NPI registry status
Active
2026 NPPES data Geriatric Medicine (Internal Medicine) Physician NPI 1306870696 M.D.
Verify on CMS → James Gierahn, M.D.
Geriatric Medicine (Internal Medicine) Physician in Racine, Wisconsin.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 4,161 in Geriatric Medicine (Internal 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
13K
Medicare Part D claims · 624 beneficiaries · Geriatric Medicine (Internal Medicine) Physician avg: 4K
Generic prescribing
80%
generic claims · 19% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
82.4/100
▼ 1 pts below national avg 83.1 · Above neutral
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
James Gierahn, M.D. reported a CMS MIPS final score of 82.4/100 - below the 83.1 national average - and filed 13,466 Medicare Part D claims in 2023.
- 82.4/100
- MIPS score · -1 vs avg
- 13K
- Part D claims, 2023
- 80%
- 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.
James Gierahn, M.D.'s MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
82 39th percentile higher than 39% of 477,587 scored providers
Each bar is a band; taller bars hold more scored providers. 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 Merit-based Incentive Payment System (MIPS) · 2023
Where James Gierahn, M.D. sits
This provider among geriatric medicine (internal medicine) physician peers
Across the 724 geriatric medicine (internal medicine) physician providers who report both Medicare Part D prescribing and a MIPS quality score, James Gierahn, M.D. writes more Part D claims than 91% of them and scores higher on MIPS quality than 42% - placing this provider in the high-volume, lower-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Part D claim volume vs MIPS quality, by specialty percentile
Each dot is one geriatric medicine (internal medicine) physician peer from a representative sample of 60; the gold marker is James Gierahn, M.D.. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
James Gierahn, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting - 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 James Gierahn, M.D.?
Near national averagePrimary specialty
Geriatric Medicine (Internal Medicine) Physician
Medicare Part D claims
13,466 203% vs specialty avg
MIPS final score
82.4/100 0.7 pts vs avg
Specialty distribution in Wisconsin
How Geriatric Medicine (Internal Medicine) Physician compares to other specialties among Wisconsin providers
Medicare quality performance, MIPS
James Gierahn, M.D.'s 2023 MIPS final score plotted against the Geriatric Medicine (Internal Medicine) Physician national average
- MIPS Final Score
- 82.4/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Geriatric Medicine (Internal Medicine) Physician) - 82.4/100 vs national avg 83.1
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).
James Gierahn, M.D. appears in the CMS NPPES registry as a Geriatric Medicine (Internal Medicine) Physician provider holding M.D. credentials at 1 MAIN ST, Racine, WI, 53403, with a listed phone of (262) 687-6100. NPI 1306870696 was issued on 07/10/2006.
Medicare Part D records for calendar year 2023 show 13,466 prescription claims written by this provider, covering 624 Medicare beneficiaries and totaling roughly $978K in drug spend, split 19% brand-name and 80% generic by claim count, with an opioid prescribing rate of 2.0%. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 82.4/100 for the 2023 performance year (Quality 77.9, Cost 74.4), compared with the national average of 83.1.
Geriatric Medicine (Internal Medicine) Physician is a narrow specialty nationwide, with 4,161 enrolled providers across 52 states and an average of 4,450 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 | 1306870696 |
|---|---|
| Specialty | Geriatric Medicine (Internal Medicine) Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 07/10/2006 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
82.3961
Final Score
Avg: 83.1
77.8816
Quality
74.3833
Cost
81
Promoting Interoperability
Reporting: Group practice
Brand vs generic prescribing mix · Typical
James Gierahn, M.D. - brand share 19.0%
Geriatric Medicine (Internal Medicine) Physician average
19% brand-name claims vs 80% generic, on 13,466 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.
