NPI registry status
Active
2026 NPPES data Family Medicine Physician NPI 1598717688 M.D.
Verify on CMS → Chadwick Nachtman, M.D.
Family Medicine Physician in Dubuque, 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 147,760 in Family Medicine 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
11K
Medicare Part D claims · 665 beneficiaries · Family Medicine Physician avg: 3K
Generic prescribing
90%
generic claims · 9% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
Chadwick Nachtman, M.D. filed 11,206 Medicare Part D claims in 2023 as a Family Medicine Physician in Dubuque, Iowa, prescribing 90% generic.
- 11K
- Part D claims, 2023
- 90%
- generic prescribing
- Likely
- board-certified (heuristic)
- ≥98th
- 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.
CMS NPPES provider registry desk
NPI 1598717688 · Family Medicine Physician
NPI-10 · ENUM-LEGACY · TAX-MEGA · RX-HEAVY · BOOK-LIGHT · PHOTO-ENUM
- NPI-10 1598717688
- ENUM-LEGACY 2006
- TAX-MEGA 148K Family Medicine
- RX-HEAVY 11K claims
- BOOK-LIGHT 2,267 in Iowa
- PHOTO-ENUM Jeffrey Rasch · 2006
Chadwick Nachtman, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
11,206 ≥ 98th percentile 98% of 1,370,886 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 · 2023
✓
Board certification likely (heuristic, not verified)
Chadwick Nachtman, M.D. 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 Chadwick Nachtman, M.D.?
Quality data not reportedPrimary specialty
Family Medicine Physician
Medicare Part D claims
11,206 228% vs specialty avg
Specialty distribution in Iowa
How Family Medicine 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 Family Medicine 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).
Practice Address
Provider Details
| NPI | 1598717688 |
|---|---|
| Specialty | Family Medicine Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 05/17/2006 |
Hospital and facility affiliations
Facilities where Chadwick Nachtman, M.D. 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.
Medical Associates Clinic P C
Dubuque, 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 · Generic-heavy
Chadwick Nachtman, M.D. - brand share 9.0%
Family Medicine Physician average
9% brand-name claims vs 90% generic, on 11,206 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.
11,206
Total Claims
$650K
Total Drug Cost
665
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 23,478
- Total Day Supply
- 669,688
- Brand vs Generic
- 9% brand / 90% generic
- Brand Drug Cost
- $436K
- Generic Drug Cost
- $211K
- Opioid Claims
- 311 (2.8% rate)
- Antibiotic Claims
- 355
Patient Demographics
- Average Patient Age
- 73.1 years
- Avg HCC Risk Score
- 1.03
- Gender Split
- 47% female / 53% male
- Age Distribution
- <65: 58, 65-74: 353, 75-84: 159, 85+: 95
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Chadwick Nachtman, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Atorvastatin Calcium
Atorvastatin Calcium
758 claims
- Levothyroxine Sodium
Levothyroxine Sodium
532 claims
- Lisinopril
Lisinopril
495 claims
- Omeprazole
Omeprazole
443 claims
- Potassium Chloride
Potassium Chloride
372 claims
- Furosemide
Furosemide
348 claims
- Amlodipine Besylate
Amlodipine Besylate
326 claims
- Losartan Potassium
Losartan Potassium
317 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 758 |
| Levothyroxine Sodium | 532 |
| Lisinopril | 495 |
| Omeprazole | 443 |
| Potassium Chloride | 372 |
| Furosemide | 348 |
| Amlodipine Besylate | 326 |
| Losartan Potassium | 317 |
| Warfarin Sodium | 301 |
| Simvastatin | 253 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Family Medicine Physician Overview
How Chadwick Nachtman, M.D. fits within the Family Medicine Physician landscape nationally.
147,760
Family Medicine Physician Providers in US
56
States with Family Medicine Physician
3,418
Avg Claims per Provider
Chadwick Nachtman, M.D.'s 11,206 claims are above the specialty average of 3,418.
Nationwide Family Medicine Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Nachtman, both outside Iowa 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 Family Medicine Physician Providers in Iowa
Other clinicians with the same primary specialty enrolled in Iowa, drawn from the same CMS NPPES roster as Nachtman.
One of 2,267 Family Medicine Physician providers enrolled in Iowa, 5 are shown here.
Dr. Jennifer Aanestad
M.D.
Durant, IA
Dr. Amjad Abdelhady
MD
Sioux City, IA
Dr. Afsana Abdullah
D.O.
Bettendorf, IA
Dr. Raja Ali Abdullah
MD
Cedar Falls, IA
Dr. Laura Abels
DO
Ankeny, IA
Compare Family Medicine Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Chadwick Nachtman, M.D.'s specialty? ▼
Chadwick Nachtman, M.D. specializes in Family Medicine Physician and practices in Dubuque, Iowa. Credentials: M.D..
How much does Chadwick Nachtman, M.D. prescribe under Medicare Part D? ▼
In 2023, Chadwick Nachtman, M.D. wrote 11,206 Medicare Part D claims totaling $650K in drug costs for 665 beneficiaries.
Where is Chadwick Nachtman, M.D. located? ▼
Chadwick Nachtman, M.D. is located at 1000 LANGWORTHY ST, Dubuque, IA, 52001. Phone: (563) 584-3226.
What is Chadwick Nachtman, M.D.'s NPI number? ▼
Chadwick Nachtman, M.D.'s National Provider Identifier (NPI) is 1598717688, issued on 05/17/2006.
Does Chadwick Nachtman, M.D. prescribe more brand-name or generic drugs? ▼
Chadwick Nachtman, M.D.'s prescribing is 9% brand-name and 90% generic drugs by claim count, with $436K in brand drug costs.
Does Chadwick Nachtman, M.D. prescribe opioids? ▼
Yes, Chadwick Nachtman, M.D. had 311 opioid claims in 2023 with an opioid prescribing rate of 2.8%.
How many Family Medicine Physician providers are there in the US? ▼
There are 147,760 Family Medicine Physician providers across 56 states in the US. The average Family Medicine Physician provider writes 3,418 Medicare Part D claims per year.
What drugs does Chadwick Nachtman, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Chadwick Nachtman, M.D.'s most frequently prescribed drugs include Atorvastatin Calcium, Levothyroxine Sodium, Lisinopril. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Chadwick Nachtman, M.D. accept Medicare? ▼
Chadwick Nachtman, M.D. appears in CMS Medicare data with 11,206 Part D claims and 665 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Chadwick Nachtman, M.D.'s credentials? ▼
Chadwick Nachtman, M.D.'s NPI is 1598717688 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 (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
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.