NPI registry status
Active
2026 NPPES data Gerontology Nurse Practitioner NPI 1245616705 MS, APRN, AGPCNP-BC
Verify on CMS → Karen Terwilliger, MS, APRN, AGPCNP-BC
Gerontology Nurse Practitioner in Mystic, Connecticut.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 10,056 in Gerontology Nurse Practitioner, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
56
Medicare Part D claims · 20 beneficiaries · Gerontology Nurse Practitioner avg: 1K
What the federal data shows
Karen Terwilliger, MS, APRN, AGPCNP-BC filed 56 Medicare Part D claims in 2024 as a Gerontology Nurse Practitioner in Mystic, Connecticut.
- 56
- Part D claims, 2024
- ≥0th
- pct by Part D claim volume (lower-bound band)
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
Federal trust snapshot
What official records show about Karen Terwilliger, MS, APRN, AGPCNP-BC
Bare NPI registry listing — limited federal enrichment beyond basic enumeration. Verify all credentials with official sources.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1245616705), first enumerated 08/07/2015.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 56 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1245616705 · Gerontology Nurse Practitioner
NPI-10 · ENUM-MID · TAX-MID · RX-TRACE · BOOK-THIN · PHOTO-ENUM
- NPI-10 1245616705
- ENUM-MID 2015
- TAX-MID 10K Gerontology Nurse
- RX-TRACE 56
- BOOK-THIN 146 in Connecticut
- PHOTO-ENUM Anne Bannister, AGNP · 2015
Karen Terwilliger, MS, APRN, AGPCNP-BC's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
56 ≥ 0th percentile 0% of 1,416,883 prescribers are in lower value bands
Each bar is a band; taller bars hold more prescribers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2024
What does the federal data show about Karen Terwilliger, MS, APRN, AGPCNP-BC?
Quality data not reportedPrimary specialty
Gerontology Nurse Practitioner
Medicare Part D claims
56 96% vs specialty avg
Specialty distribution in Connecticut
How Gerontology Nurse Practitioner compares to other specialties among Connecticut providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Gerontology Nurse Practitioner. Verify directly:
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Practice Address
Provider Details
| NPI | 1245616705 |
|---|---|
| Specialty | Gerontology Nurse Practitioner |
| Credentials | MS, APRN, AGPCNP-BC |
| Gender | Female |
| NPI Issued | 08/07/2015 |
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2024.
56
Total Claims
$7K
Total Drug Cost
20
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 58
- Total Day Supply
- 1,269
- Generic Drug Cost
- $1K
Patient Demographics
- Average Patient Age
- 78.3 years
- Avg HCC Risk Score
- 2.90
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
| Drug | Claims |
|---|---|
| Santyl Collagenase Clostridium Hist. | 11 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Gerontology Nurse Practitioner Overview
How Karen Terwilliger, MS, APRN, AGPCNP-BC fits within the Gerontology Nurse Practitioner landscape nationally.
10,056
Gerontology Nurse Practitioner Providers in US
54
States with Gerontology Nurse Practitioner
1,350
Avg Claims per Provider
Karen Terwilliger, MS, APRN, AGPCNP-BC's 56 claims are below the specialty average of 1,350.
Nationwide Gerontology Nurse Practitioner peers with similar MIPS or enrollment year
Two federal-record peer sets for Terwilliger, both outside Connecticut so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2015)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Gerontology Nurse Practitioner Providers in Connecticut
Other clinicians with the same primary specialty enrolled in Connecticut, drawn from the same CMS NPPES roster as Terwilliger.
One of 146 Gerontology Nurse Practitioner providers enrolled in Connecticut, 5 are shown here.
Linda Accordino
RN, MSN
West Haven, CT
Celina Adams
APRN
Uncasville, CT
Susan Ade
APRN, RN
Shelton, CT
Lawrence Anderson
AGNP-C
Waterbury, CT
Terance Anderson
APRN
New Haven, CT
Compare Gerontology Nurse Practitioner nationally: see state-by-state distribution →
Frequently Asked Questions
What is Karen Terwilliger, MS, APRN, AGPCNP-BC's specialty? ▼
Karen Terwilliger, MS, APRN, AGPCNP-BC specializes in Gerontology Nurse Practitioner and practices in Mystic, Connecticut. Credentials: MS, APRN, AGPCNP-BC.
How much does Karen Terwilliger, MS, APRN, AGPCNP-BC prescribe under Medicare Part D? ▼
In 2024, Karen Terwilliger, MS, APRN, AGPCNP-BC wrote 56 Medicare Part D claims totaling $7K in drug costs for 20 beneficiaries.
Where is Karen Terwilliger, MS, APRN, AGPCNP-BC located? ▼
Karen Terwilliger, MS, APRN, AGPCNP-BC is located at 3 HERON RD, Mystic, CT, 06355. Phone: (401) 497-6799.
What is Karen Terwilliger, MS, APRN, AGPCNP-BC's NPI number? ▼
Karen Terwilliger, MS, APRN, AGPCNP-BC's National Provider Identifier (NPI) is 1245616705, issued on 08/07/2015.
How many Gerontology Nurse Practitioner providers are there in the US? ▼
There are 10,056 Gerontology Nurse Practitioner providers across 54 states in the US. The average Gerontology Nurse Practitioner provider writes 1,350 Medicare Part D claims per year.
What drugs does Karen Terwilliger, MS, APRN, AGPCNP-BC prescribe most often? ▼
Based on 2024 Medicare Part D data, Karen Terwilliger, MS, APRN, AGPCNP-BC's most frequently prescribed drugs include Santyl. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Karen Terwilliger, MS, APRN, AGPCNP-BC accept Medicare? ▼
Karen Terwilliger, MS, APRN, AGPCNP-BC appears in CMS Medicare data with 56 Part D claims and 20 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Karen Terwilliger, MS, APRN, AGPCNP-BC's credentials? ▼
Karen Terwilliger, MS, APRN, AGPCNP-BC's NPI is 1245616705 with credentials MS, APRN, AGPCNP-BC. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2024). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of August 2026 (NPPES) / 2024 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of August 2026.