NPI registry status
Active
2026 NPPES data Otolaryngology Physician NPI 1588652168 MD
Verify on CMS → Gustavo Diaz-Reyes, MD
Otolaryngology Physician in Kyle, 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 10,895 in Otolaryngology 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
145
Medicare Part D claims · 63 beneficiaries · Otolaryngology Physician avg: 509
Generic prescribing
90%
generic claims · 10% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2023
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Gustavo Diaz-Reyes, MD filed 145 Medicare Part D claims in 2023 as a Otolaryngology Physician in Kyle, Texas, prescribing 90% generic.
- 145
- Part D claims, 2023
- 90%
- 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.
Gustavo Diaz-Reyes, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
145 35th percentile higher than 35% 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
✓
Board certification likely (heuristic, not verified)
Gustavo Diaz-Reyes, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 1 hospital affiliation - 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 Gustavo Diaz-Reyes, MD?
Quality data not reportedPrimary specialty
Otolaryngology Physician
Medicare Part D claims
145 72% vs specialty avg
Specialty distribution in Texas
How Otolaryngology Physician 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 Otolaryngology 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).
Gustavo Diaz-Reyes, MD appears in the CMS NPPES registry as a Otolaryngology Physician provider holding MD credentials at 4100 EVERETT DR, Kyle, TX, 78640, with a listed phone of (512) 295-1333. NPI 1588652168 was issued on 10/08/2005.
Medicare Part D records for calendar year 2023 show 145 prescription claims written by this provider, covering 63 Medicare beneficiaries and totaling roughly $3K in drug spend, split 10% brand-name and 90% generic by claim count.
Otolaryngology Physician is a mid-sized specialty nationwide, with 10,895 enrolled providers across 54 states and an average of 509 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 | 1588652168 |
|---|---|
| Specialty | Otolaryngology Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 10/08/2005 |
Hospital and facility affiliations
Facilities where Gustavo Diaz-Reyes, 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.
Austin Regional Clinic PA
Kyle, 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 Gustavo Diaz-Reyes, MD. To verify Gustavo Diaz-Reyes, 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.
Brand vs generic prescribing mix · Typical
Gustavo Diaz-Reyes, MD - brand share 10.0%
Otolaryngology Physician average
10% brand-name claims vs 90% generic, on 145 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.
145
Total Claims
$3K
Total Drug Cost
63
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 196
- Total Day Supply
- 4,871
- Brand vs Generic
- 10% brand / 90% generic
- Brand Drug Cost
- $692
- Generic Drug Cost
- $2K
- Antibiotic Claims
- 17
Patient Demographics
- Average Patient Age
- 72.5 years
- Avg HCC Risk Score
- 1.17
- Gender Split
- 59% female / 41% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Gustavo Diaz-Reyes, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Fluticasone Propio…
Fluticasone Propionate
39 claims
- Omeprazole
Omeprazole
22 claims
- Levothyroxine Sodium 12
Levothyroxine Sodium
12 claims
| Drug | Claims |
|---|---|
| Fluticasone Propionate | 39 |
| Omeprazole | 22 |
| Levothyroxine Sodium | 12 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Otolaryngology Physician Overview
How Gustavo Diaz-Reyes, MD fits within the Otolaryngology Physician landscape nationally.
10,895
Otolaryngology Physician Providers in US
54
States with Otolaryngology Physician
509
Avg Claims per Provider
Gustavo Diaz-Reyes, MD's 145 claims are below the specialty average of 509.
Nearby Otolaryngology Physician Providers in Texas
Other clinicians with the same primary specialty enrolled in Texas, drawn from the same CMS NPPES roster as Diaz-Reyes.
Dr. Jason Acevedo
MD
Abilene, TX
Jason Adams
Jbsa Ft Sam Houston, TX
Dr. Jane Admire
MD
Dallas, TX
Dr. Robert Africa
MD
Galveston, TX
Dr. Ashley Agan
MD
Dallas, TX
Compare Otolaryngology 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 Texas medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Otolaryngology 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 Gustavo Diaz-Reyes, MD's specialty? ▼
Gustavo Diaz-Reyes, MD specializes in Otolaryngology Physician and practices in Kyle, Texas. Credentials: MD.
How much does Gustavo Diaz-Reyes, MD prescribe under Medicare Part D? ▼
In 2023, Gustavo Diaz-Reyes, MD wrote 145 Medicare Part D claims totaling $3K in drug costs for 63 beneficiaries.
Where is Gustavo Diaz-Reyes, MD located? ▼
Gustavo Diaz-Reyes, MD is located at 4100 EVERETT DR, Kyle, TX, 78640. Phone: (512) 295-1333.
What is Gustavo Diaz-Reyes, MD's NPI number? ▼
Gustavo Diaz-Reyes, MD's National Provider Identifier (NPI) is 1588652168, issued on 10/08/2005.
Does Gustavo Diaz-Reyes, MD prescribe more brand-name or generic drugs? ▼
Gustavo Diaz-Reyes, MD's prescribing is 10% brand-name and 90% generic drugs by claim count, with $692 in brand drug costs.
How many Otolaryngology Physician providers are there in the US? ▼
There are 10,895 Otolaryngology Physician providers across 54 states in the US. The average Otolaryngology Physician provider writes 509 Medicare Part D claims per year.
What drugs does Gustavo Diaz-Reyes, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Gustavo Diaz-Reyes, MD's most frequently prescribed drugs include Fluticasone Propionate, Omeprazole, Levothyroxine Sodium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Gustavo Diaz-Reyes, MD accept Medicare? ▼
Gustavo Diaz-Reyes, MD appears in CMS Medicare data with 145 Part D claims and 63 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Gustavo Diaz-Reyes, MD's credentials? ▼
Gustavo Diaz-Reyes, MD's NPI is 1588652168 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.