T Mercuro, MD
T Mercuro, MD is a Cardiovascular Disease Physician in Princeton, NJ, registered under NPI 1851320634. This provider registers 3 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
The practice address on file is 389 WALL ST, Princeton, NJ 08540. 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 |
|---|---|---|
| 25MA04835700 | NJ | Cardiovascular Disease Physician primary |
| 25MA04835700 | NJ | Nuclear Cardiology Physician |
| 25MA04835700 | NJ | Interventional Cardiology Physician |
| MD040718E | PA | Cardiovascular Disease Physician |
| MD040718E | PA | Interventional Cardiology Physician |
| MD040718E | PA | Nuclear Cardiology Physician |
Licences are recorded in 2 states: NJ, PA. Providers licensed in several states often practise near a state border or deliver telehealth across state lines.
- Status
- Approved
- Provider type
- Practitioner - Cardiovascular Disease (cardiology)
- PAC ID
- 7719025436
Enrolled in Medicare 2 times, across 2 states:
| State | Enrollment ID | Provider type |
|---|---|---|
| New Jersey | I20091117000251 | Practitioner - Cardiovascular Disease (cardiology) |
| Pennsylvania | I20100615000787 | Practitioner - Interventional Cardiology |
Medicare enrolment is recorded as approved under the provider type Practitioner - Cardiovascular Disease (cardiology). There are 2 separate enrolment records across 2 states (NJ, PA). 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.
Licensed in 2 states
This provider holds licences in 2 states: New Jersey and Pennsylvania. The practice address on file is in Princeton, NJ, but a licence in another state usually means they see patients there too — either at a second location or by telehealth. If the address above is far from you, it is worth calling to ask whether they practise closer to where you live.
- Licence
- 25MA04835700
- Specialty
- Cardiovascular Disease Physician
- Licence
- MD040718E
- Specialty
- Cardiovascular Disease Physician
Licence numbers are self-reported to NPPES at registration. They do not confirm a licence is currently active, in good standing, or valid for the specialty shown — only the state board can tell you that, which is why we link to each one.
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
All registered taxonomy codes
This provider registers 6 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 207RC0000X | Cardiovascular Disease Physician Cardiovascular Disease | 25MA04835700 | NJ | primary |
| 207UN0901X | Nuclear Cardiology Physician Nuclear Cardiology | 25MA04835700 | NJ | |
| 207RI0011X | Interventional Cardiology Physician Interventional Cardiology | 25MA04835700 | NJ | |
| 207RC0000X | Cardiovascular Disease Physician Cardiovascular Disease | MD040718E | PA | |
| 207RI0011X | Interventional Cardiology Physician Interventional Cardiology | MD040718E | PA | |
| 207UN0901X | Nuclear Cardiology Physician Nuclear Cardiology | MD040718E | PA |
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 | 1851320634 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jul 2, 2006 |
| Last updated | Dec 23, 2025 |
| Status | Active |
| Sole proprietor | No |
| Credential | MD |
| Practice address |
389 WALL ST Princeton, NJ 08540 (609) 921-2800 Fax (609) 921-3499 |
| Other identifiers |
223258770
· Other 7634102 · Medicaid (NJ) 561376 · Other 0K1810 · Other 223258770 · Other 561376 · Other (PA) 223258770 · Other 223258770 · Other (NJ) 060022662 · Other 223258770 · Other 223258770 · Other P420654 · Other 0382725000 · Other 223258770 · Other 460972 · Other 0382725000 · Other (PA) 223258770 · Other |
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 | 8 | 5 | 1 | 3 | 2 | 0 | 6 | 3 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 8 | 1 | 1 | 6 | 2 | 0 | 6 | 6 |
Sum = 56 · next multiple of 10 = 60 · check digit = 4 · actual last digit = 4
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.