NPI registry status
Active
2026 NPPES data Specialist NPI 1851323059 M.D.
Verify on CMS → Fernando Siles, M.D.
Specialist in Greenville, 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 69,567 in 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
4K
Medicare Part D claims · 213 beneficiaries · Specialist avg: 2K
Generic prescribing
96%
generic claims · 4% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$216.34
21 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Fernando Siles, M.D. filed 3,704 Medicare Part D claims in 2024 as a Specialist in Greenville, Texas, prescribing 96% generic.
- 4K
- Part D claims, 2024
- 96%
- generic prescribing
- $216.34
- industry payments (Sunshine Act)
- ≥91st
- 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 Fernando Siles, M.D.
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 1851323059), first enumerated 07/07/2006.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 3,704 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
Industry payment transparency
$216.34 in reported industry payments (21 transfers) in 2024 under the federal Sunshine Act — disclosed transfers of value, not a quality rating.
Source: CMS Open Payments
- State context
State board disciplinary context
Texas statewide board action statistics are published annually — these figures describe aggregate state activity, not Fernando Siles, M.D.'s individual license status. Verify directly with the state medical board.
Source: TMB 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 1851323059 · Specialist
NPI-10 · ENUM-LEGACY · TAX-MEGA · RX-MID · BOOK-LIGHT · PHOTO-ENUM
- NPI-10 1851323059
- ENUM-LEGACY 2006
- TAX-MEGA 70K Specialist
- RX-MID 3,704
- BOOK-LIGHT 2,380 in Texas
- PHOTO-ENUM Robert Yount, M.D. · 2006
Fernando Siles, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
3,704 ≥ 91st percentile 91% 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
What does the federal data show about Fernando Siles, M.D.?
Quality data not reportedPrimary specialty
Specialist
Medicare Part D claims
3,704 143% vs specialty avg
Specialty distribution in Texas
How 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 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).
Practice Address
Provider Details
| NPI | 1851323059 |
|---|---|
| Specialty | Specialist |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 07/07/2006 |
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for Fernando Siles, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$216
Largest payer
ABBVIE INC.
Most common payment type
Food and Beverage
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
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 Fernando Siles, M.D.. To verify Fernando Siles, M.D.'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 · Generic-heavy
Fernando Siles, M.D. - brand share 4.0%
Specialist average
4% brand-name claims vs 96% generic, on 3,704 2024 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 2024.
3,704
Total Claims
$313K
Total Drug Cost
213
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 4,037.733
- Total Day Supply
- 115,583
- Brand vs Generic
- 4% brand / 96% generic
- Brand Drug Cost
- $233K
- Generic Drug Cost
- $80K
- Opioid Claims
- 21 (0.6% rate)
- Antibiotic Claims
- 11
Patient Demographics
- Average Patient Age
- 56.0 years
- Avg HCC Risk Score
- 1.38
- Gender Split
- 58% female / 42% male
- Age Distribution
- <65: 145, 65-74: 57, 75-84: N/A, 85+: N/A
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Fernando Siles, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2024
- Clonazepam
Clonazepam
220 claims
- Trazodone Hcl
Trazodone Hcl
192 claims
- Risperidone
Risperidone
187 claims
- Quetiapine Fumarate
Quetiapine Fumarate
173 claims
- Sertraline Hcl
Sertraline Hcl
155 claims
- Alprazolam
Alprazolam
148 claims
- Buspirone Hcl
Buspirone Hcl
148 claims
- Duloxetine Hcl
Duloxetine Hcl
117 claims
| Drug | Claims |
|---|---|
| Clonazepam | 220 |
| Trazodone Hcl | 192 |
| Risperidone | 187 |
| Quetiapine Fumarate | 173 |
| Sertraline Hcl | 155 |
| Alprazolam | 148 |
| Buspirone Hcl | 148 |
| Duloxetine Hcl | 117 |
| Escitalopram Oxalate | 116 |
| Dextroamphetamine-Amphetamine Dextroamphetamine/Amphetamine | 115 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Specialist Overview
How Fernando Siles, M.D. fits within the Specialist landscape nationally.
69,567
Specialist Providers in US
55
States with Specialist
1,524
Avg Claims per Provider
Fernando Siles, M.D.'s 3,704 claims are above the specialty average of 1,524.
Nationwide Specialist peers with similar MIPS or enrollment year
Two federal-record peer sets for Siles, both outside Texas so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2006)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Specialist Providers in Texas
Other clinicians with the same primary specialty enrolled in Texas, drawn from the same CMS NPPES roster as Siles.
One of 2,380 Specialist providers enrolled in Texas, 5 are shown here.
Beverly Abbott
Longview, TX
Dr. Magdy Abdelsayed
M.D.
Baytown, TX
Robin Abels
OTR
Carrollton, TX
Dr. Amr Abouleish
M.D.
Galveston, TX
Paul Abrell
ATC, L
El Paso, TX
Compare Specialist nationally: see state-by-state distribution →
Frequently Asked Questions
What is Fernando Siles, M.D.'s specialty? ▼
Fernando Siles, M.D. specializes in Specialist and practices in Greenville, Texas. Credentials: M.D..
How much does Fernando Siles, M.D. prescribe under Medicare Part D? ▼
In 2024, Fernando Siles, M.D. wrote 3,704 Medicare Part D claims totaling $313K in drug costs for 213 beneficiaries.
Where is Fernando Siles, M.D. located? ▼
Fernando Siles, M.D. is located at 2405 STONEWALL ST, Greenville, TX, 75401. Phone: (903) 454-3300.
What is Fernando Siles, M.D.'s NPI number? ▼
Fernando Siles, M.D.'s National Provider Identifier (NPI) is 1851323059, issued on 07/07/2006.
Does Fernando Siles, M.D. prescribe more brand-name or generic drugs? ▼
Fernando Siles, M.D.'s prescribing is 4% brand-name and 96% generic drugs by claim count, with $233K in brand drug costs.
Does Fernando Siles, M.D. prescribe opioids? ▼
Yes, Fernando Siles, M.D. had 21 opioid claims in 2024 with an opioid prescribing rate of 0.6%.
How many Specialist providers are there in the US? ▼
There are 69,567 Specialist providers across 55 states in the US. The average Specialist provider writes 1,524 Medicare Part D claims per year.
What drugs does Fernando Siles, M.D. prescribe most often? ▼
Based on 2024 Medicare Part D data, Fernando Siles, M.D.'s most frequently prescribed drugs include Clonazepam, Trazodone Hcl, Risperidone. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Fernando Siles, M.D. accept Medicare? ▼
Fernando Siles, M.D. appears in CMS Medicare data with 3,704 Part D claims and 213 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Fernando Siles, M.D.'s credentials? ▼
Fernando Siles, M.D.'s NPI is 1851323059 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 (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.