NPI registry status
Active
2026 NPPES data Obstetrics & Gynecology Physician NPI 1609222355
Verify on CMS → Brennan Anderson
Obstetrics & Gynecology Physician in Nampa, Idaho.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 44,326 in Obstetrics & Gynecology 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 · 34 beneficiaries · Obstetrics & Gynecology Physician avg: 179
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
Brennan Anderson filed 145 Medicare Part D claims in 2023 as a Obstetrics & Gynecology Physician in Nampa, Idaho, prescribing 90% generic.
- 145
- Part D claims, 2023
- 90%
- generic prescribing
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 Anderson'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-eligible specialty (heuristic, not verified)
Brennan Anderson 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 Brennan Anderson?
Quality data not reportedPrimary specialty
Obstetrics & Gynecology Physician
Medicare Part D claims
145 19% vs specialty avg
Specialty distribution in Idaho
How Obstetrics & Gynecology Physician compares to other specialties among Idaho 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 Obstetrics & Gynecology 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).
Brennan Anderson appears in the CMS NPPES registry as a Obstetrics & Gynecology Physician provider at 3908 E FLAMINGO AVE, Nampa, ID, 83687, with a listed phone of (208) 442-8035. NPI 1609222355 was issued on 05/12/2016.
Medicare Part D records for calendar year 2023 show 145 prescription claims written by this provider, covering 34 Medicare beneficiaries and totaling roughly $9K in drug spend, split 10% brand-name and 90% generic by claim count, with an opioid prescribing rate of 11.0%.
Obstetrics & Gynecology Physician is a mid-sized specialty nationwide, with 44,326 enrolled providers across 56 states and an average of 179 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 | 1609222355 |
|---|---|
| Specialty | Obstetrics & Gynecology Physician |
| Gender | Male |
| NPI Issued | 05/12/2016 |
Brand vs generic prescribing mix · Typical
Brennan Anderson - brand share 10.0%
Obstetrics & Gynecology 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
$9K
Total Drug Cost
34
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 194
- Total Day Supply
- 4,357
- Brand vs Generic
- 10% brand / 90% generic
- Brand Drug Cost
- $6K
- Generic Drug Cost
- $3K
- Opioid Claims
- 16 (11.0% rate)
Patient Demographics
- Average Patient Age
- 60.8 years
- Avg HCC Risk Score
- 1.02
- Gender Split
- 100% female / 0% male
- Age Distribution
- <65: 16, 65-74: 13, 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 Anderson prescribes most
Top Medicare Part D drugs by claim count, 2023
- Estradiol
Estradiol
19 claims
- Oxybutynin Chlorid…
Oxybutynin Chloride Er
16 claims
- Ibuprofen
Ibuprofen
15 claims
- Oxycodone-Acetamin…
Oxycodone-Acetaminophen
11 claims
| Drug | Claims |
|---|---|
| Estradiol | 19 |
| Oxybutynin Chloride Er Oxybutynin Chloride | 16 |
| Ibuprofen | 15 |
| Oxycodone-Acetaminophen Oxycodone Hcl/Acetaminophen | 11 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Obstetrics & Gynecology Physician Overview
How Brennan Anderson fits within the Obstetrics & Gynecology Physician landscape nationally.
44,326
Obstetrics & Gynecology Physician Providers in US
56
States with Obstetrics & Gynecology Physician
179
Avg Claims per Provider
Brennan Anderson's 145 claims are below the specialty average of 179.
Nearby Obstetrics & Gynecology Physician Providers in Idaho
Other clinicians with the same primary specialty enrolled in Idaho, drawn from the same CMS NPPES roster as Anderson.
Dr. Phillip Agrusa
MD
Meridian, ID
Dr. Kristin Algoe
M.D.
Sandpoint, ID
Dr. David Allen
MD
Twin Falls, ID
Dr. Christopher Allphin
M.D.
Idaho Falls, ID
Dr. Matthew Allred
D.O.
Rexburg, ID
Compare Obstetrics & Gynecology 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 Idaho medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Obstetrics & Gynecology 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 Brennan Anderson's specialty? ▼
Brennan Anderson specializes in Obstetrics & Gynecology Physician and practices in Nampa, Idaho.
How much does Brennan Anderson prescribe under Medicare Part D? ▼
In 2023, Brennan Anderson wrote 145 Medicare Part D claims totaling $9K in drug costs for 34 beneficiaries.
Where is Brennan Anderson located? ▼
Brennan Anderson is located at 3908 E FLAMINGO AVE, Nampa, ID, 83687. Phone: (208) 442-8035.
What is Brennan Anderson's NPI number? ▼
Brennan Anderson's National Provider Identifier (NPI) is 1609222355, issued on 05/12/2016.
Does Brennan Anderson prescribe more brand-name or generic drugs? ▼
Brennan Anderson's prescribing is 10% brand-name and 90% generic drugs by claim count, with $6K in brand drug costs.
Does Brennan Anderson prescribe opioids? ▼
Yes, Brennan Anderson had 16 opioid claims in 2023 with an opioid prescribing rate of 11.0%.
How many Obstetrics & Gynecology Physician providers are there in the US? ▼
There are 44,326 Obstetrics & Gynecology Physician providers across 56 states in the US. The average Obstetrics & Gynecology Physician provider writes 179 Medicare Part D claims per year.
What drugs does Brennan Anderson prescribe most often? ▼
Based on 2023 Medicare Part D data, Brennan Anderson's most frequently prescribed drugs include Estradiol, Oxybutynin Chloride Er, Ibuprofen. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Brennan Anderson accept Medicare? ▼
Brennan Anderson appears in CMS Medicare data with 145 Part D claims and 34 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Brennan Anderson's credentials? ▼
Brennan Anderson's NPI is 1609222355. 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.