MRS. KAREN JANET TERWILLIGER MS, APRN, AGPCNP-BC
NPI 1245616705
Nurse Practitioner - Gerontology in Mystic, CT

Active since August 07, 2015PECOS Enrolled

NPPES record last updated: June 2, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

About Mrs. Karen Janet Terwilliger Ms, Aprn, Agpcnp-bc NPPES

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

MRS. KAREN JANET TERWILLIGER MS, APRN, AGPCNP-BC (NPI 1245616705) is an individual gerontology provider in Mystic, Connecticut, licensed in Connecticut (6220) and active in the NPI registry since August 2015. She is enrolled in Medicare PECOS and maintains 2 additional practice locations.

NPPES Registry Identity

NPI1245616705
Entity TypeIndividualFemale
Primary Taxonomy363LG0600X
Provider Legal NameMRS. KAREN JANET TERWILLIGERCredential: MS, APRN, AGPCNP-BC
Location Address3 HERON RDMystic, CT 06355-3253
Mailing Address23 Old Voluntown RdGriswold, CT 06351-8828 · (401) 497-6799
Sole ProprietorNo
Enumeration DateAugust 7, 2015
Last NPPES UpdateJune 2, 2026
NPPES CertifiedJune 2, 2026
NPI 1245616705 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

Primary SpecialtyNurse Practitioner · GerontologyPhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code363LG0600X
License Licensed in CT · 6220
Also ListedNurse Practitioner · Primary CareTaxonomy 363LP2300X · License 6220 (CT)
3 HERON RD, Mystic, CT 06355

Secondary Practice Locations 2

Location 1112 Mansfield AveWillimantic, CT 06226-2045 · Phone (860) 456-6965
Location 2111 Salem TpkeNorwich, CT 06360-7403 · Phone (860) 425-8700

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

Enrolled in Medicare (PECOS)

Mrs. Karen Janet Terwilliger Ms, Aprn, Agpcnp-bc 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.

Areas of Expertise CMS Part B claims 9

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.

Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, 20 minutes or more 99308
A follow-up nursing facility visit per day is a daily check-up service provided by healthcare professionals. It lasts around 15 minutes and involves assessing your health status, monitoring your recovery progress, and addressing any concerns you may have about your health or treatment.
451 services89 patients
Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, at least 10 minutes 99307
A follow-up nursing facility visit per day typically lasts about 10 minutes. This service involves a healthcare professional checking on your health status, answering any questions you may have, and monitoring your progress. This routine check ensures your recovery is on track and any concerns are addressed promptly.
191 services60 patients
Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes 99309
A follow-up nursing facility visit per day is a daily check-in by a healthcare professional. This 25-minute visit typically involves monitoring your health progress, addressing any concerns, and adjusting treatment plans as necessary. It's a vital part of ensuring your ongoing wellbeing.
85 services25 patients
Residence visit for established patient with moderate level of medical decision making, per day, if using time, at least 40 minutes 99349
An established patient home visit is a medical appointment conducted at your home, typically lasting around 40 minutes. This service is ideal for patients who may find it difficult to travel to a healthcare facility. During this visit, a healthcare professional will evaluate your health status, manage your care, and answer any health-related questions you may have.
70 services31 patients
Removal of skin and tissue, 20.0 sq cm or less 11042
This procedure involves the surgical removal of skin and tissue, up to 20.0 square cm in size. It's often performed to treat conditions like skin cancer or to remove moles, warts, and other skin lesions. The area is numbed and the unwanted tissue is carefully cut out.
62 services18 patients
Residence visit for established patient with low level of medical decision making, per day, if using time, at least 30 minutes 99348
An established patient home visit is a 25-minute appointment where a healthcare provider visits you at your home. This service is for patients who have previously been seen by the provider. It includes a check-up and discussion about your health concerns.
53 services23 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 06355 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
$93.86 typical visit price
range $60.82 – $183.10
Typical copayment $23.46 (range $15.20 – $45.77)
Most-billed visit code 99203
Established Patient
$106.68 typical visit price
range $19.76 – $149.26
Typical copayment $26.67 (range $4.94 – $37.31)
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 7

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

Nurse Practitioner (Adult Health)
3 HERON RD
MYSTIC, CT 06355
Family Medicine
3 HERON RD
MYSTIC, CT 06355
Family Medicine (Geriatric Medicine)
3 HERON RD
MYSTIC, CT 06355
Nurse Practitioner (Gerontology)
3 HERON RD
MYSTIC, CT 06355
Family Medicine (Geriatric Medicine)
3 HERON RD
MYSTIC, CT 06355
Family Medicine
3 HERON RD
MYSTIC, CT 06355
Nurse Practitioner (Gerontology)
3 HERON RD
MYSTIC, CT 06355

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 Karen Terwilliger's NPI number?

The NPI number for Karen Terwilliger is 1245616705. It was assigned to this individual provider in the NPPES registry on August 7, 2015.

Where is Karen Terwilliger located?

Karen Terwilliger practices at 3 Heron Rd, Mystic, CT 06355. The listed phone number is (401) 497-6799.

What is Karen Terwilliger's specialty?

The primary specialty registered for this NPI is Nurse Practitioner, specializing in Gerontology, with taxonomy code 363LG0600X.

Is Karen Terwilliger enrolled in Medicare?

Yes. Karen Terwilliger is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Karen Terwilliger was last updated on June 2, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 months 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.