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2026 NPPES data Geriatric Medicine (Internal Medicine) Physician NPI 1306870696 M.D.
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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 4,215 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
10K
Medicare Part D claims · 567 beneficiaries · Geriatric Medicine (Internal Medicine) Physician avg: 4K
Generic prescribing
79%
generic claims · 20% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
82.4/100
▼ 1 pts below national avg 83.5 · Above neutral
Verify NPI on CMS Methodology
Compiled from official public sources by the editorial process.

What the federal data shows

James Gierahn, M.D. reported a CMS MIPS final score of 82.4/100 - below the 83.5 national average - and filed 9,782 Medicare Part D claims in 2024.

82.4/100
MIPS score · -1 vs avg
10K
Part D claims, 2024
79%
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.

Federal trust snapshot

What official records show about James Gierahn, M.D.

Federal records show an active NPI with both Medicare prescribing volume and a measured CMS quality score — objective registry data, not patient reviews.

  • Verified

    NPI registry status

    Active listing in the CMS National Provider Identifier Registry (NPI 1306870696), first enumerated 07/10/2006.

    Source: CMS NPPES

  • Reported

    Medicare Part D participation

    Filed 9,782 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.

    Source: CMS Part D Prescriber PUF

  • Reported

    CMS quality reporting (MIPS)

    Reported a CMS MIPS final score of 82.4/100 in the Quality Payment Program — a federal quality measure, not a patient review.

    Source: CMS Quality Payment Program

  • Reported

    Board certification signal

    Heuristic suggests board-certified status based on ABMS-eligible specialty taxonomy plus active CMS participation signals — not a direct ABMS verification.

    Source: NUCC taxonomy + CMS participation heuristic

  • Not in federal data

    Individual sanction lookup

    PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.

    Source: State medical board / FSMB

This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.

CMS NPPES provider registry desk

NPI 1306870696 · Geriatric Medicine (Internal Medicine) Physician

NPI-10 · ENUM-LEGACY · TAX-NARROW · MIPS-INLINE · RX-MID · BOOK-THIN · PHOTO-FINISH

  • NPI-10 1306870696
  • ENUM-LEGACY 2006
  • TAX-NARROW 4,215
  • MIPS-INLINE 82.4/100
  • RX-MID 9,782
  • BOOK-THIN 75 in Wisconsin
  • PHOTO-FINISH Justin Balla, M.D. · ±0.0

MIPS final-score neighbourhood

Same-specialty nationwide peers by CMS final score, not geographic proximity

MIPS pts

What this shows Nearest measured MIPS peers for this NUCC specialty (2023 performance year).

Source CMS Quality Payment Program (MIPS) As of 2023

James Gierahn, M.D.'s MIPS score vs every measured U.S. clinician

CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure. Clinicians whose score CMS assigned without scoring any category are excluded.

82 ≥ 36th percentile 36% of 454,083 measured providers are in lower value bands

0–10: 8,684 measured providers (2%). Below this entry. 10–20: 3,008 measured providers (1%). Below this entry. 20–30: 3,069 measured providers (1%). Below this entry. 30–40: 2,746 measured providers (1%). Below this entry. 40–50: 2,928 measured providers (1%). Below this entry. 50–60: 5,882 measured providers (1%). Below this entry. 60–70: 13,906 measured providers (3%). Below this entry. 70–80: 94,570 measured providers (21%). Below this entry. 80–90: 129,887 measured providers (29%). This entry sits in this band. 90+: 189,403 measured providers (42%). Above this entry. This provider 0 100 every measured MIPS clinician, bucketed by value

Each bar is a band; taller bars hold more measured 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.

The percentile is a conservative whole-score-point band: it counts only measured clinicians in lower score bands. A CMS MIPS metric is not a recommendation or a clinical-quality rating by PlainDoctor. See methodology § corpus placement.

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 686 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 86% of them and scores higher on MIPS quality than 39% - placing this provider in the high-volume, lower-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.

