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Stephen Maassen, MD
NPI 1972610426 · Family Medicine Physician · Oshkosh, WI
Stephen Maassen, MD is a Family Medicine Physician provider in Oshkosh, WI (NPI 1972610426).
Provider details
- NPI number
- 1972610426
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 25987 (WI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
Detailed profile(90/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 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
855 N Westhaven Dr
Oshkosh, WI 54904
Phone: (920) 303-8700
Fax: (920) 303-8832
Street-level locationGet directions
Mailing address
3301 W Forest Home Ave
Milwaukee, WI 53215-2843
Registry dates
- Enumerated
- 2006-08-23
- Last updated
- 2023-03-07
Frequently asked questions
- What is Stephen Maassen's NPI number?
- Stephen Maassen's National Provider Identifier (NPI) is 1972610426, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Stephen Maassen's specialty?
- Stephen Maassen is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Stephen Maassen located?
- Stephen Maassen's practice location on file with NPPES is 855 N Westhaven Dr, Oshkosh, WI 54904.
- What is Stephen Maassen's phone number?
- The practice phone number listed in the NPPES registry for Stephen Maassen is (920) 303-8700.
- Is Stephen Maassen's NPI active?
- Yes — Stephen Maassen's NPI (1972610426) is active in the NPPES registry as of the last update on 2023-03-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.