13,466
Total Claims
$978K
Total Drug Cost
624
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 22,207
- Total Day Supply
- 605,434
- Brand vs Generic
- 19% brand / 80% generic
- Brand Drug Cost
- $732K
- Generic Drug Cost
- $242K
- Opioid Claims
- 269 (2.0% rate)
- Antibiotic Claims
- 258
Patient Demographics
- Average Patient Age
- 76.2 years
- Avg HCC Risk Score
- 1.82
- Gender Split
- 51% female / 49% male
- Age Distribution
- <65: 44, 65-74: 230, 75-84: 230, 85+: 120
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What James Gierahn, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Atorvastatin Calcium
Atorvastatin Calcium
891 claims
- Amlodipine Besylate
Amlodipine Besylate
574 claims
- Levothyroxine Sodium
Levothyroxine Sodium
569 claims
- Furosemide
Furosemide
484 claims
- Lisinopril
Lisinopril
482 claims
- Gabapentin
Gabapentin
376 claims
- Eliquis 318
Eliquis
318 claims
- Losartan Potassium 288
Losartan Potassium
288 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 891 |
| Amlodipine Besylate | 574 |
| Levothyroxine Sodium | 569 |
| Furosemide | 484 |
| Lisinopril | 482 |
| Gabapentin | 376 |
| Eliquis Apixaban | 318 |
| Losartan Potassium | 288 |
| Pantoprazole Sodium | 265 |
| Metoprolol Succinate | 264 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Geriatric Medicine (Internal Medicine) Physician in WI →
All providers in Wisconsin →
Compare specialties →
Geriatric Medicine (Internal Medicine) Physician Overview
How James Gierahn, M.D. fits within the Geriatric Medicine (Internal Medicine) Physician landscape nationally.
4,161
Geriatric Medicine (Internal Medicine) Physician Providers in US
52
States with Geriatric Medicine (Internal Medicine) Physician
4,450
Avg Claims per Provider
James Gierahn, M.D.'s 13,466 claims are above the specialty average of 4,450.
Nearby Geriatric Medicine (Internal Medicine) Physician Providers in Wisconsin
Other clinicians with the same primary specialty enrolled in Wisconsin, drawn from the same CMS NPPES roster as Gierahn.
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 Wisconsin medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Geriatric Medicine (Internal Medicine) 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 James Gierahn, M.D.'s specialty? ▼
James Gierahn, M.D. specializes in Geriatric Medicine (Internal Medicine) Physician and practices in Racine, Wisconsin. Credentials: M.D..
How much does James Gierahn, M.D. prescribe under Medicare Part D? ▼
In 2023, James Gierahn, M.D. wrote 13,466 Medicare Part D claims totaling $978K in drug costs for 624 beneficiaries.
What is James Gierahn, M.D.'s Medicare quality score? ▼
James Gierahn, M.D. has a CMS MIPS Final Score of 82.4/100 (Quality: 77.9, Cost: 74.4). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is James Gierahn, M.D. located? ▼
James Gierahn, M.D. is located at 1 MAIN ST, Racine, WI, 53403. Phone: (262) 687-6100.
What is James Gierahn, M.D.'s NPI number? ▼
James Gierahn, M.D.'s National Provider Identifier (NPI) is 1306870696, issued on 07/10/2006.
Does James Gierahn, M.D. prescribe more brand-name or generic drugs? ▼
James Gierahn, M.D.'s prescribing is 19% brand-name and 80% generic drugs by claim count, with $732K in brand drug costs.
Does James Gierahn, M.D. prescribe opioids? ▼
Yes, James Gierahn, M.D. had 269 opioid claims in 2023 with an opioid prescribing rate of 2.0%.
How many Geriatric Medicine (Internal Medicine) Physician providers are there in the US? ▼
There are 4,161 Geriatric Medicine (Internal Medicine) Physician providers across 52 states in the US. The average Geriatric Medicine (Internal Medicine) Physician provider writes 4,450 Medicare Part D claims per year.
What drugs does James Gierahn, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, James Gierahn, M.D.'s most frequently prescribed drugs include Atorvastatin Calcium, Amlodipine Besylate, Levothyroxine Sodium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does James Gierahn, M.D. accept Medicare? ▼
James Gierahn, M.D. appears in CMS Medicare data with 13,466 Part D claims and 624 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify James Gierahn, M.D.'s credentials? ▼
James Gierahn, M.D.'s NPI is 1306870696 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.
- Quality Performance
- CMS Merit-based Incentive Payment System (MIPS) - 2023 performance year.
- 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.