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2026 NPPES data Geriatric Medicine (Internal Medicine) Physician NPI 1275724361 M.D.
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Richard Nguyen, M.D.

Geriatric Medicine (Internal Medicine) Physician in San Diego, 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 4,171 in Geriatric Medicine (Internal 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
5K
Medicare Part D claims · 177 beneficiaries · Geriatric Medicine (Internal Medicine) Physician avg: 4K
Generic prescribing
83%
generic claims · 17% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
13/100
▼ 70 pts below national avg 83.5 · Penalty band
Verify NPI on CMS Methodology
Compiled from official public sources by the editorial process.

What the federal data shows

Richard Nguyen, M.D. reported a CMS MIPS final score of 13/100 - below the 83.5 national average - and filed 4,963 Medicare Part D claims in 2023.

13/100
MIPS score · -70 vs avg
5K
Part D claims, 2023
83%
generic prescribing
Likely
board-certified (heuristic)

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.

Richard Nguyen, M.D.'s MIPS score vs every measured U.S. clinician

CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure. Clinicians whose score CMS assigned without scoring any category are excluded.

13 ≥ 2nd percentile 2% of 454,083 measured providers are in lower value bands

0–10: 8,684 measured providers (2%). Below this entry. 10–20: 3,008 measured providers (1%). This entry sits in this band. 20–30: 3,069 measured providers (1%). Above this entry. 30–40: 2,746 measured providers (1%). Above this entry. 40–50: 2,928 measured providers (1%). Above this entry. 50–60: 5,882 measured providers (1%). Above this entry. 60–70: 13,906 measured providers (3%). Above this entry. 70–80: 94,570 measured providers (21%). Above this entry. 80–90: 129,887 measured providers (29%). Above this entry. 90+: 189,403 measured providers (42%). Above this entry. This provider 0 100 every measured MIPS clinician, bucketed by value

Each bar is a band; taller bars hold more measured providers. 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 whole-score-point band: it counts only measured clinicians in lower score bands. A CMS MIPS metric is not a recommendation or a clinical-quality rating by PlainDoctor. See methodology § corpus placement.

Source CMS Merit-based Incentive Payment System (MIPS) · 2023

Where Richard Nguyen, M.D. sits

This provider among geriatric medicine (internal medicine) physician peers

Across the 686 geriatric medicine (internal medicine) physician providers who report both Medicare Part D prescribing and a MIPS quality score, Richard Nguyen, M.D. writes more Part D claims than 68% of them and scores higher on MIPS quality than 2% - placing this provider in the high-volume, lower-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.

