NPI registry status
Active
2026 NPPES data Undersea and Hyperbaric Medicine (Emergency Medicine) Physician NPI 1447781992 M.D
Verify on CMS → Itamar Gnatt, M.D
Undersea and Hyperbaric Medicine (Emergency Medicine) Physician in Milwaukee, 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 204 in Undersea and Hyperbaric Medicine (Emergency 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
128
Medicare Part D claims · 55 beneficiaries · Undersea and Hyperbaric Medicine (Emergency Medicine) Physician avg: 405
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Itamar Gnatt, M.D filed 128 Medicare Part D claims in 2024 as an Undersea and Hyperbaric Medicine (Emergency Medicine) Physician in Milwaukee, Wisconsin.
- 128
- Part D claims, 2024
- Likely
- board-certified (heuristic)
- ≥34th
- 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.
Federal trust snapshot
What official records show about Itamar Gnatt, M.D
Federal records show an active NPI with Medicare Part D prescribing activity — verifiable registry data, not a proprietary rating.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1447781992), first enumerated 03/27/2017.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 128 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- 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.
- Reported
Hospital affiliations
4 CMS Care Compare hospital affiliations on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- 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 1447781992 · Undersea and Hyperbaric Medicine (Emergency Medicine) Physician
NPI-10 · ENUM-RECENT · TAX-TRACE · RX-LIGHT · BOOK-THIN · PHOTO-ENUM
- NPI-10 1447781992
- ENUM-RECENT 2017
- TAX-TRACE 204
- RX-LIGHT 128
- BOOK-THIN 7 in Wisconsin
- PHOTO-ENUM Justin Seltzer · 2017
Itamar Gnatt, M.D's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
128 ≥ 34th percentile 34% of 1,416,883 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 · 2024
✓
Board certification likely (heuristic, not verified)
Itamar Gnatt, M.D practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 4 hospital affiliations - 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 Itamar Gnatt, M.D?
Quality data not reportedPrimary specialty
Undersea and Hyperbaric Medicine (Emergency Medicine) Physician
Medicare Part D claims
128 68% vs specialty avg
Specialty distribution in Wisconsin
How Undersea and Hyperbaric Medicine (Emergency Medicine) Physician compares to other specialties among Wisconsin 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 Undersea and Hyperbaric Medicine (Emergency 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 | 1447781992 |
|---|---|
| Specialty | Undersea and Hyperbaric Medicine (Emergency Medicine) Physician |
| Credentials | M.D |
| Gender | Male |
| NPI Issued | 03/27/2017 |
Hospital and facility affiliations
Facilities where Itamar Gnatt, 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.
According to CMS billing records, Itamar Gnatt, M.D is affiliated with 4 Medicare-billing facilities across 2 states.
Aurora Advanced Healthcare, Inc.
Grafton, WI
Aurora Medical Group, Inc.
Milwaukee, WI
Lakeshore Medical Clinic LLC
Cudahy, WI
Naz Wahab MD PC
Las Vegas, NV
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2024.
128
Total Claims
$2K
Total Drug Cost
55
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 128.167
- Total Day Supply
- 1,491
- Brand Drug Cost
- $0
- Generic Drug Cost
- $2K
- Antibiotic Claims
- 94
Patient Demographics
- Average Patient Age
- 74.7 years
- Avg HCC Risk Score
- 3.75
- Gender Split
- 45% female / 55% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Itamar Gnatt, M.D prescribes most
Top Medicare Part D drugs by claim count, 2024
- Doxycycline Hyclate
Doxycycline Hyclate
40 claims
- Levofloxacin
Levofloxacin
19 claims
- Cephalexin
Cephalexin
18 claims
- Gentamicin Sulfate 12
Gentamicin Sulfate
12 claims
| Drug | Claims |
|---|---|
| Doxycycline Hyclate | 40 |
| Levofloxacin | 19 |
| Cephalexin | 18 |
| Gentamicin Sulfate | 12 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Undersea and Hyperbaric Medicine (Emergency Medicine) Physician in WI →
All providers in Wisconsin →
Compare specialties →
Undersea and Hyperbaric Medicine (Emergency Medicine) Physician Overview
How Itamar Gnatt, M.D fits within the Undersea and Hyperbaric Medicine (Emergency Medicine) Physician landscape nationally.
204
Undersea and Hyperbaric Medicine (Emergency Medicine) Physician Providers in US
41
States with Undersea and Hyperbaric Medicine (Emergency Medicine) Physician
405
Avg Claims per Provider
Itamar Gnatt, M.D's 128 claims are below the specialty average of 405.
Nationwide Undersea and Hyperbaric Medicine (Emergency Medicine) Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Gnatt, both outside Wisconsin so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2017)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Undersea and Hyperbaric Medicine (Emergency Medicine) Physician Providers in Wisconsin
Other clinicians with the same primary specialty enrolled in Wisconsin, drawn from the same CMS NPPES roster as Gnatt.
One of 7 Undersea and Hyperbaric Medicine (Emergency Medicine) Physician providers enrolled in Wisconsin, 5 are shown here.
Frequently Asked Questions
What is Itamar Gnatt, M.D's specialty? ▼
Itamar Gnatt, M.D specializes in Undersea and Hyperbaric Medicine (Emergency Medicine) Physician and practices in Milwaukee, Wisconsin. Credentials: M.D.
How much does Itamar Gnatt, M.D prescribe under Medicare Part D? ▼
In 2024, Itamar Gnatt, M.D wrote 128 Medicare Part D claims totaling $2K in drug costs for 55 beneficiaries.
Where is Itamar Gnatt, M.D located? ▼
Itamar Gnatt, M.D is located at 945 N 12TH ST, Milwaukee, WI, 53233. Phone: (414) 219-2000.
What is Itamar Gnatt, M.D's NPI number? ▼
Itamar Gnatt, M.D's National Provider Identifier (NPI) is 1447781992, issued on 03/27/2017.
How many Undersea and Hyperbaric Medicine (Emergency Medicine) Physician providers are there in the US? ▼
There are 204 Undersea and Hyperbaric Medicine (Emergency Medicine) Physician providers across 41 states in the US. The average Undersea and Hyperbaric Medicine (Emergency Medicine) Physician provider writes 405 Medicare Part D claims per year.
What drugs does Itamar Gnatt, M.D prescribe most often? ▼
Based on 2024 Medicare Part D data, Itamar Gnatt, M.D's most frequently prescribed drugs include Doxycycline Hyclate, Levofloxacin, Cephalexin. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Itamar Gnatt, M.D accept Medicare? ▼
Itamar Gnatt, M.D appears in CMS Medicare data with 128 Part D claims and 55 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Itamar Gnatt, M.D's credentials? ▼
Itamar Gnatt, M.D's NPI is 1447781992 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.
- 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
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.