THERESA E. HAMMERQUIST MSN, APRN, NP-C, CNP
NPI 1982194049
Nurse Practitioner - Primary Care in Martin, SD

Q: What is Theresa Hammerquist's NPI number?

The NPI number for Theresa Hammerquist is 1982194049. It was assigned to this individual provider in the NPPES registry on May 15, 2018. The provider is also known as Theresa E. Van Asma.

Q: What is Theresa Hammerquist's specialty?

The primary specialty registered for this NPI is Nurse Practitioner, specializing in Primary Care, with taxonomy code 363LP2300X.

Active since May 15, 2018PECOS Enrolled

109 PUGH ST, MARTIN, SD 57551(605) 685-6868 Get Directions Write a Review

NPPES record last updated: May 15, 2018. Verified against the NPPES registry weekly; last sync: October 25, 2026.

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About Theresa E. Hammerquist Msn, Aprn, Np-c, Cnp NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

THERESA E. HAMMERQUIST MSN, APRN, NP-C, CNP (NPI 1982194049) is an individual primary care provider in Martin, South Dakota, licensed in South Dakota (CP001376) and active in the NPI registry since May 2018. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1982194049

Entity TypeIndividualFemale

Primary Taxonomy363LP2300X

Provider Legal NameTHERESA E. HAMMERQUISTCredential: MSN, APRN, NP-C, CNP

Location Address109 PUGH STMartin, SD 57551-7700

Mailing Address11515 Nemo RdRapid City, SD 57702-6182 · (605) 430-0304

Phone(605) 685-6868

Sole ProprietorNo

Enumeration DateMay 15, 2018

✔ NPI 1982194049 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyNurse Practitioner · Primary CarePhysician Assistants & Advanced Practice Nursing Providers

Taxonomy Code363LP2300X

License✔ Licensed in SD · CP001376

109 PUGH ST, Martin, SD 57551

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Other Names 1

Former Name (1)Theresa E. Van Asma

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Wellmark of South Dakota, Inc..Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Theresa E. Hammerquist Msn, Aprn, Np-c, Cnp is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

Medicare enrollment records show Theresa Hammerquist reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Horizon Health Care Inc.

Same address

Federally Qualified Health Center (FQHC)

109 PUGH ST
Martin, SD 57551

Reassigned Medicare billing, South Dakota enrollment
67 clinicians in this Medicare group

NPI 1316054935 (605) 685-6868

Avera Mckennan

95 mi

Rural Health

660 W 2ND ST
Winner, SD 57580

Reassigned Medicare billing, South Dakota enrollment
1,277 clinicians in this Medicare group

NPI 1912959495 (605) 842-2443

Avera St Marys

107 mi

Emergency Medicine

801 E SIOUX AVE
Pierre, SD 57501

Reassigned Medicare billing, South Dakota enrollment
197 clinicians in this Medicare group

NPI 1073305496 (605) 224-3100

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 2

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Emergency department visit with high level of medical decision making 99285

An emergency department visit for severe conditions is when you urgently seek medical help due to serious health issues. These could be severe injuries, breathing problems, unbearable pain, or sudden severe illness. Doctors and nurses will provide immediate care to stabilize your condition.

25 services25 patients

Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only 93010

A routine electrocardiogram (ECG) with 12 leads is a simple, non-invasive test that records the electrical activity of your heart. It helps in identifying heart conditions by detecting irregularities in your heart rhythms. The results are interpreted and a report is provided.

12 services12 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 57551 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$85.21 typical visit price

range $55.52 – $167.23

Typical copayment $21.30 (range $13.88 – $41.80)

Most-billed visit code 99203

Established Patient

$97.88 typical visit price

range $18.08 – $137.08

Typical copayment $24.47 (range $4.52 – $34.27)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 3

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

MS. CYNTHIA ELAINE BOLTZ

Nurse Practitioner (Family)

109 PUGH ST
MARTIN, SD 57551

Bennett County (605) 685-6868

HORIZON HEALTH CARE INC.

Clinic/Center (Federally Qualified Health Center (FQHC))

109 PUGH ST
MARTIN, SD 57551

Bennett County (605) 685-6868

COURTNEY LAJUAN CARMICHAEL PA-C

Physician Assistant

109 PUGH ST
MARTIN, SD 57551

Bennett County (605) 685-6868

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Theresa Hammerquist's NPI number?

The NPI number for Theresa Hammerquist is 1982194049. It was assigned to this individual provider in the NPPES registry on May 15, 2018. The provider is also known as Theresa E. Van Asma.

Where is Theresa Hammerquist located?

Theresa Hammerquist practices at 109 Pugh St, Martin, SD 57551. The listed phone number is (605) 685-6868.

What is Theresa Hammerquist's specialty?

The primary specialty registered for this NPI is Nurse Practitioner, specializing in Primary Care, with taxonomy code 363LP2300X.

Is Theresa Hammerquist enrolled in Medicare?

Yes. Theresa Hammerquist is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Theresa Hammerquist's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Theresa Hammerquist reassigns Medicare benefits to 3 organizations: Horizon Health Care Inc. (Martin, SD), Avera Mckennan (Winner, SD) and Avera St Marys (Pierre, SD). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Theresa Hammerquist's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Theresa Hammerquist accept?

Health plans from Wellmark of South Dakota, Inc. list Theresa Hammerquist as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Theresa Hammerquist was last updated on May 15, 2018. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.