Part D claim volume vs MIPS quality, by specialty percentile

Lower volume · High qualityHigh volume · High qualityLower volume · Lower qualityHigh volume · Lower quality02550751000255075100Part D claim volume, percentile in specialtyMIPS quality, percentilePoint, Part D claim volume, percentile in specialty: 37 · MIPS quality, percentile: 82Point, Part D claim volume, percentile in specialty: 5 · MIPS quality, percentile: 90Point, Part D claim volume, percentile in specialty: 93 · MIPS quality, percentile: 98Point, Part D claim volume, percentile in specialty: 0 · MIPS quality, percentile: 32Point, Part D claim volume, percentile in specialty: 87 · MIPS quality, percentile: 3Point, Part D claim volume, percentile in specialty: 38 · MIPS quality, percentile: 52Point, Part D claim volume, percentile in specialty: 78 · MIPS quality, percentile: 35Point, Part D claim volume, percentile in specialty: 65 · MIPS quality, percentile: 38Point, Part D claim volume, percentile in specialty: 68 · MIPS quality, percentile: 37Point, Part D claim volume, percentile in specialty: 48 · MIPS quality, percentile: 58Point, Part D claim volume, percentile in specialty: 67 · MIPS quality, percentile: 5Point, Part D claim volume, percentile in specialty: 83 · MIPS quality, percentile: 10Point, Part D claim volume, percentile in specialty: 33 · MIPS quality, percentile: 15Point, Part D claim volume, percentile in specialty: 25 · MIPS quality, percentile: 75Point, Part D claim volume, percentile in specialty: 12 · MIPS quality, percentile: 20Point, Part D claim volume, percentile in specialty: 97 · MIPS quality, percentile: 2Point, Part D claim volume, percentile in specialty: 85 · MIPS quality, percentile: 28Point, Part D claim volume, percentile in specialty: 30 · MIPS quality, percentile: 50Point, Part D claim volume, percentile in specialty: 88 · MIPS quality, percentile: 7Point, Part D claim volume, percentile in specialty: 80 · MIPS quality, percentile: 13Point, Part D claim volume, percentile in specialty: 57 · MIPS quality, percentile: 27Point, Part D claim volume, percentile in specialty: 32 · MIPS quality, percentile: 82Point, Part D claim volume, percentile in specialty: 42 · MIPS quality, percentile: 12Point, Part D claim volume, percentile in specialty: 20 · MIPS quality, percentile: 70Point, Part D claim volume, percentile in specialty: 28 · MIPS quality, percentile: 47Point, Part D claim volume, percentile in specialty: 18 · MIPS quality, percentile: 92Point, Part D claim volume, percentile in specialty: 100 · MIPS quality, percentile: 30Point, Part D claim volume, percentile in specialty: 35 · MIPS quality, percentile: 62Point, Part D claim volume, percentile in specialty: 45 · MIPS quality, percentile: 55Point, Part D claim volume, percentile in specialty: 75 · MIPS quality, percentile: 65Point, Part D claim volume, percentile in specialty: 95 · MIPS quality, percentile: 88Point, Part D claim volume, percentile in specialty: 52 · MIPS quality, percentile: 85Point, Part D claim volume, percentile in specialty: 50 · MIPS quality, percentile: 22Point, Part D claim volume, percentile in specialty: 47 · MIPS quality, percentile: 72Point, Part D claim volume, percentile in specialty: 70 · MIPS quality, percentile: 68Point, Part D claim volume, percentile in specialty: 10 · MIPS quality, percentile: 78Point, Part D claim volume, percentile in specialty: 3 · MIPS quality, percentile: 40Point, Part D claim volume, percentile in specialty: 72 · MIPS quality, percentile: 60Point, Part D claim volume, percentile in specialty: 43 · MIPS quality, percentile: 33Point, Part D claim volume, percentile in specialty: 8 · MIPS quality, percentile: 48Point, Part D claim volume, percentile in specialty: 90 · MIPS quality, percentile: 17Point, Part D claim volume, percentile in specialty: 13 · MIPS quality, percentile: 98Point, Part D claim volume, percentile in specialty: 17 · MIPS quality, percentile: 42Point, Part D claim volume, percentile in specialty: 40 · MIPS quality, percentile: 87Point, Part D claim volume, percentile in specialty: 15 · MIPS quality, percentile: 43Point, Part D claim volume, percentile in specialty: 55 · MIPS quality, percentile: 57Point, Part D claim volume, percentile in specialty: 53 · MIPS quality, percentile: 67Point, Part D claim volume, percentile in specialty: 22 · MIPS quality, percentile: 63Point, Part D claim volume, percentile in specialty: 7 · MIPS quality, percentile: 25Point, Part D claim volume, percentile in specialty: 58 · MIPS quality, percentile: 72Point, Part D claim volume, percentile in specialty: 2 · MIPS quality, percentile: 18Point, Part D claim volume, percentile in specialty: 60 · MIPS quality, percentile: 80Point, Part D claim volume, percentile in specialty: 73 · MIPS quality, percentile: 53Point, Part D claim volume, percentile in specialty: 98 · MIPS quality, percentile: 8Point, Part D claim volume, percentile in specialty: 77 · MIPS quality, percentile: 95Point, Part D claim volume, percentile in specialty: 92 · MIPS quality, percentile: 93Point, Part D claim volume, percentile in specialty: 82 · MIPS quality, percentile: 97Point, Part D claim volume, percentile in specialty: 27 · MIPS quality, percentile: 45Point, Part D claim volume, percentile in specialty: 63 · MIPS quality, percentile: 23Point, Part D claim volume, percentile in specialty: 23 · MIPS quality, percentile: 77Richard Nguyen, M.D., Part D claim volume, percentile in specialty: 68 · MIPS quality, percentile: 2
Part D claim volume vs MIPS quality, by specialty percentile

Each dot is one geriatric medicine (internal medicine) physician peer from a representative sample of 60; the gold marker is Richard Nguyen, M.D.. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.

✓
Board certification likely (heuristic, not verified)

Richard Nguyen, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 3 hospital affiliations - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).

