DR. DENNIS G O'NEILL (M.D.) – Anatomic Pathology & Clinical Pathology Physician, NPI 1083679021
Anatomic Pathology & Clinical Pathology Physician
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Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
323 PATHOLOGY in CT
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Provider Addresses for DR. DENNIS G O'NEILL (M.D.)
PO BOX 206
NEW HAVEN, CT 065010206
Phone: (203) 397-8000
Fax: (203) 389-1540
Type: Mailing
Manchester Memorial Hospital, 71, Haynes Street, Manchester, Hartford County, Connecticut, 06040, United States
MANCHESTER, CT 060404131
Phone: (860) 647-6487
Fax: (860) 647-6447
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
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Open Payments (CMS)
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Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2010-10-26
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20101026000266 | I | Pathology | CT | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 88305 | Pathology examination of tissue using a microscope, intermediate complexity | 1,209 | 432 | $0 |
| 88313 | Special stained specimen slides to examine tissue including interpretation and report | 414 | 169 | $0 |
| 88342 | Special stained specimen slides to examine tissue, initial procedure | 194 | 144 | $0 |
| 88312 | Special stained specimen slides to identify organisms including interpretation and report | 124 | 75 | $0 |
| 88341 | Special stained specimen slides to examine tissue, each additional procedure | 73 | 18 | $0 |
Insurance plans in this area (ZIP 06501)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| PATHOLOGY | CT | 88304 | Pathology examination of tissue using a microscope, moderately low complexity | 54 | 50 |
| PATHOLOGY | CT | 88307 | Pathology examination of tissue using a microscope, moderately high complexity | 55 | 28 |
| PATHOLOGY | CT | 88342 | Tissue or cell analysis by immunologic technique | 263 | 214 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| Certified Registered Nurse Anesthetist (Crna) | CT | |
| Gastroenterology, Internal Medicine | CT | |
| - | NY | |
| Nurse Practitioner | CT | |
| Certified Registered Nurse Anesthetist (Crna) | NY | |
| G A S T R O E N T E R O L O G Y | CT | |
| P A T H O L O G Y | WA | |
| Internal Medicine, Gastroenterology | CT | |
| Physician Assistant | CT | |
| Certified Registered Nurse Anesthetist (Crna) | CT |
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