NPI registry status
Active
2026 NPPES data Emergency Medicine Physician NPI 1841579414 M.D.
Verify on CMS → Ricardo Mestres, M.D.
Emergency Medicine Physician in Los Angeles, 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 64,463 in Emergency 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
438
Medicare Part D claims · 238 beneficiaries · Emergency Medicine Physician avg: 352
What the federal data shows
Ricardo Mestres, M.D. filed 438 Medicare Part D claims in 2023 as an Emergency Medicine Physician in Los Angeles, California.
- 438
- Part D claims, 2023
- ≥62nd
- 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.
Ricardo Mestres, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
438 ≥ 62nd percentile 62% of 1,370,886 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 · 2023
◑
Board-eligible specialty (heuristic, not verified)
Ricardo Mestres, M.D. 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 Ricardo Mestres, M.D.?
Quality data not reportedPrimary specialty
Emergency Medicine Physician
Medicare Part D claims
438 24% vs specialty avg
Specialty distribution in California
How Emergency 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 Emergency 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).
Ricardo Mestres, M.D. appears in the CMS NPPES registry as an Emergency Medicine Physician provider holding M.D. credentials at 1200 N STATE ST RM 1018, Los Angeles, CA, 90033, with a listed phone of (323) 226-6937. NPI 1841579414 was issued on 08/12/2011.
Medicare Part D records for calendar year 2023 show 438 prescription claims written by this provider, covering 238 Medicare beneficiaries and totaling roughly $12K in drug spend, with an opioid prescribing rate of 24.4%.
Emergency Medicine Physician is a high-volume specialty nationwide, with 64,463 enrolled providers across 56 states and an average of 352 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
Provider Details
| NPI | 1841579414 |
|---|---|
| Specialty | Emergency Medicine Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 08/12/2011 |
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 Ricardo Mestres, M.D.. To verify Ricardo Mestres, 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.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
438
Total Claims
$12K
Total Drug Cost
238
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 451
- Total Day Supply
- 5,733
- Generic Drug Cost
- $5K
- Opioid Claims
- 107 (24.4% rate)
- Antibiotic Claims
- 101
Patient Demographics
- Average Patient Age
- 75.4 years
- Avg HCC Risk Score
- 1.47
- Gender Split
- 57% female / 43% male
- Age Distribution
- <65: 15, 65-74: 97, 75-84: 85, 85+: 41
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Ricardo Mestres, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Hydrocodone-Acetam…
Hydrocodone-Acetaminophen
72 claims
- Ondansetron Hcl
Ondansetron Hcl
63 claims
- Oxycodone-Acetamin…
Oxycodone-Acetaminophen
34 claims
- Cephalexin
Cephalexin
29 claims
- Amoxicillin-Clavul… 16
Amoxicillin-Clavulanate Potass
16 claims
- Pantoprazole Sodium 15
Pantoprazole Sodium
15 claims
- Pradaxa 12
Pradaxa
12 claims
- Cefpodoxime Proxetil 11
Cefpodoxime Proxetil
11 claims
| Drug | Claims |
|---|---|
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 72 |
| Ondansetron Hcl | 63 |
| Oxycodone-Acetaminophen Oxycodone Hcl/Acetaminophen | 34 |
| Cephalexin | 29 |
| Amoxicillin-Clavulanate Potass Amoxicillin/Potassium Clav | 16 |
| Pantoprazole Sodium | 15 |
| Pradaxa Dabigatran Etexilate Mesylate | 12 |
| Cefpodoxime Proxetil | 11 |
| Ibuprofen | 11 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Emergency Medicine Physician Overview
How Ricardo Mestres, M.D. fits within the Emergency Medicine Physician landscape nationally.
64,463
Emergency Medicine Physician Providers in US
56
States with Emergency Medicine Physician
352
Avg Claims per Provider
Ricardo Mestres, M.D.'s 438 claims are above the specialty average of 352.
Nearby Emergency Medicine Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Mestres.
Dr. Cooper Aakhus
MD
Stanford, CA
Dr. Pyra Aarden
MD
Martinez, CA
Dr. Neal Aaron
D.O.
Encinitas, CA
Eric Aaserude
Walnut Creek, CA
Dr. Nader Abas
MD
Barstow, CA
Compare Emergency 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 Emergency 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 Ricardo Mestres, M.D.'s specialty? ▼
Ricardo Mestres, M.D. specializes in Emergency Medicine Physician and practices in Los Angeles, California. Credentials: M.D..
How much does Ricardo Mestres, M.D. prescribe under Medicare Part D? ▼
In 2023, Ricardo Mestres, M.D. wrote 438 Medicare Part D claims totaling $12K in drug costs for 238 beneficiaries.
Where is Ricardo Mestres, M.D. located? ▼
Ricardo Mestres, M.D. is located at 1200 N STATE ST RM 1018, Los Angeles, CA, 90033. Phone: (323) 226-6937.
What is Ricardo Mestres, M.D.'s NPI number? ▼
Ricardo Mestres, M.D.'s National Provider Identifier (NPI) is 1841579414, issued on 08/12/2011.
Does Ricardo Mestres, M.D. prescribe opioids? ▼
Yes, Ricardo Mestres, M.D. had 107 opioid claims in 2023 with an opioid prescribing rate of 24.4%.
How many Emergency Medicine Physician providers are there in the US? ▼
There are 64,463 Emergency Medicine Physician providers across 56 states in the US. The average Emergency Medicine Physician provider writes 352 Medicare Part D claims per year.
What drugs does Ricardo Mestres, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Ricardo Mestres, M.D.'s most frequently prescribed drugs include Hydrocodone-Acetaminophen, Ondansetron Hcl, Oxycodone-Acetaminophen. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Ricardo Mestres, M.D. accept Medicare? ▼
Ricardo Mestres, M.D. appears in CMS Medicare data with 438 Part D claims and 238 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Ricardo Mestres, M.D.'s credentials? ▼
Ricardo Mestres, M.D.'s NPI is 1841579414 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.
- 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
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.