Ruby Singh, DO
Geriatric Medicine (Family Medicine) Physician · Fontana, CA
Ruby Singh, DO is a geriatric medicine (family medicine) physician with a practice address in Fontana, California, and NPI 1083766463, issued on Jan 17, 2007. Check the license (California 20A9435, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ruby Singh
- Credential
- DO
- Primary taxonomy
- Geriatric Medicine (Family Medicine) Physician 207QG0300X
- License number
- 20A9435 CA
Self-reported in NPPES; status is on the state search - Practice location
- 9961 Sierra Ave, Fontana, CA 92335
- Phone
- (909) 427-3910
- Enumerated
- Jan 17, 2007
- Record last updated
- Nov 30, 2021 (not updated in 5 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest geriatric medicine (family medicine) physician records → All 243 in California → Look up another NPI →
Also registered at 9961 Sierra Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Marla Abrolat, MDPediatrics Physician1164593133
- Eduardo Acosta, MDPediatrics Physician1497803324
- Michael Adair, MDFamily Medicine Physician1780732651
- Berneva Adams, MDObstetrics & Gynecology Physician1376602987
Verify Ruby Singh in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A9435Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
71% fewer Medicare Part D claims than the average geriatric medicine (family medicine) physician in 2024
1,516 Medicare Part D claims for 94 beneficiaries, against an average of 5,222 among the 1,271 providers of this specialty who prescribed in Part D. 31 claims were for opioids.
Most prescribed
- Warfarin Sodium200 claims
- Levothyroxine Sodium82 claims
- Eliquis55 claims
- Amlodipine Besylate54 claims
- Atorvastatin Calcium49 claims
- Pradaxa45 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.
Ruby Singh among 243 geriatric medicine (family medicine) physician records in California
Ruby Singh, DO is one of 243 geriatric medicine (family medicine) physician records with a practice address in California. 76% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 47% of them.
- NPI issued2007 · 47% of these records are older, 35% newer
- In a Medicare fileYes · 76% of these records are
- In the CMS Doctors and Clinicians fileNo · 46% of these records are
- Record last updated2021 · 69% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207QG0300X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Geriatric Medicine (Family Medicine) Physician providers in California
There are 243 geriatric medicine (family medicine) physician records in California.
All 243 in California → Every provider in Fontana → Geriatric Medicine (Family Medicine) Physician nationwide →
The 8 geriatric medicine (family medicine) physician records with the nearest ZIP codes
- Kent Ahn, MDFontana, CA 923351083762017
- Israel Coutin, MDFontana, CA 923351790852663
- Juanito Garlitos, MDFontana, CA 923351780751644
- Karisa Jahn, D.O.Fontana, CA 923351346531027
- Kamal Kejriwal, MDFontana, CA 923351336210392
- Helen Lee, MDFontana, CA 923351336210244
- Norman Ragaza, MDFontana, CA 923351508925249
- Esther Won, MDFontana, CA 923351902973803
Common questions
What is Ruby Singh, DO's NPI number?
Ruby Singh, DO's National Provider Identifier (NPI) is 1083766463, issued on Jan 17, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Ruby Singh, DO located?
The NPPES record lists a practice address at 9961 Sierra Ave, Fontana, CA, 92335. Phone: (909) 427-3910. Providers update this record themselves, so call before visiting.
How can I verify Ruby Singh, DO's license?
NPPES lists California license number 20A9435, 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 Ruby Singh, DO prescribe under Medicare Part D?
In 2024, Ruby Singh, DO had 1,516 Medicare Part D claims for 94 beneficiaries; the average among geriatric medicine (family medicine) physician prescribers was 5,222. 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.