Sonja Halverson, LCSW
NPI 1740966555 · Clinical Social Worker · Spearfish, SD
Enrolled with Medicare as Practitioner - Clinical Social Worker · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Sonja Halverson, LCSW is a Clinical Social Worker provider in Spearfish, SD (NPI 1740966555).
Provider details
- NPI number
- 1740966555
- Entity type
- Individual
- Primary specialty
- Clinical Social WorkerBehavioral Health & Social Service Providers
- Credential
- LCSW
- Sex
- Female
- Sole proprietor
- No
- License
- 6391 (SD)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Behavioral Health & Social 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
- 2023-06-26
- Last updated
- 2024-03-14
- Certified
- 2024-03-14
Frequently asked questions
- What is Sonja Halverson's NPI number?
- Sonja Halverson's National Provider Identifier (NPI) is 1740966555, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Sonja Halverson's specialty?
- Sonja Halverson is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).
- Where is Sonja Halverson located?
- Sonja Halverson's practice location on file with NPPES is 115 N 7th St Ste 6, Spearfish, SD 57783-2710.
- What is Sonja Halverson's phone number?
- The practice phone number listed in the NPPES registry for Sonja Halverson is (605) 645-0100.
- Does Sonja Halverson accept Medicare?
- Sonja Halverson is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Sonja Halverson's NPI active?
- Yes — Sonja Halverson's NPI (1740966555) is active in the NPPES registry as of the last update on 2024-03-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.