Joan Duggan, M.D.
Joan Duggan, M.D. is an Infectious Disease Physician in Toledo, OH, registered under NPI 1891780300. 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 3125 TRANSVERSE DR., Toledo, OH 43614. 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 |
|---|---|---|
| 35063775 | OH | Infectious Disease Physician primary |
| 35.063775 | OH | Internal Medicine Physician |
This provider holds licence 35063775 issued in OH. 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 - Infectious Disease
- PAC ID
- 5193612554
Enrolled in Medicare 2 times, across 2 states:
| State | Enrollment ID | Provider type |
|---|---|---|
| Ohio | I20040301000943 | Practitioner - Infectious Disease |
| Michigan | I20220222001791 | Practitioner - Infectious Disease |
Medicare enrolment is recorded as approved under the provider type Practitioner - Infectious Disease. There are 2 separate enrolment records across 2 states (OH, MI). 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 Infectious Disease covers
An internist who deals with infectious diseases of all types and in all organ systems. Conditions requiring selective use of antibiotics call for this special skill. This physician often diagnoses and treats AIDS patients and patients with fevers which have not been explained. Infectious disease specialists may also have expertise in preventive medicine and travel medicine. NUCC Health Care Provider Taxonomy, code 207RI0200X
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 | |
|---|---|---|---|---|
| 207RI0200X | Infectious Disease Physician Infectious Disease | 35063775 | OH | primary |
| 207R00000X | Internal Medicine Physician | 35.063775 | OH |
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 | 1891780300 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Sep 12, 2005 |
| Last updated | Feb 5, 2026 |
| Status | Active |
| Sole proprietor | No |
| Credential | M.D. |
| Practice address |
3125 TRANSVERSE DR. Toledo, OH 43614 (419) 383-3780 Fax (419) 383-2852 |
| Mailing address |
3000 ARLINGTON AVE STOP 1108 Toledo, OH 43614 |
| Other identifiers |
0181137
· Medicaid (OH) |
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 | 9 | 1 | 7 | 8 | 0 | 3 | 0 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 8 | 9 | 1 | 5 | 8 | 0 | 3 | 0 |
Sum = 60 · next multiple of 10 = 60 · check digit = 0 · actual last digit = 0
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.