DAVID J UNDERHILL (MD) – Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician, NPI 1851398127
Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician
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Profile Insights
NPPES metrics only — not quality of care.
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Provider Addresses for DAVID J UNDERHILL (MD)
Medical Office Building, 85, Seymour Street, Frog Hollow Historic District, Hartford, Hartford County, Connecticut, 06106, United States
SUITE 725
HARTFORD, CT 061065501
Phone: (860) 524-5905
Fax: (860) 522-3951
Mailing address matches the actual address.
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
No Open Payments data available for this provider.
This can happen when there are no reportable CMS Open Payments records.
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: 2010-08-18
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 |
|---|---|---|---|---|
| I20100818000183 | I | Cardiac Surgery | 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.
No Medicare fee-for-service utilization data available for this provider in our database.
Insurance plans in this area (ZIP 06106)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| CARDIAC SURGERY | CT | 33405 | Replacement of left lower heart chamber valve using artificial valve on heart-lung machine | 11 | 11 |
| CARDIAC SURGERY | CT | 33518 | Combined multiple vein and artery heart artery bypasses | 12 | 12 |
| CARDIAC SURGERY | CT | 33533 | Heart artery bypass to repair one artery | 28 | 28 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| - | CT | |
| Nurse Practitioner | CT | |
| Nurse Practitioner | CT | |
| - | CT | |
| - | CT | |
| - | CT | |
| Internal Medicine | CT | |
| Internal Medicine | CT | |
| Nurse Practitioner | CT | |
| Cardiac Electrophysiology, Cardiovascular Disease (Cardiology) | CT |
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