NPI registry status
Active
2026 NPPES data Geriatric Medicine (Family Medicine) Physician NPI 1083766463 DO
Verify on CMS → Ruby Singh, DO
Geriatric Medicine (Family Medicine) Physician in Fontana, California.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 1,792 in Geriatric Medicine (Family Medicine) Physician, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
2K
Medicare Part D claims · 94 beneficiaries · Geriatric Medicine (Family Medicine) Physician avg: 5K
What the federal data shows
Ruby Singh, DO filed 1,516 Medicare Part D claims in 2024 as a Geriatric Medicine (Family Medicine) Physician in Fontana, California.
- 2K
- Part D claims, 2024
- ≥81st
- pct by Part D claim volume (lower-bound band)
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
Federal trust snapshot
What official records show about Ruby Singh, DO
Federal records show an active NPI with Medicare Part D prescribing activity — verifiable registry data, not a proprietary rating.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1083766463), first enumerated 01/17/2007.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 1,516 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
Board certification signal
Practices in an ABMS-board-eligible specialty; board certification not confirmed in federal records.
- State context
State board disciplinary context
California statewide board action statistics are published annually — these figures describe aggregate state activity, not Ruby Singh, DO's individual license status. Verify directly with the state medical board.
Source: MBC annual report 2023
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1083766463 · Geriatric Medicine (Family Medicine) Physician
NPI-10 · ENUM-MID · TAX-NARROW · RX-MID · BOOK-THIN · PHOTO-ENUM
- NPI-10 1083766463
- ENUM-MID 2007
- TAX-NARROW 1,792
- RX-MID 1,516
- BOOK-THIN 250 in California
- PHOTO-ENUM Bhagyalaxmi Rudravaram · 2007
Ruby Singh, DO's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
1,516 ≥ 81st percentile 81% of 1,416,883 prescribers are in lower value bands
Each bar is a band; taller bars hold more prescribers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2024
◑
Board-eligible specialty (heuristic, not verified)
Ruby Singh, DO practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Ruby Singh, DO?
Quality data not reportedPrimary specialty
Geriatric Medicine (Family Medicine) Physician
Medicare Part D claims
1,516 69% vs specialty avg
Specialty distribution in California
How Geriatric Medicine (Family Medicine) Physician compares to other specialties among California providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Geriatric Medicine (Family Medicine) Physician. Verify directly:
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Practice Address
Provider Details
| NPI | 1083766463 |
|---|---|
| Specialty | Geriatric Medicine (Family Medicine) Physician |
| Credentials | DO |
| Gender | Female |
| NPI Issued | 01/17/2007 |
License & disciplinary context - California MBC 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~150K California medical licensees in 2023 - they are NOT specific to Ruby Singh, DO. To verify Ruby Singh, DO's current license status, search the MBC public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
576
Total board actions, California 2023
Across 556 cases
3.84
Actions per 1,000 licensees
California statewide rate
probation
Most common action type
186 cases
MBC publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the California disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2024.
1,516
Total Claims
$88K
Total Drug Cost
94
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,638.267
- Total Day Supply
- 33,131
- Generic Drug Cost
- $52K
- Opioid Claims
- 31 (2.0% rate)
- Antibiotic Claims
- 27
Patient Demographics
- Average Patient Age
- 80.3 years
- Avg HCC Risk Score
- 2.60
- Gender Split
- 55% female / 45% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Ruby Singh, DO prescribes most
Top Medicare Part D drugs by claim count, 2024
- Warfarin Sodium
Warfarin Sodium
200 claims
- Levothyroxine Sodium
Levothyroxine Sodium
82 claims
- Eliquis 55
Eliquis
55 claims
- Amlodipine Besylate 54
Amlodipine Besylate
54 claims
- Atorvastatin Calcium 49
Atorvastatin Calcium
49 claims
- Pradaxa 45
Pradaxa
45 claims
- Gabapentin 44
Gabapentin
44 claims
- Metoprolol Tartrate 38
Metoprolol Tartrate
38 claims
| Drug | Claims |
|---|---|
| Warfarin Sodium | 200 |
| Levothyroxine Sodium | 82 |
| Eliquis Apixaban | 55 |
| Amlodipine Besylate | 54 |
| Atorvastatin Calcium | 49 |
| Pradaxa Dabigatran Etexilate Mesylate | 45 |
| Gabapentin | 44 |
| Metoprolol Tartrate | 38 |
| Furosemide | 37 |
| Famotidine | 33 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Geriatric Medicine (Family Medicine) Physician in CA →
All providers in California →
Compare specialties →
Geriatric Medicine (Family Medicine) Physician Overview
How Ruby Singh, DO fits within the Geriatric Medicine (Family Medicine) Physician landscape nationally.
1,792
Geriatric Medicine (Family Medicine) Physician Providers in US
52
States with Geriatric Medicine (Family Medicine) Physician
4,917
Avg Claims per Provider
Ruby Singh, DO's 1,516 claims are below the specialty average of 4,917.
Nationwide Geriatric Medicine (Family Medicine) Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Singh, both outside California so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2007)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Geriatric Medicine (Family Medicine) Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Singh.
One of 250 Geriatric Medicine (Family Medicine) Physician providers enrolled in California, 5 are shown here.
Dr. Nagina Abdiani
DO
Orange, CA
Dr. Shivali Agarwal
M.D.
Fresno, CA
Dr. Kent Ahn
MD
Fontana, CA
Dr. Theresa Allison
M.D.
San Francisco, CA
Nancy Alvarez
NP
Simi Valley, CA
Compare Geriatric Medicine (Family Medicine) Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Ruby Singh, DO's specialty? ▼
Ruby Singh, DO specializes in Geriatric Medicine (Family Medicine) Physician and practices in Fontana, California. Credentials: DO.
How much does Ruby Singh, DO prescribe under Medicare Part D? ▼
In 2024, Ruby Singh, DO wrote 1,516 Medicare Part D claims totaling $88K in drug costs for 94 beneficiaries.
Where is Ruby Singh, DO located? ▼
Ruby Singh, DO is located at 9961 SIERRA AVE, Fontana, CA, 92335. Phone: (909) 427-3910.
What is Ruby Singh, DO's NPI number? ▼
Ruby Singh, DO's National Provider Identifier (NPI) is 1083766463, issued on 01/17/2007.
Does Ruby Singh, DO prescribe opioids? ▼
Yes, Ruby Singh, DO had 31 opioid claims in 2024 with an opioid prescribing rate of 2.0%.
How many Geriatric Medicine (Family Medicine) Physician providers are there in the US? ▼
There are 1,792 Geriatric Medicine (Family Medicine) Physician providers across 52 states in the US. The average Geriatric Medicine (Family Medicine) Physician provider writes 4,917 Medicare Part D claims per year.
What drugs does Ruby Singh, DO prescribe most often? ▼
Based on 2024 Medicare Part D data, Ruby Singh, DO's most frequently prescribed drugs include Warfarin Sodium, Levothyroxine Sodium, Eliquis. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Ruby Singh, DO accept Medicare? ▼
Ruby Singh, DO appears in CMS Medicare data with 1,516 Part D claims and 94 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Ruby Singh, DO's credentials? ▼
Ruby Singh, DO's NPI is 1083766463 with credentials DO. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2024). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of August 2026 (NPPES) / 2024 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of August 2026.