What does the federal data show about Richard Nguyen, M.D.?

Below national average

NPI registry status

Active

Issued 08/05/2007

NPI 1275724361

Primary specialty

Geriatric Medicine (Internal Medicine) Physician

Niche

4,171 US NPIs in this specialty

Medicare Part D claims

4,963 12% vs specialty avg

2023 prescription claims

Specialty avg: 4,450

MIPS final score

13/100 70.5 pts vs avg

Penalty band band

vs 83.5 national avg

Specialty distribution in California

How Geriatric Medicine (Internal Medicine) Physician compares to other specialties among California providers

California providers
Behavior Technician17.3%Marriage & Family Therapist5.5%Student in an Organized Heal…5%Mental Health Counselor3.9%Pharmacist3.5%Clinical Social Worker3.1%Geriatric Medicine (Internal…0.1%
Largest specialties in California (% of in-state providers)

Medicare quality performance, MIPS

Richard Nguyen, M.D.'s 2023 MIPS final score plotted against the Geriatric Medicine (Internal Medicine) Physician national average

Below national average
MIPS Final Score
13/100
vs 83.5 national avg · 2023 performance year

MIPS final score (Geriatric Medicine (Internal Medicine) Physician) - 13/100 vs national avg 83.5

0%100%National avg84%13%
MIPS final score (Geriatric Medicine (Internal Medicine) Physician) - 13/100 vs national avg 83.5
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).

Richard Nguyen, M.D. appears in the CMS NPPES registry as a Geriatric Medicine (Internal Medicine) Physician provider holding M.D. credentials at 2810 CAMINO DEL RIO S, San Diego, CA, 92108, with a listed phone of (619) 299-1419. NPI 1275724361 was issued on 08/05/2007.

Medicare Part D records for calendar year 2023 show 4,963 prescription claims written by this provider, covering 177 Medicare beneficiaries and totaling roughly $259K in drug spend, split 17% brand-name and 83% generic by claim count, with an opioid prescribing rate of 2.1%. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 13/100 for the 2023 performance year (Quality 0, Cost 43.5), compared with the 83.5 average among clinicians with a measured score.

Geriatric Medicine (Internal Medicine) Physician is a narrow specialty nationwide, with 4,171 enrolled providers across 52 states and an average of 4,450 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline.

Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist, always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.

Practice Address

2810 CAMINO DEL RIO S
San Diego, CA 92108
(619) 299-1419

Provider Details

NPI 1275724361
Specialty Geriatric Medicine (Internal Medicine) Physician
Credentials M.D.
Gender Male
NPI Issued 08/05/2007

CMS Quality Score (MIPS)

Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.

13.0353
Final Score
Measured-score avg: 83.5
0
Quality
43.4511
Cost
0
Promoting Interoperability

Reporting: Individual

Hospital and facility affiliations

Facilities where Richard Nguyen, M.D. bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.

According to CMS billing records, Richard Nguyen, M.D. is affiliated with 3 Medicare-billing facilities.

Del Sur Healthcare
El Cajon, CA
Rawi Medical, PC
San Diego, CA
Senior Medical Associates Inc
San Diego, CA

Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).

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 Richard Nguyen, M.D.. To verify Richard Nguyen, M.D.'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.

Brand vs generic prescribing mix · Typical

Richard Nguyen, M.D. - brand share 17.0%
Geriatric Medicine (Internal Medicine) Physician average

17% brand-name claims vs 83% generic, on 4,963 2023 Medicare Part D claims.

The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.

Medicare Part D Prescribing Data

CMS Medicare Part D prescriber-level data for calendar year 2023.

4,963
Total Claims
$259K
Total Drug Cost
177
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
5,018
Total Day Supply
90,858
Brand vs Generic
17% brand / 83% generic
Brand Drug Cost
$163K
Generic Drug Cost
$95K
Opioid Claims
102 (2.1% rate)
Antibiotic Claims
129

Patient Demographics

Average Patient Age
79.3 years
Avg HCC Risk Score
2.58
Gender Split
60% female / 40% male

Top Prescribed Drugs (Medicare Part D)

Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.

What Richard Nguyen, M.D. prescribes most

Top Medicare Part D drugs by claim count, 2023

claims
Source CMS Medicare Part D Prescriber Public Use File As of 2023
Drug Claims
Atorvastatin Calcium
 298
Eliquis
Apixaban
218
Levothyroxine Sodium
 176
Gabapentin
 161
Metoprolol Tartrate
 149
Amlodipine Besylate
 136
Metformin Hcl
 135
Tamsulosin Hcl
 129
Divalproex Sodium
 122
Lisinopril
 119

* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.

