NPI registry status
Active
2026 NPPES data Student in an Organized Health Care Education/Training Program NPI 1447577184
Verify on CMS → Brennan O'Brien
Student in an Organized Health Care Education/Training Program in Natchez, Mississippi.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 331,274 in Student in an Organized Health Care Education/Training Program, 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
495
Medicare Part D claims · 256 beneficiaries · Student in an Organized Health Care Education/Training Program avg: 459
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Brennan O'Brien filed 495 Medicare Part D claims in 2023 as a Student in an Organized Health Care Education/Training Program in Natchez, Mississippi.
- 495
- 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.
Brennan O'Brien's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
495 Top 38% higher than 62% 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 Brennan O'Brien?
Quality data not reportedPrimary specialty
Student in an Organized Health Care Education/Training Program
Medicare Part D claims
495 8% vs specialty avg
Specialty distribution in Mississippi
How Student in an Organized Health Care Education/Training Program compares to other specialties among Mississippi 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 Student in an Organized Health Care Education/Training Program. 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).
Brennan O'Brien appears in the CMS NPPES registry as a Student in an Organized Health Care Education/Training Program provider at 317 HIGHLAND BLVD STE C, Natchez, MS, 39120, with a listed phone of (601) 445-8904. NPI 1447577184 was issued on 04/20/2010.
Medicare Part D records for calendar year 2023 show 495 prescription claims written by this provider, covering 256 Medicare beneficiaries and totaling roughly $2K in drug spend, with an opioid prescribing rate of 29.5%.
Student in an Organized Health Care Education/Training Program is a high-volume specialty nationwide, with 331,274 enrolled providers across 55 states and an average of 459 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 | 1447577184 |
|---|---|
| Specialty | Student in an Organized Health Care Education/Training Program |
| Gender | Male |
| NPI Issued | 04/20/2010 |
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
495
Total Claims
$2K
Total Drug Cost
256
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 495
- Total Day Supply
- 3,054
- Generic Drug Cost
- $2K
- Opioid Claims
- 146 (29.5% rate)
- Antibiotic Claims
- 278
Patient Demographics
- Average Patient Age
- 66.5 years
- Avg HCC Risk Score
- 1.31
- Gender Split
- 59% female / 41% male
- Age Distribution
- <65: 79, 65-74: 124, 75-84: N/A, 85+: N/A
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Brennan O'Brien prescribes most
Top Medicare Part D drugs by claim count, 2023
- Amoxicillin
Amoxicillin
236 claims
- Hydrocodone-Acetam…
Hydrocodone-Acetaminophen
124 claims
- Ibuprofen 36
Ibuprofen
36 claims
- Cephalexin 24
Cephalexin
24 claims
- Tramadol Hcl 22
Tramadol Hcl
22 claims
- Methylprednisolone 11
Methylprednisolone
11 claims
| Drug | Claims |
|---|---|
| Amoxicillin | 236 |
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 124 |
| Ibuprofen | 36 |
| Cephalexin | 24 |
| Tramadol Hcl | 22 |
| Methylprednisolone | 11 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Student in an Organized Health Care Education/Training Program in MS →
All providers in Mississippi →
Compare specialties →
Student in an Organized Health Care Education/Training Program Overview
How Brennan O'Brien fits within the Student in an Organized Health Care Education/Training Program landscape nationally.
331,274
Student in an Organized Health Care Education/Training Program Providers in US
55
States with Student in an Organized Health Care Education/Training Program
459
Avg Claims per Provider
Brennan O'Brien's 495 claims are above the specialty average of 459.
Nearby Student in an Organized Health Care Education/Training Program Providers in Mississippi
Other clinicians with the same primary specialty enrolled in Mississippi, drawn from the same CMS NPPES roster as O'Brien.
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 Mississippi medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Student in an Organized Health Care Education/Training Program 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.
Healthcare Guides
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Medical Specialties Explained
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Understanding Medicare Claims Data
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How insurance networks affect your costs
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Frequently Asked Questions
What is Brennan O'Brien's specialty? ▼
Brennan O'Brien specializes in Student in an Organized Health Care Education/Training Program and practices in Natchez, Mississippi.
How much does Brennan O'Brien prescribe under Medicare Part D? ▼
In 2023, Brennan O'Brien wrote 495 Medicare Part D claims totaling $2K in drug costs for 256 beneficiaries.
Where is Brennan O'Brien located? ▼
Brennan O'Brien is located at 317 HIGHLAND BLVD STE C, Natchez, MS, 39120. Phone: (601) 445-8904.
What is Brennan O'Brien's NPI number? ▼
Brennan O'Brien's National Provider Identifier (NPI) is 1447577184, issued on 04/20/2010.
Does Brennan O'Brien prescribe opioids? ▼
Yes, Brennan O'Brien had 146 opioid claims in 2023 with an opioid prescribing rate of 29.5%.
How many Student in an Organized Health Care Education/Training Program providers are there in the US? ▼
There are 331,274 Student in an Organized Health Care Education/Training Program providers across 55 states in the US. The average Student in an Organized Health Care Education/Training Program provider writes 459 Medicare Part D claims per year.
What drugs does Brennan O'Brien prescribe most often? ▼
Based on 2023 Medicare Part D data, Brennan O'Brien's most frequently prescribed drugs include Amoxicillin, Hydrocodone-Acetaminophen, Ibuprofen. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Brennan O'Brien accept Medicare? ▼
Brennan O'Brien appears in CMS Medicare data with 495 Part D claims and 256 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Brennan O'Brien's credentials? ▼
Brennan O'Brien's NPI is 1447577184. 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.