Diarmuid O'Neill, MD
NPI 1750460424 · Anesthesiology Physician · Marshfield, WI
Enrolled with Medicare as Practitioner - Anesthesiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Diarmuid O'Neill, MD is a Anesthesiology Physician provider in Marshfield, WI (NPI 1750460424).
Provider details
- NPI number
- 1750460424
- Entity type
- Individual
- Primary specialty
- Anesthesiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 39422 (WI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
16 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) |
|---|---|---|
| Insertion of Artery Tube for Blood Sampling Or Infusion Through Skin36620 | 16 | $40 |
Typical Medicare-allowed amounts for these services range $40–$40 (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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-11-03
- Last updated
- 2023-02-13
- Certified
- 2023-02-13
Frequently asked questions
- What is Diarmuid O'Neill's NPI number?
- Diarmuid O'Neill's National Provider Identifier (NPI) is 1750460424, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Diarmuid O'Neill's specialty?
- Diarmuid O'Neill is listed in the NPPES registry with a primary specialty of Anesthesiology Physician (Allopathic & Osteopathic Physicians).
- Where is Diarmuid O'Neill located?
- Diarmuid O'Neill's practice location on file with NPPES is 1000 N Oak Ave, Marshfield, WI 54449-5703.
- What is Diarmuid O'Neill's phone number?
- The practice phone number listed in the NPPES registry for Diarmuid O'Neill is (715) 387-7179.
- Does Diarmuid O'Neill accept Medicare?
- Diarmuid O'Neill is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Diarmuid O'Neill's NPI active?
- Yes — Diarmuid O'Neill's NPI (1750460424) is active in the NPPES registry as of the last update on 2023-02-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.