Lower volume · High qualityHigh volume · High qualityLower volume · Lower qualityHigh volume · Lower quality02550751000255075100Part D claim volume, percentile in specialtyMIPS quality, percentilePoint, Part D claim volume, percentile in specialty: 37 · MIPS quality, percentile: 82Point, Part D claim volume, percentile in specialty: 5 · MIPS quality, percentile: 90Point, Part D claim volume, percentile in specialty: 93 · MIPS quality, percentile: 98Point, Part D claim volume, percentile in specialty: 0 · MIPS quality, percentile: 30Point, Part D claim volume, percentile in specialty: 85 · MIPS quality, percentile: 2Point, Part D claim volume, percentile in specialty: 38 · MIPS quality, percentile: 52Point, Part D claim volume, percentile in specialty: 77 · MIPS quality, percentile: 33Point, Part D claim volume, percentile in specialty: 63 · MIPS quality, percentile: 37Point, Part D claim volume, percentile in specialty: 67 · MIPS quality, percentile: 35Point, Part D claim volume, percentile in specialty: 48 · MIPS quality, percentile: 58Point, Part D claim volume, percentile in specialty: 65 · MIPS quality, percentile: 3Point, Part D claim volume, percentile in specialty: 82 · MIPS quality, percentile: 8Point, Part D claim volume, percentile in specialty: 33 · MIPS quality, percentile: 13Point, Part D claim volume, percentile in specialty: 25 · MIPS quality, percentile: 75Point, Part D claim volume, percentile in specialty: 12 · MIPS quality, percentile: 18Point, Part D claim volume, percentile in specialty: 97 · MIPS quality, percentile: 0Point, Part D claim volume, percentile in specialty: 83 · MIPS quality, percentile: 27Point, Part D claim volume, percentile in specialty: 30 · MIPS quality, percentile: 50Point, Part D claim volume, percentile in specialty: 88 · MIPS quality, percentile: 5Point, Part D claim volume, percentile in specialty: 78 · MIPS quality, percentile: 12Point, Part D claim volume, percentile in specialty: 57 · MIPS quality, percentile: 25Point, Part D claim volume, percentile in specialty: 32 · MIPS quality, percentile: 82Point, Part D claim volume, percentile in specialty: 42 · MIPS quality, percentile: 10Point, Part D claim volume, percentile in specialty: 20 · MIPS quality, percentile: 70Point, Part D claim volume, percentile in specialty: 28 · MIPS quality, percentile: 47Point, Part D claim volume, percentile in specialty: 18 · MIPS quality, percentile: 92Point, Part D claim volume, percentile in specialty: 100 · MIPS quality, percentile: 28Point, Part D claim volume, percentile in specialty: 35 · MIPS quality, percentile: 62Point, Part D claim volume, percentile in specialty: 45 · MIPS quality, percentile: 55Point, Part D claim volume, percentile in specialty: 73 · MIPS quality, percentile: 65Point, Part D claim volume, percentile in specialty: 95 · MIPS quality, percentile: 88Point, Part D claim volume, percentile in specialty: 52 · MIPS quality, percentile: 85Point, Part D claim volume, percentile in specialty: 50 · MIPS quality, percentile: 20Point, Part D claim volume, percentile in specialty: 47 · MIPS quality, percentile: 72Point, Part D claim volume, percentile in specialty: 68 · MIPS quality, percentile: 68Point, Part D claim volume, percentile in specialty: 10 · MIPS quality, percentile: 78Point, Part D claim volume, percentile in specialty: 3 · MIPS quality, percentile: 38Point, Part D claim volume, percentile in specialty: 70 · MIPS quality, percentile: 60Point, Part D claim volume, percentile in specialty: 43 · MIPS quality, percentile: 32Point, Part D claim volume, percentile in specialty: 8 · MIPS quality, percentile: 48Point, Part D claim volume, percentile in specialty: 90 · MIPS quality, percentile: 15Point, Part D claim volume, percentile in specialty: 13 · MIPS quality, percentile: 98Point, Part D claim volume, percentile in specialty: 17 · MIPS quality, percentile: 40Point, Part D claim volume, percentile in specialty: 40 · MIPS quality, percentile: 87Point, Part D claim volume, percentile in specialty: 15 · MIPS quality, percentile: 42Point, Part D claim volume, percentile in specialty: 55 · MIPS quality, percentile: 57Point, Part D claim volume, percentile in specialty: 53 · MIPS quality, percentile: 67Point, Part D claim volume, percentile in specialty: 22 · MIPS quality, percentile: 63Point, Part D claim volume, percentile in specialty: 7 · MIPS quality, percentile: 23Point, Part D claim volume, percentile in specialty: 58 · MIPS quality, percentile: 72Point, Part D claim volume, percentile in specialty: 2 · MIPS quality, percentile: 17Point, Part D claim volume, percentile in specialty: 60 · MIPS quality, percentile: 80Point, Part D claim volume, percentile in specialty: 72 · MIPS quality, percentile: 53Point, Part D claim volume, percentile in specialty: 98 · MIPS quality, percentile: 7Point, Part D claim volume, percentile in specialty: 75 · MIPS quality, percentile: 95Point, Part D claim volume, percentile in specialty: 92 · MIPS quality, percentile: 93Point, Part D claim volume, percentile in specialty: 80 · MIPS quality, percentile: 97Point, Part D claim volume, percentile in specialty: 27 · MIPS quality, percentile: 43Point, Part D claim volume, percentile in specialty: 62 · MIPS quality, percentile: 22Point, Part D claim volume, percentile in specialty: 23 · MIPS quality, percentile: 77James Gierahn, M.D., Part D claim volume, percentile in specialty: 86 · MIPS quality, percentile: 39
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 average

NPI registry status

Active

Issued 07/10/2006

NPI 1306870696

Primary specialty

Geriatric Medicine (Internal Medicine) Physician

Niche

4,215 US NPIs in this specialty

Medicare Part D claims

9,782 121% vs specialty avg

2024 prescription claims

Specialty avg: 4,420

MIPS final score

82.4/100 1.1 pts vs avg

Above neutral band

vs 83.5 national avg

Specialty distribution in Wisconsin

How Geriatric Medicine (Internal Medicine) Physician compares to other specialties among Wisconsin providers

