NPI registry status
Active
2026 NPPES data Nurse Practitioner NPI 1225592074 ARNP
Verify on CMS → Carol Barlow, ARNP
Nurse Practitioner in Marshalltown, Iowa.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 87,227 in Nurse Practitioner, 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
8K
Medicare Part D claims · 503 beneficiaries · Nurse Practitioner avg: 1K
Generic prescribing
89%
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
Carol Barlow, ARNP filed 7,507 Medicare Part D claims in 2023 as a Nurse Practitioner in Marshalltown, Iowa, prescribing 89% generic.
- 8K
- Part D claims, 2023
- 89%
- 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.
Carol Barlow, ARNP's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
7,507 Top 3% higher than 97% 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 Carol Barlow, ARNP?
Quality data not reportedPrimary specialty
Nurse Practitioner
Medicare Part D claims
7,507 7× vs specialty avg
Specialty distribution in Iowa
How Nurse Practitioner compares to other specialties among Iowa 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 Nurse Practitioner. 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).
Carol Barlow, ARNP appears in the CMS NPPES registry as a Nurse Practitioner provider holding ARNP credentials at 421 E MERLE HIBBS BLVD, Marshalltown, IA, 50158, with a listed phone of (641) 752-5469. NPI 1225592074 was issued on 01/25/2019.
Medicare Part D records for calendar year 2023 show 7,507 prescription claims written by this provider, covering 503 Medicare beneficiaries and totaling roughly $585K in drug spend, split 10% brand-name and 89% generic by claim count, with an opioid prescribing rate of 3.5%.
Nurse Practitioner is a high-volume specialty nationwide, with 87,227 enrolled providers across 56 states and an average of 1,084 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 | 1225592074 |
|---|---|
| Specialty | Nurse Practitioner |
| Credentials | ARNP |
| Gender | Female |
| NPI Issued | 01/25/2019 |
Hospital and facility affiliations
Facilities where Carol Barlow, ARNP 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.
Mcfarland Clinic PC
Ames, IA
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Brand vs generic prescribing mix · Typical
Carol Barlow, ARNP - brand share 10.0%
Nurse Practitioner average
10% brand-name claims vs 89% generic, on 7,507 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.
7,507
Total Claims
$585K
Total Drug Cost
503
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 16,603
- Total Day Supply
- 481,966
- Brand vs Generic
- 10% brand / 89% generic
- Brand Drug Cost
- $458K
- Generic Drug Cost
- $123K
- Opioid Claims
- 261 (3.5% rate)
- Antibiotic Claims
- 135
Patient Demographics
- Average Patient Age
- 73.1 years
- Avg HCC Risk Score
- 1.19
- Gender Split
- 59% female / 41% male
- Age Distribution
- <65: 49, 65-74: 230, 75-84: 153, 85+: 71
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Carol Barlow, ARNP prescribes most
Top Medicare Part D drugs by claim count, 2023
- Atorvastatin Calcium
Atorvastatin Calcium
526 claims
- Omeprazole
Omeprazole
352 claims
- Levothyroxine Sodium
Levothyroxine Sodium
345 claims
- Simvastatin
Simvastatin
282 claims
- Lisinopril
Lisinopril
237 claims
- Amlodipine Besylate 210
Amlodipine Besylate
210 claims
- Metoprolol Succinate 205
Metoprolol Succinate
205 claims
- Hydrochlorothiazide 164
Hydrochlorothiazide
164 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 526 |
| Omeprazole | 352 |
| Levothyroxine Sodium | 345 |
| Simvastatin | 282 |
| Lisinopril | 237 |
| Amlodipine Besylate | 210 |
| Metoprolol Succinate | 205 |
| Hydrochlorothiazide | 164 |
| Gabapentin | 156 |
| Losartan Potassium | 147 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Nurse Practitioner Overview
How Carol Barlow, ARNP fits within the Nurse Practitioner landscape nationally.
87,227
Nurse Practitioner Providers in US
56
States with Nurse Practitioner
1,084
Avg Claims per Provider
Carol Barlow, ARNP's 7,507 claims are above the specialty average of 1,084.
Nearby Nurse Practitioner Providers in Iowa
Other clinicians with the same primary specialty enrolled in Iowa, drawn from the same CMS NPPES roster as Barlow.
Jennifer Achenbach
Council Bluffs, IA
Dr. Elizabeth Ackerson
ARNP
Waterloo, IA
Dr. Anece Adam
ARNP
Iowa City, IA
Dr. Debra Adams
ARNP
Fort Dodge, IA
Dr. Kathleen Adams
ARNP
Des Moines, IA
Compare Nurse Practitioner 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 Iowa medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Nurse Practitioner 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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Frequently Asked Questions
What is Carol Barlow, ARNP's specialty? ▼
Carol Barlow, ARNP specializes in Nurse Practitioner and practices in Marshalltown, Iowa. Credentials: ARNP.
How much does Carol Barlow, ARNP prescribe under Medicare Part D? ▼
In 2023, Carol Barlow, ARNP wrote 7,507 Medicare Part D claims totaling $585K in drug costs for 503 beneficiaries.
Where is Carol Barlow, ARNP located? ▼
Carol Barlow, ARNP is located at 421 E MERLE HIBBS BLVD, Marshalltown, IA, 50158. Phone: (641) 752-5469.
What is Carol Barlow, ARNP's NPI number? ▼
Carol Barlow, ARNP's National Provider Identifier (NPI) is 1225592074, issued on 01/25/2019.
Does Carol Barlow, ARNP prescribe more brand-name or generic drugs? ▼
Carol Barlow, ARNP's prescribing is 10% brand-name and 89% generic drugs by claim count, with $458K in brand drug costs.
Does Carol Barlow, ARNP prescribe opioids? ▼
Yes, Carol Barlow, ARNP had 261 opioid claims in 2023 with an opioid prescribing rate of 3.5%.
How many Nurse Practitioner providers are there in the US? ▼
There are 87,227 Nurse Practitioner providers across 56 states in the US. The average Nurse Practitioner provider writes 1,084 Medicare Part D claims per year.
What drugs does Carol Barlow, ARNP prescribe most often? ▼
Based on 2023 Medicare Part D data, Carol Barlow, ARNP's most frequently prescribed drugs include Atorvastatin Calcium, Omeprazole, Levothyroxine Sodium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Carol Barlow, ARNP accept Medicare? ▼
Carol Barlow, ARNP appears in CMS Medicare data with 7,507 Part D claims and 503 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Carol Barlow, ARNP's credentials? ▼
Carol Barlow, ARNP's NPI is 1225592074 with credentials ARNP. 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.