Darren O'Neill, M.D.
NPI 1861434607 · Internal Medicine Physician · Enfield, CT
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Darren O'Neill, M.D. is a Internal Medicine Physician provider in Enfield, CT (NPI 1861434607).
Provider details
- NPI number
- 1861434607
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 36429 (CT)
Specialties & taxonomies
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
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
3,938 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 Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 1,177 | $132 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 655 | $94 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 511 | $17 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 371 | $135 |
| Anticoagulant Management of Patient Taking Warfarin93793 | 279 | $12 |
| Administration of Influenza Virus Vaccine |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 199 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 1,198 | 327 |
| Amlodipine Besylate | 785 | 212 |
| Omeprazole | 723 | 181 |
| Lisinopril | 703 | 179 |
| Gabapentin | 477 | 106 |
| Levothyroxine Sodium | 461 | 128 |
| Losartan Potassium |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-06-12
- Last updated
- 2026-05-19
- Certified
- 2026-05-19
Frequently asked questions
- What is Darren O'Neill's NPI number?
- Darren O'Neill's National Provider Identifier (NPI) is 1861434607, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Darren O'Neill's specialty?
- Darren O'Neill is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Darren O'Neill located?
- Darren O'Neill's practice location on file with NPPES is 701 Enfield St, Enfield, CT 06082-2961.
- What is Darren O'Neill's phone number?
- The practice phone number listed in the NPPES registry for Darren O'Neill is (860) 741-6058.
- Does Darren O'Neill accept Medicare?
- Darren 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 Darren O'Neill's NPI active?
- Yes — Darren O'Neill's NPI (1861434607) is active in the NPPES registry as of the last update on 2026-05-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.