Theresa Ruddy, M.D.
Theresa Ruddy, M.D. is a Colon & Rectal Surgery Physician in Liverpool, NY, registered under NPI 1841491099. 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 5100 W TAFT RD STE 4A, Liverpool, NY 13088. 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 |
|---|---|---|
| 18258-875 | WI | Colon & Rectal Surgery Physician primary |
| 255925 | NY | Trauma Surgery Physician |
| 255925 | NY | Surgery Physician |
| 255925 | NY | Colon & Rectal Surgery Physician |
Licences are recorded in 2 states: WI, NY. Providers licensed in several states often practise near a state border or deliver telehealth across state lines.
- Status
- Approved
- Provider type
- Practitioner - Colorectal Surgery (proctology)
- PAC ID
- 4082704572
Enrolled in Medicare 3 times, across 3 states:
| State | Enrollment ID | Provider type |
|---|---|---|
| New York | I20110103000866 | Practitioner - Colorectal Surgery (proctology) |
| Wisconsin | I20180629000029 | Practitioner - General Surgery |
| Vermont | I20180904003312 | Practitioner - General Surgery |
Medicare enrolment is recorded as approved under the provider type Practitioner - Colorectal Surgery (proctology). There are 3 separate enrolment records across 3 states (NY, WI, VT). 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 York and Wisconsin. The practice address on file is in Liverpool, NY, 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
- 255925
- Specialty
- Trauma Surgery 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 Colon & Rectal Surgery covers
A colon and rectal surgeon is trained to diagnose and treat various diseases of the intestinal tract, colon, rectum, anal canal and perianal area by medical and surgical means. This specialist also deals with other organs and tissues (such as the liver, urinary and female reproductive system) involved with primary intestinal disease. NUCC Health Care Provider Taxonomy, code 208C00000X
All registered taxonomy codes
This provider registers 4 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 208C00000X | Colon & Rectal Surgery Physician | 18258-875 | WI | primary |
| 2086S0127X | Trauma Surgery Physician Trauma Surgery | 255925 | NY | |
| 208600000X | Surgery Physician | 255925 | NY | |
| 208C00000X | Colon & Rectal Surgery Physician | 255925 | NY |
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 | 1841491099 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | May 29, 2007 |
| Last updated | Jun 11, 2018 |
| Status | Active |
| Sole proprietor | No |
| Credential | M.D. |
| Practice address |
5100 W TAFT RD STE 4A Liverpool, NY 13088 (315) 458-2211 Fax (315) 452-9025 |
| Other identifiers |
03280522
· Medicaid (NY) |
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 | 4 | 1 | 4 | 9 | 1 | 0 | 9 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 8 | 8 | 1 | 8 | 9 | 2 | 0 | 9 |
Sum = 71 · next multiple of 10 = 80 · 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.