Mark Pennington, M.D.
Mark Pennington, M.D. is a Procedural Dermatology Physician in New Britain, CT, registered under NPI 1720080476. This provider registers 2 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
The practice address on file is 1 LAKE ST GROVE HILL MEDICAL CENTER, New Britain, CT 06052. 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 |
|---|---|---|
| 043011 | CT | Procedural Dermatology Physician primary |
| 043011 | CT | Dermatology Physician |
This provider holds licence 043011 issued in CT. 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 - Dermatology
- PAC ID
- 1052353364
- Enrollment ID
- I20050526000542
Medicare enrolment is recorded as approved under the provider type Practitioner - Dermatology. 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 Procedural Dermatology covers
Procedural Dermatology, a subspecialty of Dermatology, encompassing a wide variety of surgical procedures and methods to remove or modify skin tissue for health or cosmetic benefit. These methods include scalpel surgery, laser surgery, chemical surgery, cryosurgery (liquid nitrogen), electrosurgery, aspiration surgery, liposuction, injection of filler substances, and Mohs micrographic controlled surgery (a special technique for the removal of growths, especially skin cancers). NUCC Health Care Provider Taxonomy, code 207NS0135X
All registered taxonomy codes
This provider registers 2 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 207NS0135X | Procedural Dermatology Physician Procedural Dermatology | 043011 | CT | primary |
| 207N00000X | Dermatology Physician | 043011 | CT |
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 | 1720080476 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Aug 12, 2005 |
| Last updated | Sep 11, 2025 |
| Status | Active |
| Sole proprietor | No |
| Credential | M.D. |
| Practice address |
1 LAKE ST GROVE HILL MEDICAL CENTER New Britain, CT 06052 (860) 348-4242 Fax (860) 348-4646 |
| Mailing address |
300 KENSINGTON AVE GROVE HILL MEDICAL CENTER New Britain, CT 06051 |
| Other identifiers |
P00311000
· Other (CT) 1255448155 · Other (CT) 5713161 · Other (CT) 043011 · Other (CT) 3961986 · Other (CT) 368233 · Other (CT) 010043011CT01 · Other (CT) 2V6529 · Other (CT) P3616072 · Other (CT) |
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 | 7 | 2 | 0 | 0 | 8 | 0 | 4 | 7 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 7 | 4 | 0 | 0 | 8 | 0 | 4 | 5 |
Sum = 54 · next multiple of 10 = 60 · check digit = 6 · actual last digit = 6
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.