NPI registry status
Active
2026 NPPES data Neurology Physician NPI 1639157373 MD
Verify on CMS → Calvin Hansen, MD
Neurology Physician in Des Moines, 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 19,885 in Neurology 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
323
Medicare Part D claims · 36 beneficiaries · Neurology Physician avg: 1K
Generic prescribing
89%
generic claims · 11% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$134.64
4 payments · CMS Open Payments (Sunshine Act)
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
Calvin Hansen, MD filed 323 Medicare Part D claims in 2023 as a Neurology Physician in Des Moines, Iowa, prescribing 89% generic.
- 323
- Part D claims, 2023
- 89%
- 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.
Calvin Hansen, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
323 Top 43% higher than 57% 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)
Calvin Hansen, 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 Calvin Hansen, MD?
Quality data not reportedPrimary specialty
Neurology Physician
Medicare Part D claims
323 75% vs specialty avg
Specialty distribution in Iowa
How Neurology Physician 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 Neurology 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).
Calvin Hansen, MD appears in the CMS NPPES registry as a Neurology Physician provider holding MD credentials at 1221 PLEASANT ST, Des Moines, IA, 50309, with a listed phone of (515) 241-4200. NPI 1639157373 was issued on 01/04/2006.
Medicare Part D records for calendar year 2023 show 323 prescription claims written by this provider, covering 36 Medicare beneficiaries and totaling roughly $206K in drug spend, split 11% brand-name and 89% generic by claim count.
Neurology Physician is a mid-sized specialty nationwide, with 19,885 enrolled providers across 54 states and an average of 1,309 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 | 1639157373 |
|---|---|
| Specialty | Neurology Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 01/04/2006 |
Hospital and facility affiliations
Facilities where Calvin Hansen, 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.
Central Iowa Hospital Corporation
Des Moines, 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).
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 Calvin Hansen, MD. Source: openpaymentsdata.cms.gov.
Total received
$135
Largest payer
Biogen, 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.
Brand vs generic prescribing mix · Typical
Calvin Hansen, MD - brand share 11.0%
Neurology Physician average
11% brand-name claims vs 89% generic, on 323 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.
323
Total Claims
$206K
Total Drug Cost
36
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 444
- Total Day Supply
- 12,879
- Brand vs Generic
- 11% brand / 89% generic
- Brand Drug Cost
- $136K
- Generic Drug Cost
- $70K
Patient Demographics
- Average Patient Age
- 61.3 years
- Avg HCC Risk Score
- 1.61
- Gender Split
- 64% female / 36% male
- Age Distribution
- <65: 18, 65-74: 12, 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 Calvin Hansen, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Dalfampridine Er
Dalfampridine Er
47 claims
- Baclofen
Baclofen
43 claims
- Dimethyl Fumarate
Dimethyl Fumarate
22 claims
- Amantadine 13
Amantadine
13 claims
- Lacosamide 13
Lacosamide
13 claims
- Copaxone 12
Copaxone
12 claims
- Emgality Pen 11
Emgality Pen
11 claims
- Gabapentin 11
Gabapentin
11 claims
| Drug | Claims |
|---|---|
| Dalfampridine Er Dalfampridine | 47 |
| Baclofen | 43 |
| Dimethyl Fumarate | 22 |
| Amantadine Amantadine Hcl | 13 |
| Lacosamide | 13 |
| Copaxone Glatiramer Acetate | 12 |
| Emgality Pen Galcanezumab-Gnlm | 11 |
| Gabapentin | 11 |
| Nortriptyline Hcl | 11 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Neurology Physician Overview
How Calvin Hansen, MD fits within the Neurology Physician landscape nationally.
19,885
Neurology Physician Providers in US
54
States with Neurology Physician
1,309
Avg Claims per Provider
Calvin Hansen, MD's 323 claims are below the specialty average of 1,309.
Nearby Neurology Physician Providers in Iowa
Other clinicians with the same primary specialty enrolled in Iowa, drawn from the same CMS NPPES roster as Hansen.
Dr. Juan Acosta
MD
Ames, IA
Dr. Steve Adelman
DO
Des Moines, IA
Dr. Waseem Ahmad
MD
Davenport, IA
Dr. Sami Al Kasab
M.D.
Iowa City, IA
Dr. Georgina Aldridge
M.D. PH.D.
Iowa City, IA
Compare Neurology 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 Iowa medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Neurology 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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Medical Specialties Explained
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How insurance networks affect your costs
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Explore Iowa
Frequently Asked Questions
What is Calvin Hansen, MD's specialty? ▼
Calvin Hansen, MD specializes in Neurology Physician and practices in Des Moines, Iowa. Credentials: MD.
How much does Calvin Hansen, MD prescribe under Medicare Part D? ▼
In 2023, Calvin Hansen, MD wrote 323 Medicare Part D claims totaling $206K in drug costs for 36 beneficiaries.
Where is Calvin Hansen, MD located? ▼
Calvin Hansen, MD is located at 1221 PLEASANT ST, Des Moines, IA, 50309. Phone: (515) 241-4200.
What is Calvin Hansen, MD's NPI number? ▼
Calvin Hansen, MD's National Provider Identifier (NPI) is 1639157373, issued on 01/04/2006.
Does Calvin Hansen, MD prescribe more brand-name or generic drugs? ▼
Calvin Hansen, MD's prescribing is 11% brand-name and 89% generic drugs by claim count, with $136K in brand drug costs.
How many Neurology Physician providers are there in the US? ▼
There are 19,885 Neurology Physician providers across 54 states in the US. The average Neurology Physician provider writes 1,309 Medicare Part D claims per year.
What drugs does Calvin Hansen, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Calvin Hansen, MD's most frequently prescribed drugs include Dalfampridine Er, Baclofen, Dimethyl Fumarate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Calvin Hansen, MD accept Medicare? ▼
Calvin Hansen, MD appears in CMS Medicare data with 323 Part D claims and 36 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Calvin Hansen, MD's credentials? ▼
Calvin Hansen, MD's NPI is 1639157373 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.
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.