NPI registry status
Active
2026 NPPES data Otolaryngology Physician NPI 1164424438 M.D.
Verify on CMS → Clifford Johnson,jr, M.D.
Otolaryngology Physician in Knoxville, 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 10,893 in Otolaryngology Physician, 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
49
Medicare Part D claims · 18 beneficiaries · Otolaryngology Physician avg: 509
What the federal data shows
Clifford Johnson,jr, M.D. filed 49 Medicare Part D claims in 2023 as an Otolaryngology Physician in Knoxville, Tennessee.
- 49
- Part D claims, 2023
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.
Clifford Johnson,jr, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
49 0th percentile higher than 0% of 1,370,886 prescribers
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.
Source CMS Medicare Part D Prescriber Public Use File · 2023
◑
Board-eligible specialty (heuristic, not verified)
Clifford Johnson,jr, M.D. practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Clifford Johnson,jr, M.D.?
Quality data not reportedPrimary specialty
Otolaryngology Physician
Medicare Part D claims
49 90% vs specialty avg
Specialty distribution in Tennessee
How Otolaryngology Physician 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 Otolaryngology Physician. 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).
Clifford Johnson,jr, M.D. appears in the CMS NPPES registry as an Otolaryngology Physician provider holding M.D. credentials at 9430 PARK WEST BLVD, Knoxville, TN, 37923, with a listed phone of (865) 693-6065. NPI 1164424438 was issued on 06/01/2005.
Medicare Part D records for calendar year 2023 show 49 prescription claims written by this provider, covering 18 Medicare beneficiaries and totaling roughly $2K in drug spend.
Otolaryngology Physician is a mid-sized specialty nationwide, with 10,893 enrolled providers across 54 states and an average of 509 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline.
Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist, always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.
Practice Address
Provider Details
| NPI | 1164424438 |
|---|---|
| Specialty | Otolaryngology Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 06/01/2005 |
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
49
Total Claims
$2K
Total Drug Cost
18
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 65
- Total Day Supply
- 1,594
- Generic Drug Cost
- $810
Patient Demographics
- Average Patient Age
- 74.7 years
- Avg HCC Risk Score
- 1.65
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
| Drug | Claims |
|---|---|
| NPPES-Specialty Hydroxychloroquine Sulfate | N/A |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Otolaryngology Physician Overview
How Clifford Johnson,jr, M.D. fits within the Otolaryngology Physician landscape nationally.
10,893
Otolaryngology Physician Providers in US
54
States with Otolaryngology Physician
509
Avg Claims per Provider
Clifford Johnson,jr, M.D.'s 49 claims are below the specialty average of 509.
Nearby Otolaryngology Physician Providers in Tennessee
Other clinicians with the same primary specialty enrolled in Tennessee, drawn from the same CMS NPPES roster as Johnson,jr.
Dr. Susan Abernathy
D.O.
Greeneville, TN
Dr. Bruce Abkes
MD
Johnson City, TN
Dr. Jeffrey Adams
MD
Morristown, TN
Dr. Robert Adham
MD
Maryville, TN
Dr. Khwaja Ahmed
M.D.
Jackson, TN
Compare Otolaryngology Physician nationally: see state-by-state distribution →
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the Tennessee medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Otolaryngology Physician peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
Healthcare Guides
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Medical Specialties Explained
Who treats what and how specialties differ
Understanding Medicare Claims Data
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How insurance networks affect your costs
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Explore Tennessee
Frequently Asked Questions
What is Clifford Johnson,jr, M.D.'s specialty? ▼
Clifford Johnson,jr, M.D. specializes in Otolaryngology Physician and practices in Knoxville, Tennessee. Credentials: M.D..
How much does Clifford Johnson,jr, M.D. prescribe under Medicare Part D? ▼
In 2023, Clifford Johnson,jr, M.D. wrote 49 Medicare Part D claims totaling $2K in drug costs for 18 beneficiaries.
Where is Clifford Johnson,jr, M.D. located? ▼
Clifford Johnson,jr, M.D. is located at 9430 PARK WEST BLVD, Knoxville, TN, 37923. Phone: (865) 693-6065.
What is Clifford Johnson,jr, M.D.'s NPI number? ▼
Clifford Johnson,jr, M.D.'s National Provider Identifier (NPI) is 1164424438, issued on 06/01/2005.
How many Otolaryngology Physician providers are there in the US? ▼
There are 10,893 Otolaryngology Physician providers across 54 states in the US. The average Otolaryngology Physician provider writes 509 Medicare Part D claims per year.
What drugs does Clifford Johnson,jr, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Clifford Johnson,jr, M.D.'s most frequently prescribed drugs include NPPES-Specialty. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Clifford Johnson,jr, M.D. accept Medicare? ▼
Clifford Johnson,jr, M.D. appears in CMS Medicare data with 49 Part D claims and 18 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Clifford Johnson,jr, M.D.'s credentials? ▼
Clifford Johnson,jr, M.D.'s NPI is 1164424438 with credentials M.D.. 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 (2023). 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 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.