in Cerritos

They are 23 of the 1,842 NPPES records with a practice address in Cerritos, and 17,696 internal medicine physician records in California.

All 23 in Cerritos → All 17,696 in California → Every provider in Cerritos →

Other internal medicine physician records in California

  1. Jacob Aaron, MDSan Francisco, CA1407202518
  2. Alistair Aaronson, MDStanford, CA1457628760
  3. Jose Abad., MDSacramento, CA1144607219
  4. Donna Abare, MDOakland, CA1386722155
  5. Marce AbareScotts Valley, CA1457744708
  6. Samuel Abarte, M.D.Chula Vista, CA1578535498
  7. Alexander Abary, MDLong Beach, CA1104995919
  8. Luba Abascal, MDSan Francisco, CA1023180874
  9. Michael Abate, MDSacramento, CA1548248131
  10. Wali Abawi, D.O.Joshua Tree, CA1104362268

Common questions

What is Robert A. Collen, M.D.'s NPI number?

Robert A. Collen, M.D.'s National Provider Identifier (NPI) is 1538267125, issued on Sep 20, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Robert A. Collen, M.D. located?

The NPPES record lists a practice address at 10802 College PL, Cerritos, CA, 90703. Phone: (714) 397-0768. Providers update this record themselves, so call before visiting.

How can I verify Robert A. Collen, M.D.'s license?

NPPES lists California license number G21229, 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 A. Collen, M.D. prescribe under Medicare Part D?

In 2024, Robert A. Collen, M.D. had 15 Medicare Part D claims; 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.