More Geriatric Medicine (Internal Medicine) Physician in CA → All providers in California → Compare specialties →

Geriatric Medicine (Internal Medicine) Physician Overview

How Richard Nguyen, M.D. fits within the Geriatric Medicine (Internal Medicine) Physician landscape nationally.

4,171
Geriatric Medicine (Internal Medicine) Physician Providers in US
52
States with Geriatric Medicine (Internal Medicine) Physician
4,450
Avg Claims per Provider

Richard Nguyen, M.D.'s 4,963 claims are above the specialty average of 4,450.

Nearby Geriatric Medicine (Internal Medicine) Physician Providers in California

Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Nguyen.

Dr. Adil Abbasi
M.D.
La Jolla, CA
Dr. Shashidar Acharya
M.D.
Orange, CA
Dr. Pouya Afshar
M.D.
San Diego, CA
Dr. Parag Agnihotri
M.D.
San Diego, CA
Dr. Andreas Ahlas
M.D.
Bakersfield, CA

Compare Geriatric Medicine (Internal Medicine) Physician nationally: see state-by-state distribution →

Before you book an appointment

Use this federal record as your verification checklist, not as a recommendation.

  • Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
  • Check the active license and any disciplinary history with the California medical board, federal registration is not a license check. Credential verification guide
  • Weigh a second option: compare this provider with a nearby Geriatric Medicine (Internal Medicine) Physician peer on Medicare volume and prescribing patterns. Compare providers

Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.

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Frequently Asked Questions

What is Richard Nguyen, M.D.'s specialty? ▼
Richard Nguyen, M.D. specializes in Geriatric Medicine (Internal Medicine) Physician and practices in San Diego, California. Credentials: M.D..
How much does Richard Nguyen, M.D. prescribe under Medicare Part D? ▼
In 2023, Richard Nguyen, M.D. wrote 4,963 Medicare Part D claims totaling $259K in drug costs for 177 beneficiaries.
What is Richard Nguyen, M.D.'s Medicare quality score? ▼
Richard Nguyen, M.D. has a CMS MIPS Final Score of 13/100 (Quality: 0, Cost: 43.5). The average MIPS Final Score across the 454,083 clinicians with at least one published category score is 83.5; clinicians whose score CMS assigned without scoring any category are excluded from that average. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Richard Nguyen, M.D. located? ▼
Richard Nguyen, M.D. is located at 2810 CAMINO DEL RIO S, San Diego, CA, 92108. Phone: (619) 299-1419.
What is Richard Nguyen, M.D.'s NPI number? ▼
Richard Nguyen, M.D.'s National Provider Identifier (NPI) is 1275724361, issued on 08/05/2007.
Does Richard Nguyen, M.D. prescribe more brand-name or generic drugs? ▼
Richard Nguyen, M.D.'s prescribing is 17% brand-name and 83% generic drugs by claim count, with $163K in brand drug costs.
Does Richard Nguyen, M.D. prescribe opioids? ▼
Yes, Richard Nguyen, M.D. had 102 opioid claims in 2023 with an opioid prescribing rate of 2.1%.
How many Geriatric Medicine (Internal Medicine) Physician providers are there in the US? ▼
There are 4,171 Geriatric Medicine (Internal Medicine) Physician providers across 52 states in the US. The average Geriatric Medicine (Internal Medicine) Physician provider writes 4,450 Medicare Part D claims per year.
What drugs does Richard Nguyen, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Richard Nguyen, M.D.'s most frequently prescribed drugs include Atorvastatin Calcium, Eliquis, Levothyroxine Sodium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Richard Nguyen, M.D. accept Medicare? ▼
Richard Nguyen, M.D. appears in CMS Medicare data with 4,963 Part D claims and 177 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Richard Nguyen, M.D.'s credentials? ▼
Richard Nguyen, M.D.'s NPI is 1275724361 with credentials M.D.. 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 (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
Quality Performance
CMS Merit-based Incentive Payment System (MIPS) - 2023 performance year.
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 April 2026 (NPPES) / 2023 (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

Compiled from official public sources by the editorial process.

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 May 2026.