Itamar Gnatt, M.D
NPI 1447781992 · Undersea and Hyperbaric Medicine (Preventive Medicine) Physician · Milwaukee, WI
Enrolled with Medicare as Practitioner - Undersea and Hyperbaric Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Itamar Gnatt, M.D is a Undersea and Hyperbaric Medicine (Preventive Medicine) Physician provider in Milwaukee, WI (NPI 1447781992).
Provider details
- NPI number
- 1447781992
- Entity type
- Individual
- Primary specialty
- Undersea and Hyperbaric Medicine (Preventive Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D
- Sex
- Male
- Sole proprietor
- Yes
- License
- 70439-20 (WI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
9 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
366 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 135 | $57 |
| Management of Oxygen Chamber Therapy99183 | 99 | $95 |
| Removal of Tissue From Wound, 20.0 Sq Cm Or Less97597 | 58 | $33 |
| Initial Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 40 Minutes99221 | 40 | $76 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 34 | $73 |
Typical Medicare-allowed amounts for these services range $33–$95 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 4 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Doxycycline Hyclate | 40 | 28 |
| Levofloxacin | 19 | 13 |
| Cephalexin | 18 | 16 |
| Gentamicin Sulfate | 12 | — |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Additional practice locations (1)
- 6070 S Fort Apache Rd Ste 100Las Vegas, NV 89148-5615Phone: (702) 803-5534
Registry dates
- Enumerated
- 2017-03-27
- Last updated
- 2025-10-03
- Certified
- 2025-10-03
Frequently asked questions
- What is Itamar Gnatt's NPI number?
- Itamar Gnatt's National Provider Identifier (NPI) is 1447781992, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Itamar Gnatt's specialty?
- Itamar Gnatt is listed in the NPPES registry with a primary specialty of Undersea and Hyperbaric Medicine (Preventive Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is Itamar Gnatt located?
- Itamar Gnatt's practice location on file with NPPES is 945 N 12th St, Milwaukee, WI 53233-1305.
- What is Itamar Gnatt's phone number?
- The practice phone number listed in the NPPES registry for Itamar Gnatt is (414) 219-2000.
- Does Itamar Gnatt accept Medicare?
- Itamar Gnatt is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Itamar Gnatt's NPI active?
- Yes — Itamar Gnatt's NPI (1447781992) is active in the NPPES registry as of the last update on 2025-10-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.