Mark Jacobs, MD
Mark Jacobs, MD is a Cardiovascular Disease Physician in Willimantic, CT, registered under NPI 1487638409.
Getting there
The practice address on file is 5 FOUNDERS ST STE 102, Willimantic, CT 06226. We have not yet mapped what surrounds this office — parking, transit, and nearby pharmacies are added as our data collection reaches each location.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| 9159 | NH | Cardiovascular Disease Physician primary |
This provider holds licence 9159 issued in NH. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
- Status
- Approved
- Provider type
- Practitioner - Cardiovascular Disease (cardiology)
- PAC ID
- 0941250765
Enrolled in Medicare 3 times, across 3 states:
| State | Enrollment ID | Provider type |
|---|---|---|
| New Hampshire | I20110209000392 | Practitioner - Cardiovascular Disease (cardiology) |
| Massachusetts | I20221104002382 | Practitioner - Cardiovascular Disease (cardiology) |
| Connecticut | I20221122002936 | Practitioner - Cardiovascular Disease (cardiology) |
Medicare enrolment is recorded as approved under the provider type Practitioner - Cardiovascular Disease (cardiology). There are 3 separate enrolment records across 3 states (NH, MA, CT). Multiple enrolments usually mean the provider bills Medicare from more than one practice location, or has kept an earlier enrolment after moving. Each record carries its own enrolment ID, listed above. Being enrolled means the provider can bill Medicare; it does not tell you whether they are currently accepting new Medicare patients. Call the office to confirm.
What Cardiovascular Disease covers
An internist who specializes in diseases of the heart and blood vessels and manages complex cardiac conditions such as heart attacks and life-threatening, abnormal heartbeat rhythms. NUCC Health Care Provider Taxonomy, code 207RC0000X
The taxonomy records how the provider classifies their own practice. It does not confirm which conditions they currently treat, whether they are accepting new patients, or which insurance they take — call the office for that.
Full NPPES record
An NPI-1 identifies a single person. It stays with the clinician for life, even if they move practice or change state, which is why the address on file can lag behind where they actually work today.
| NPI | 1487638409 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Dec 2, 2005 |
| Last updated | Aug 1, 2023 |
| Status | Active |
| Sole proprietor | No |
| Credential | MD |
| Practice address |
5 FOUNDERS ST STE 102 Willimantic, CT 06226 (860) 456-2898 |
| Mailing address |
PO BOX 1147 Portsmouth, NH 03802 |
Number check
How the check works, step by step
Every NPI carries a Luhn check digit — the same scheme used on credit cards. CMS prefixes the number with 80840 before computing it, which marks it as a US health identifier.
| Digit | 8 | 0 | 8 | 4 | 0 | 1 | 4 | 8 | 7 | 6 | 3 | 8 | 4 | 0 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 4 | 7 | 7 | 3 | 3 | 7 | 4 | 0 |
Sum = 61 · next multiple of 10 = 70 · check digit = 9 · actual last digit = 9
A valid check digit only means the number is well-formed. It does not mean the provider is licensed, active, or in good standing — those are separate questions answered by the sections above.