John Larson, RN
NPI 1811768294 · Addiction (Substance Use Disorder) Registered Nurse · Madison, WI
John Larson, RN is a Addiction (Substance Use Disorder) Registered Nurse provider in Madison, WI (NPI 1811768294).
Provider details
- NPI number
- 1811768294
- Entity type
- Individual
- Primary specialty
- Addiction (Substance Use Disorder) Registered NurseNursing Service Providers
- Credential
- RN
- Sex
- Male
- Sole proprietor
- No
- License
- 124859 (WI)
Specialties & taxonomies
Nursing Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
2 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
Mailing address
Registry dates
- Enumerated
- 2024-01-12
- Last updated
- 2024-01-12
- Certified
- 2024-01-12
Frequently asked questions
- What is John Larson's NPI number?
- John Larson's National Provider Identifier (NPI) is 1811768294, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Larson's specialty?
- John Larson is listed in the NPPES registry with a primary specialty of Addiction (Substance Use Disorder) Registered Nurse (Nursing Service Providers).
- Where is John Larson located?
- John Larson's practice location on file with NPPES is 210 E Olin Ave, Madison, WI 53713-1434.
- What is John Larson's phone number?
- The practice phone number listed in the NPPES registry for John Larson is (608) 807-1428.
- Is John Larson's NPI active?
- Yes — John Larson's NPI (1811768294) is active in the NPPES registry as of the last update on 2024-01-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.