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John Vassar, M.D.
NPI 1144248295 · Anesthesiology Physician · Aberdeen, SD
John Vassar, M.D. is a Anesthesiology Physician provider in Aberdeen, SD (NPI 1144248295).
Provider details
- NPI number
- 1144248295
- Entity type
- Individual
- Primary specialty
- Anesthesiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 5857 (SD)
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
305 S State St
Aberdeen, SD 57401-4527
Phone: (605) 622-5000
Fax: (605) 622-5127
Street-level locationGet directions
Mailing address
Po Box 1460
Aberdeen, SD 57402-1460
Registry dates
- Enumerated
- 2006-07-17
- Last updated
- 2015-07-09
Frequently asked questions
- What is John Vassar's NPI number?
- John Vassar's National Provider Identifier (NPI) is 1144248295, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Vassar's specialty?
- John Vassar is listed in the NPPES registry with a primary specialty of Anesthesiology Physician (Allopathic & Osteopathic Physicians).
- Where is John Vassar located?
- John Vassar's practice location on file with NPPES is 305 S State St, Aberdeen, SD 57401-4527.
- What is John Vassar's phone number?
- The practice phone number listed in the NPPES registry for John Vassar is (605) 622-5000.
- Is John Vassar's NPI active?
- Yes — John Vassar's NPI (1144248295) is active in the NPPES registry as of the last update on 2015-07-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.