NPI registry status
Active
2026 NPPES data Psychologist NPI 1548734460 PHD
Verify on CMS → Johnathan Duff, PHD
Psychologist in Falls Church, Virginia.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 48,221 in Psychologist, 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
Johnathan Duff, PHD is a Psychologist in Falls Church, Virginia, listed in the federal CMS National Provider Identifier registry.
- #51
- Psychologist rank among Virginia 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.
Federal trust snapshot
What official records show about Johnathan Duff, PHD
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 1548734460), first enumerated 01/14/2019.
Source: CMS NPPES
- Not in federal data
Medicare Part D participation
No 2023 Medicare Part D prescribing volume appears in the CMS public file for this NPI (may reflect specialty, new enrollment, or non-prescribing role).
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 1548734460 · Psychologist
NPI-10 · ENUM-RECENT · TAX-MID · RX-NONE · BOOK-LIGHT · PHOTO-ENUM
- NPI-10 1548734460
- ENUM-RECENT 2019
- TAX-MID 48K Psychologist
- RX-NONE No Part D
- BOOK-LIGHT 542 in Virginia
- PHOTO-ENUM Haleigh Winbourne · 2019
What does the federal data show about Johnathan Duff, PHD?
Quality data not reportedPrimary specialty
Psychologist
Specialty distribution in Virginia
How Psychologist compares to other specialties among Virginia 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 Psychologist. 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 | 1548734460 |
|---|---|
| Specialty | Psychologist |
| Credentials | PHD |
| Gender | Male |
| NPI Issued | 01/14/2019 |
Psychologist Overview
How Johnathan Duff, PHD fits within the Psychologist landscape nationally.
48,221
Psychologist Providers in US
56
States with Psychologist
741
Avg Claims per Provider
Nationwide Psychologist peers with similar MIPS or enrollment year
Two federal-record peer sets for Duff, both outside Virginia so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2019)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Psychologist Providers in Virginia
Other clinicians with the same primary specialty enrolled in Virginia, drawn from the same CMS NPPES roster as Duff.
One of 542 Psychologist providers enrolled in Virginia, 5 are shown here.
Dr. Heather Abbott
PSY.D.
Springfield, VA
McKenna Ackon
Richmond, VA
Amanda Adams
Falls Church, VA
Dr. Joyce Adkins
PHD, MHP
Falls Church, VA
Dr. Katherine Albach
PSYD
Virginia Beach, VA
Compare Psychologist nationally: see state-by-state distribution →
Frequently Asked Questions
What is Johnathan Duff, PHD's specialty? ▼
Johnathan Duff, PHD specializes in Psychologist and practices in Falls Church, Virginia. Credentials: PHD.
Where is Johnathan Duff, PHD located? ▼
Johnathan Duff, PHD is located at 5691 COLUMBIA PIKE STE 200, Falls Church, VA, 22041. Phone: (703) 998-5606.
What is Johnathan Duff, PHD's NPI number? ▼
Johnathan Duff, PHD's National Provider Identifier (NPI) is 1548734460, issued on 01/14/2019.
How many Psychologist providers are there in the US? ▼
There are 48,221 Psychologist providers across 56 states in the US. The average Psychologist provider writes 741 Medicare Part D claims per year.
Does Johnathan Duff, PHD accept Medicare? ▼
Johnathan Duff, PHD appears in CMS Medicare data. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Johnathan Duff, PHD's credentials? ▼
Johnathan Duff, PHD's NPI is 1548734460 with credentials PHD. 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 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.