NPI registry status
Active
2026 NPPES data Research Study Specialist NPI 1851617658 MD
Verify on CMS → Guillermo Cazares, MD
Research Study Specialist in Odessa, Texas.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 485 in Research Study Specialist, 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
375
Medicare Part D claims · 224 beneficiaries · Research Study Specialist avg: 601
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Guillermo Cazares, MD filed 375 Medicare Part D claims in 2023 as a Research Study Specialist in Odessa, Texas.
- 375
- Part D claims, 2023
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.
Guillermo Cazares, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
375 Top 43% higher than 57% of 1,370,886 prescribers
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.
Source CMS Medicare Part D Prescriber Public Use File · 2023
What does the federal data show about Guillermo Cazares, MD?
Quality data not reportedPrimary specialty
Research Study Specialist
Medicare Part D claims
375 38% vs specialty avg
Specialty distribution in Texas
How Research Study Specialist compares to other specialties among Texas 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 Research Study Specialist. 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).
Guillermo Cazares, MD appears in the CMS NPPES registry as a Research Study Specialist provider holding MD credentials at 701 W 5TH ST, Odessa, TX, 79763, with a listed phone of (432) 703-5238. NPI 1851617658 was issued on 04/19/2010.
Medicare Part D records for calendar year 2023 show 375 prescription claims written by this provider, covering 224 Medicare beneficiaries and totaling roughly $6K in drug spend, with an opioid prescribing rate of 8.3%.
Research Study Specialist is a narrow specialty nationwide, with 485 enrolled providers across 42 states and an average of 601 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 | 1851617658 |
|---|---|
| Specialty | Research Study Specialist |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 04/19/2010 |
Hospital and facility affiliations
Facilities where Guillermo Cazares, MD 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.
Hospitalist Medicine Physicians OF Texas - Houston, PLLC
El Paso, TX
Sound Physicians Emergency Medicine OF Texas PLLC
Lubbock, TX
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 - Texas TMB 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 ~77K Texas medical licensees in 2023 - they are NOT specific to Guillermo Cazares, MD. To verify Guillermo Cazares, MD's current license status, search the TMB public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
344
Total board actions, Texas 2023
Across 334 cases
4.47
Actions per 1,000 licensees
Texas statewide rate
probation
Most common action type
94 cases
TMB 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 Texas 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.
375
Total Claims
$6K
Total Drug Cost
224
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 379
- Total Day Supply
- 3,588
- Generic Drug Cost
- $4K
- Opioid Claims
- 31 (8.3% rate)
- Antibiotic Claims
- 101
Patient Demographics
- Average Patient Age
- 70.1 years
- Avg HCC Risk Score
- 1.56
- Gender Split
- 63% female / 38% male
- Age Distribution
- <65: 46, 65-74: 102, 75-84: 55, 85+: 21
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Guillermo Cazares, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Ondansetron Odt
Ondansetron Odt
37 claims
- Methocarbamol
Methocarbamol
29 claims
- Cephalexin
Cephalexin
26 claims
- Amoxicillin-Clavul…
Amoxicillin-Clavulanate Potass
19 claims
- Prednisone
Prednisone
19 claims
- Diclofenac Sodium
Diclofenac Sodium
18 claims
- Dicyclomine Hcl
Dicyclomine Hcl
16 claims
- Hydrocodone-Acetam…
Hydrocodone-Acetaminophen
16 claims
| Drug | Claims |
|---|---|
| Ondansetron Odt Ondansetron | 37 |
| Methocarbamol | 29 |
| Cephalexin | 26 |
| Amoxicillin-Clavulanate Potass Amoxicillin/Potassium Clav | 19 |
| Prednisone | 19 |
| Diclofenac Sodium | 18 |
| Dicyclomine Hcl | 16 |
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 16 |
| Sulfamethoxazole-Trimethoprim Sulfamethoxazole/Trimethoprim | 14 |
| Acetaminophen-Codeine Acetaminophen With Codeine | 13 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Research Study Specialist Overview
How Guillermo Cazares, MD fits within the Research Study Specialist landscape nationally.
485
Research Study Specialist Providers in US
42
States with Research Study Specialist
601
Avg Claims per Provider
Guillermo Cazares, MD's 375 claims are below the specialty average of 601.
Nearby Research Study Specialist Providers in Texas
Other clinicians with the same primary specialty enrolled in Texas, drawn from the same CMS NPPES roster as Cazares.
Gozde Baskoy
San Antonio, TX
Dr. Aaron Becker
PHD
Houston, TX
Dr. Artur Bodnar
MD
Dallas, TX
Lucas Brilliott
Fort Hood, TX
Dr. Stephen Bunt
L/ATC EDD
Irving, TX
Compare Research Study Specialist 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 Texas medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Research Study Specialist 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 Guillermo Cazares, MD's specialty? ▼
Guillermo Cazares, MD specializes in Research Study Specialist and practices in Odessa, Texas. Credentials: MD.
How much does Guillermo Cazares, MD prescribe under Medicare Part D? ▼
In 2023, Guillermo Cazares, MD wrote 375 Medicare Part D claims totaling $6K in drug costs for 224 beneficiaries.
Where is Guillermo Cazares, MD located? ▼
Guillermo Cazares, MD is located at 701 W 5TH ST, Odessa, TX, 79763. Phone: (432) 703-5238.
What is Guillermo Cazares, MD's NPI number? ▼
Guillermo Cazares, MD's National Provider Identifier (NPI) is 1851617658, issued on 04/19/2010.
Does Guillermo Cazares, MD prescribe opioids? ▼
Yes, Guillermo Cazares, MD had 31 opioid claims in 2023 with an opioid prescribing rate of 8.3%.
How many Research Study Specialist providers are there in the US? ▼
There are 485 Research Study Specialist providers across 42 states in the US. The average Research Study Specialist provider writes 601 Medicare Part D claims per year.
What drugs does Guillermo Cazares, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Guillermo Cazares, MD's most frequently prescribed drugs include Ondansetron Odt, Methocarbamol, Cephalexin. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Guillermo Cazares, MD accept Medicare? ▼
Guillermo Cazares, MD appears in CMS Medicare data with 375 Part D claims and 224 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Guillermo Cazares, MD's credentials? ▼
Guillermo Cazares, MD's NPI is 1851617658 with credentials MD. 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
Compiled from official public sources by the PlainDoctor editorial team.
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.