NPI registry status
Active
2026 NPPES data Adult Health Nurse Practitioner NPI 1649235631 APN
Verify on CMS → Karen Johnston, APN
Adult Health Nurse Practitioner in Mountain Home, Tennessee.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 29,519 in Adult Health 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.
What the federal data shows
Karen Johnston, APN is an Adult Health Nurse Practitioner in Mountain Home, Tennessee, listed in the federal CMS National Provider Identifier registry.
- #51
- Adult Health Nurse Practitioner rank among Tennessee specialties
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.
CMS NPPES provider registry desk
NPI 1649235631 · Adult Health Nurse Practitioner
NPI-10 · ENUM-LEGACY · TAX-MID · RX-NONE · BOOK-THIN · PHOTO-ENUM
- NPI-10 1649235631
- ENUM-LEGACY 2006
- TAX-MID 30K Adult Health
- RX-NONE No Part D
- BOOK-THIN 496 in Tennessee
- PHOTO-ENUM Sharon Zache · 2006
What does the federal data show about Karen Johnston, APN?
Quality data not reportedPrimary specialty
Adult Health Nurse Practitioner
Specialty distribution in Tennessee
How Adult Health Nurse Practitioner compares to other specialties among Tennessee 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 Adult Health 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 | 1649235631 |
|---|---|
| Specialty | Adult Health Nurse Practitioner |
| Credentials | APN |
| Gender | Female |
| NPI Issued | 04/20/2006 |
Adult Health Nurse Practitioner Overview
How Karen Johnston, APN fits within the Adult Health Nurse Practitioner landscape nationally.
29,519
Adult Health Nurse Practitioner Providers in US
55
States with Adult Health Nurse Practitioner
1,201
Avg Claims per Provider
Nationwide Adult Health Nurse Practitioner peers with similar MIPS or enrollment year
Two federal-record peer sets for Johnston, both outside Tennessee so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2006)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Adult Health Nurse Practitioner Providers in Tennessee
Other clinicians with the same primary specialty enrolled in Tennessee, drawn from the same CMS NPPES roster as Johnston.
One of 496 Adult Health Nurse Practitioner providers enrolled in Tennessee, 5 are shown here.
Dr. Amber Adams
NP
Memphis, TN
Dr. Darryl Adams
APN
Altamont, TN
Dr. Joanna Adams
NP
Knoxville, TN
Dr. Wanda Adams
ANP
Murfreesboro, TN
Dr. Tania Addess
NP
Germantown, TN
Compare Adult Health Nurse Practitioner nationally: see state-by-state distribution →
Frequently Asked Questions
What is Karen Johnston, APN's specialty? ▼
Karen Johnston, APN specializes in Adult Health Nurse Practitioner and practices in Mountain Home, Tennessee. Credentials: APN.
Where is Karen Johnston, APN located? ▼
Karen Johnston, APN is located at CORNER OF SYDNEY AND LAMONT ST., Mountain Home, TN, 37684. Phone: (423) 926-1171.
What is Karen Johnston, APN's NPI number? ▼
Karen Johnston, APN's National Provider Identifier (NPI) is 1649235631, issued on 04/20/2006.
How many Adult Health Nurse Practitioner providers are there in the US? ▼
There are 29,519 Adult Health Nurse Practitioner providers across 55 states in the US. The average Adult Health Nurse Practitioner provider writes 1,201 Medicare Part D claims per year.
Does Karen Johnston, APN accept Medicare? ▼
Karen Johnston, APN appears in CMS Medicare data. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Karen Johnston, APN's credentials? ▼
Karen Johnston, APN's NPI is 1649235631 with credentials APN. 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.
- 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 April 2026 (NPPES) / 2023 (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 May 2026.