Dennis O'Neill, M.D.
NPI 1083679021 · Anatomic Pathology & Clinical Pathology Physician · Manchester, CT
Enrolled with Medicare as Practitioner - Pathology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Dennis O'Neill, M.D. is a Anatomic Pathology & Clinical Pathology Physician provider in Manchester, CT (NPI 1083679021).
Provider details
- NPI number
- 1083679021
- Entity type
- Individual
- Primary specialty
- Anatomic Pathology & Clinical Pathology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 023300 (CT)
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
20 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
1,623 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) |
|---|---|---|
| Pathology Examination of Tissue Using a Microscope, Intermediate Complexity88305 | 558 | $58 |
| Pathology Examination of Tissue Using a Microscope, Intermediate Complexity88305 | 411 | $37 |
| Special Stained Specimen Slides to Examine Tissue Including Interpretation and Report88313 | 194 | $45 |
| Special Stained Specimen Slides to Examine Tissue Including Interpretation and Report88313 | 180 | $12 |
| Special Stained Specimen Slides to Examine Tissue, Initial Procedure88342 | 88 | $35 |
| Special Stained Specimen Slides to Identify Organisms Including Interpretation and Report88312 | 75 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-04-20
- Last updated
- 2014-10-24
Frequently asked questions
- What is Dennis O'Neill's NPI number?
- Dennis O'Neill's National Provider Identifier (NPI) is 1083679021, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Dennis O'Neill's specialty?
- Dennis O'Neill is listed in the NPPES registry with a primary specialty of Anatomic Pathology & Clinical Pathology Physician (Allopathic & Osteopathic Physicians).
- Where is Dennis O'Neill located?
- Dennis O'Neill's practice location on file with NPPES is 71 Haynes St, Manchester, CT 06040-4131.
- What is Dennis O'Neill's phone number?
- The practice phone number listed in the NPPES registry for Dennis O'Neill is (860) 647-6487.
- Does Dennis O'Neill accept Medicare?
- Dennis 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 Dennis O'Neill's NPI active?
- Yes — Dennis O'Neill's NPI (1083679021) is active in the NPPES registry as of the last update on 2014-10-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.