Ruth Chambi - Hernandez, M.D.
Family Medicine Physician · Ontario, CA
Ruth Chambi - Hernandez, M.D. is a family medicine physician with a practice address in Ontario, California, and NPI 1144260118, issued on Jun 7, 2006. Check the license (California A87453, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ruth Chambi - Hernandez
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- A87453 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1871 E 4TH St, Ontario, CA 91764
- Phone
- (909) 297-3337
- Enumerated
- Jun 7, 2006
- Record last updated
- Sep 26, 2023
- Fax
- (909) 532-8171
- Medicaid ID
- 00A874530 CA
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Verify Ruth Chambi - Hernandez in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A87453Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
11% fewer Medicare Part D claims than the average family medicine physician in 2024
3,161 Medicare Part D claims for 476 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims.
Most prescribed
- Atorvastatin Calcium343 claims
- Metformin Hcl260 claims
- Hydrochlorothiazide164 claims
- Losartan Potassium164 claims
- Levothyroxine Sodium132 claims
- Lisinopril119 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.
Ruth Chambi - Hernandez among 17,133 family medicine physician records in California
Ruth Chambi - Hernandez, M.D. is one of 17,133 family medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 6% of them.
- NPI issued2006 · 6% of these records are older, 59% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileNo · 62% of these records are
- Record last updated2023 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Family Medicine Physician providers in California
There are 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Ontario → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Renu Bhupathy, M.D.Ontario, CA 917641265815302
- Jamal Abdel-Rahman, M.D.Montclair, CA 917631780628842
- Dalia Corleone, MDMontclair, CA 917631649443599
- Justin Delatore, D.OMontclair, CA 917631376950857
- William FenertyDiamond Bar, CA 917651184625915
- John Fonmin, MDDiamond Bar, CA 917651629147319
- Evan Geise, D.O.Montclair, CA 917631215345194
- Andres Gonzalez, M.D.Montclair, CA 917631669892147
Common questions
What is Ruth Chambi - Hernandez, M.D.'s NPI number?
Ruth Chambi - Hernandez, M.D.'s National Provider Identifier (NPI) is 1144260118, issued on Jun 7, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Ruth Chambi - Hernandez, M.D. located?
The NPPES record lists a practice address at 1871 E 4TH St, Ontario, CA, 91764. Phone: (909) 297-3337. Providers update this record themselves, so call before visiting.
How can I verify Ruth Chambi - Hernandez, M.D.'s license?
NPPES lists California license number A87453, 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 Ruth Chambi - Hernandez, M.D. prescribe under Medicare Part D?
In 2024, Ruth Chambi - Hernandez, M.D. had 3,161 Medicare Part D claims for 476 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.