Michael Stassen, M.D.
NPI 1144257775 · Family Medicine Physician · Sioux Falls, SD
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Michael Stassen, M.D. is a Family Medicine Physician provider in Sioux Falls, SD (NPI 1144257775).
Provider details
- NPI number
- 1144257775
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 2218 (SD)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
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
Mailing address
Registry dates
- Enumerated
- 2006-06-27
- Last updated
- 2012-08-09
Frequently asked questions
- What is Michael Stassen's NPI number?
- Michael Stassen's National Provider Identifier (NPI) is 1144257775, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Michael Stassen's specialty?
- Michael Stassen is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Michael Stassen located?
- Michael Stassen's practice location on file with NPPES is 1200 S 7th Ave, Sioux Falls, SD 57105-0998.
- What is Michael Stassen's phone number?
- The practice phone number listed in the NPPES registry for Michael Stassen is (605) 336-2140.
- Does Michael Stassen accept Medicare?
- Michael Stassen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Michael Stassen's NPI active?
- Yes — Michael Stassen's NPI (1144257775) is active in the NPPES registry as of the last update on 2012-08-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.