Robert Mari Guerrero Ramos
Dentist · Walnut, CA
Robert Mari Guerrero Ramos is a dentist with a practice address in Walnut, California, and NPI 1336623255, issued on Sep 17, 2018. Check the license (California 49397, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Robert Mari Guerrero Ramos
- Primary taxonomy
- Dentist 122300000X
- License number
- 49397 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1249 N Grand Ave, Walnut, CA 91789
- Phone
- (909) 444-9488
- Enumerated
- Sep 17, 2018
- Record last updated
- Sep 17, 2018 (not updated in 8 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest dentist records → All 14,729 in California → Look up another NPI →
Verify Robert Mari Guerrero Ramos in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license 49397Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
83% fewer Medicare Part D claims than the average dentist in 2024
15 Medicare Part D claims, against an average of 86 among the 51,021 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of 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.
Robert Mari Guerrero Ramos among 14,729 dentist records in California
Robert Mari Guerrero Ramos is one of 14,729 dentist records with a practice address in California. 56% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2018, is newer than 76% of them.
- NPI issued2018 · 76% of these records are older, 22% newer
- In a Medicare fileYes · 56% of these records are
- In the CMS Doctors and Clinicians fileNo · under 1% of these records are
- Record last updated2018 · 73% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 122300000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
15 dentist records list a practice address in Walnut
They are 15 of the 317 NPPES records with a practice address in Walnut, and 14,729 dentist records in California.
All 14,729 in California → Every provider in Walnut → Dentist nationwide →
The 8 dentist records with the nearest ZIP codes
- Arshjot AhujaWalnut, CA 917891104088178
- Christopher Auyong, D.D.S.Walnut, CA 917891720488083
- Thomas Bae, D.D.S.Walnut, CA 917891467646547
- Kai Chang, D.D.S.Walnut, CA 917891427400688
- Oliver Chu, DMDWalnut, CA 917891962736975
- Laurentino De Guia, DMDWalnut, CA 917891952759888
- Emad Fahmy, DDSWalnut, CA 917891790926608
- Michael HannaWalnut, CA 917891649714247
Common questions
What is Robert Mari Guerrero Ramos's NPI number?
Robert Mari Guerrero Ramos's National Provider Identifier (NPI) is 1336623255, issued on Sep 17, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Robert Mari Guerrero Ramos located?
The NPPES record lists a practice address at 1249 N Grand Ave, Walnut, CA, 91789. Phone: (909) 444-9488. Providers update this record themselves, so call before visiting.
How can I verify Robert Mari Guerrero Ramos's license?
NPPES lists California license number 49397, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Robert Mari Guerrero Ramos prescribe under Medicare Part D?
In 2024, Robert Mari Guerrero Ramos had 15 Medicare Part D claims; the average among dentist prescribers was 86. 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.