Joan Duggan, M.D.
NPI 1891780300 · Infectious Disease Physician · Toledo, OH
Enrolled with Medicare as Practitioner - Infectious Disease · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Provider details
- NPI number
- 1891780300
- Entity type
- Individual
- Primary specialty
- Infectious Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- 35.063775 (OH)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
12 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
132 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Subsequent Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 25 Minutes99231 | 62 | $50 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 38 | $97 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 32 | $80 |
Typical Medicare-allowed amounts for these services range $50–$97 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 34 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Bictegrav/Emtricit/Tenofov Alabrand: Biktarvy | 414 | 47 |
| Dolutegravir Sodiumbrand: Tivicay | 121 | 17 |
| Emtricitabine/Tenofov Alafenambrand: Descovy | 114 | 17 |
| Atorvastatin Calcium | 94 | 17 |
| Amlodipine Besylate | 64 | 12 |
| Dolutegravir Sodium/Lamivudinebrand: Dovato | 31 | — |
Practice location
Mailing address
Additional practice locations (11)
- 5640 N Adrian HwyAdrian, MI 49221-8318Phone: (517) 577-0000
- 274 E Chicago StColdwater, MI 49036-2041Phone: (517) 279-5400
- 718 N Macomb StMonroe, MI 48162-7815Phone: (734) 240-8400
- 1200 Ralston AveDefiance, OH 43512-9908Phone: (419) 783-6955
- 501 Van Buren StFostoria, OH 44830-1534Phone: (419) 435-7734
- 715 S Taft AveFremont, OH 43420-3237Phone: (419) 332-7321
- 2801 Bay Park DrOregon, OH 43616-4920Phone: (419) 690-7900
- 5200 Harroun RdSylvania, OH 43560-2168Phone: (419) 824-1444
- 5700 Monroe St Unit 204bSylvania, OH 43560-2735Phone: (567) 585-0675Fax: (567) 585-0676
Registry dates
- Enumerated
- 2005-09-12
- Last updated
- 2026-02-05
- Certified
- 2026-02-05
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.