Wisconsin providers
Physical Therapist5.5%Registered Nurse4.7%Pharmacist4.6%Student in an Organized Heal…3.4%Professional Counselor3.3%Speech-Language Pathologist3.2%Geriatric Medicine (Internal…0.1%
Largest specialties in Wisconsin (% of in-state providers)

Medicare quality performance, MIPS

James Gierahn, M.D.'s 2023 MIPS final score plotted against the Geriatric Medicine (Internal Medicine) Physician national average

Near national average
MIPS Final Score
82.4/100
vs 83.5 national avg · 2023 performance year
0%100%National avg84%82.4%
MIPS final score (Geriatric Medicine (Internal Medicine) Physician) - 82.4/100 vs national avg 83.5
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

1 MAIN ST
Racine, WI 53403
(262) 687-6100

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
Measured-score avg: 83.5
77.8816
Quality
74.3833
Cost
81
Promoting Interoperability

Reporting: Group practice

Brand vs generic prescribing mix · Typical

James Gierahn, M.D. - brand share 20.0%
Geriatric Medicine (Internal Medicine) Physician average

20% brand-name claims vs 79% generic, on 9,782 2024 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 2024.

9,782
Total Claims
$671K
Total Drug Cost
567
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
14,850.867
Total Day Supply
398,131
Brand vs Generic
20% brand / 79% generic
Brand Drug Cost
$483K
Generic Drug Cost
$185K
Opioid Claims
183 (1.9% rate)
Antibiotic Claims
239

Patient Demographics

Average Patient Age
76.6 years
Avg HCC Risk Score
1.91
Gender Split
50% female / 50% male
Age Distribution
<65: 38, 65-74: 195, 75-84: 223, 85+: 111

Top Prescribed Drugs (Medicare Part D)

Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.

What James Gierahn, M.D. prescribes most

Top Medicare Part D drugs by claim count, 2024

claims
Source CMS Medicare Part D Prescriber Public Use File As of 2024
Drug Claims
Atorvastatin Calcium
 642
Furosemide
 506
Amlodipine Besylate
 434
Levothyroxine Sodium
 374
Lisinopril
 287
Gabapentin
 258
Losartan Potassium
 245
Eliquis
Apixaban
226
Metoprolol Succinate
 203
Tamsulosin Hcl
 196

* 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.

4,215
Geriatric Medicine (Internal Medicine) Physician Providers in US
52
States with Geriatric Medicine (Internal Medicine) Physician
4,420
Avg Claims per Provider

James Gierahn, M.D.'s 9,782 claims are above the specialty average of 4,420.

Nationwide Geriatric Medicine (Internal Medicine) Physician peers with similar MIPS or enrollment year

Two federal-record peer sets for Gierahn, both outside Wisconsin so the neighborhoods are not geographic containment.

Similar MIPS final score

Nearest same-specialty clinicians by CMS MIPS final score (82.4 here).

Justin Balla 82.4 TX Dana Giza 82.4 TX Holly Holmes 82.4 TX Rachel Jantea 82.4 TX

Same NPPES enumeration year (2006)

Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.

Nirmala Nicholas Rochester, NY Dana Andrews Dublin, OH Jomarie Zeleznik Bronx, NY Vinod Gulati Amityville, NY

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.

One of 75 Geriatric Medicine (Internal Medicine) Physician providers enrolled in Wisconsin, 5 are shown here.

Dr. Omair Ahmed
MBBS, MD
Milwaukee, WI
Dr. Saima Akbar
M.D
West Allis, WI
Dr. Jenny Amani
M.D.
Janesville, WI
Dr. Shawn Antle
M.D.
Beloit, WI
Dr. Zaw Aung
M.D
Milwaukee, WI

Compare Geriatric Medicine (Internal Medicine) Physician nationally: see state-by-state distribution →

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 2024, James Gierahn, M.D. wrote 9,782 Medicare Part D claims totaling $671K in drug costs for 567 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 average MIPS Final Score across the 454,083 clinicians with at least one published category score is 83.5; clinicians whose score CMS assigned without scoring any category are excluded from that average. 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 20% brand-name and 79% generic drugs by claim count, with $483K in brand drug costs.
Does James Gierahn, M.D. prescribe opioids? ▼
Yes, James Gierahn, M.D. had 183 opioid claims in 2024 with an opioid prescribing rate of 1.9%.
How many Geriatric Medicine (Internal Medicine) Physician providers are there in the US? ▼
There are 4,215 Geriatric Medicine (Internal Medicine) Physician providers across 52 states in the US. The average Geriatric Medicine (Internal Medicine) Physician provider writes 4,420 Medicare Part D claims per year.
What drugs does James Gierahn, M.D. prescribe most often? ▼
Based on 2024 Medicare Part D data, James Gierahn, M.D.'s most frequently prescribed drugs include Atorvastatin Calcium, Furosemide, Amlodipine Besylate. 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 9,782 Part D claims and 567 Medicare beneficiaries in 2024. 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 (2024). 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 August 2026 (NPPES) / 2024 (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 editorial process.

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 August 2026.