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Tad Johnson, MD
NPI 1659339919 · Allergy Physician · Janesville, WI
Tad Johnson, MD is a Allergy Physician provider in Janesville, WI (NPI 1659339919).
Provider details
- NPI number
- 1659339919
- Entity type
- Individual
- Primary specialty
- Allergy PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 25307 (WI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
Detailed profile(91/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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.
Practice location
3524 E Milwaukee St
Janesville, WI 53546-1626
Phone: (608) 756-7100
Fax: (608) 756-4700
Street-level locationGet directions
Mailing address
3524 E Milwaukee St
Janesville, WI 53546-1626
Registry dates
- Enumerated
- 2006-05-03
- Last updated
- 2012-09-06
Frequently asked questions
- What is Tad Johnson's NPI number?
- Tad Johnson's National Provider Identifier (NPI) is 1659339919, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Tad Johnson's specialty?
- Tad Johnson is listed in the NPPES registry with a primary specialty of Allergy Physician (Allopathic & Osteopathic Physicians).
- Where is Tad Johnson located?
- Tad Johnson's practice location on file with NPPES is 3524 E Milwaukee St, Janesville, WI 53546-1626.
- What is Tad Johnson's phone number?
- The practice phone number listed in the NPPES registry for Tad Johnson is (608) 756-7100.
- Is Tad Johnson's NPI active?
- Yes — Tad Johnson's NPI (1659339919) is active in the NPPES registry as of the last update on 2012-09-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.