James W O'brien, MD
Gastroenterology · Internal Medicine (CMS) · Manchester, CT
At a glance
353 Main St, Manchester, CT 06040-4145
Published activity: Colonoscopy · Upper gastrointestinal (GI) endoscopy for acid reflux. View counts and coverage
NPPES record updated May 1, 2025. Public records can lag behind changes at a practice.
Before you call: a quick checklist
- Are you accepting new patients?
- Do you accept my specific insurance plan?
- Do you provide the service I need at this address?
- Do I need a referral, and what is the earliest appointment?
Insurance participation and appointment availability are not established by these public records.
Medicare & insurance
Insurance participation is not established by these public records. Ask the practice and your insurer about your specific plan and this location.
How to check your coverage
Use your plan’s provider directory or the member-services number on your insurance card. Confirm the clinician, practice address, service, and whether a referral is required. A missing opt-out record does not establish Medicare acceptance.
Check the official Medicare directory ↗Practice location
353 Main StManchester, CT 06040-4145
Education & affiliations
- Medical / professional school
- Duke University School Of Medicine
- Graduation year
- 1991
- CMS specialties
- Gastroenterology · Internal Medicine
Practice groups
Reported hospital affiliations
- Adventist Health Castle Kailua, HI
- Pali Momi Medical Center Aiea, HI
- Straub Clinic And Hospital Honolulu, HI
- Wilcox Memorial Hospital Lihue, HI
Graduation year does not establish years in practice. A reported affiliation does not establish employment, current admitting privileges, or insurance participation.
Source: CMS National Downloadable File · Published Oct 15, 2026.
Source: CMS Facility Affiliation Data · Published Oct 15, 2026.
Procedures in the public data
Reported activity can help you ask more informed questions about a practice’s services.
| Procedure category | Published Medicare activity |
|---|---|
| Colonoscopy | 104 |
| Upper gastrointestinal (GI) endoscopy for acid reflux | 487 |
CMS uses a one-year claims window with a reporting lag. Counts cover the Medicare activity included by CMS, not all patients. “1–10” is a published range. Volume is not a quality or outcomes score. Coverage and methodology
Source: CMS Utilization Data · Published Oct 15, 2026.
Find providers with a similar service mix
Compare 2024 published Medicare activity in the same reported specialty, here or in another city.
Industry-reported general payments
Includes reported transfers of value, such as meals, travel, or consulting. Payments do not establish improper conduct or quality of care. Research funding and ownership values are excluded from this total.
See payment purposes and reporting companies
Reported purposes
| Purpose | Amount |
|---|---|
| Travel and lodging | $1,187.41 |
| Food and beverage | $111.12 |
Reporting companies
| Company | Amount |
|---|---|
| BOSTON SCIENTIFIC CORPORATION | $1,298.53 |
Source: CMS 2025 payments grouped by covered recipient and nature of payments · Published Jun 30, 2026.
Professional details: NPI, taxonomy & registry record
Registry details
- Primary taxonomy
- Gastroenterology · Internal Medicine (CMS)
- Taxonomy code
- 207RG0100X
- Enumeration date
- Dec 8, 2005
- Record updated
- May 1, 2025
More registry details
- Provider type
- Individual · Type 1
- Reported credentials
- MD
Reported taxonomies and licenses
207RG0100X
License reported: MD-19477 HI
207RG0100X · Primary
License reported: 035189 CT
License numbers and credentials are reported to NPPES; HCPList does not independently verify them.
Practice location
353 Main StManchester, CT 06040-4145
- Phone
- (860) 649-3477
Mailing address
353 MAIN STMANCHESTER, CT 060404145
Information may be outdated or incomplete. Confirm details directly with the practice. HCPList is an independent directory and is not affiliated with CMS.
Report a directory issue