Kenneth Johnsen, MD
NPI 1851650865 · Rheumatology Physician · Knoxville, TN
Enrolled with Medicare as Practitioner - Rheumatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Kenneth Johnsen, MD is a Rheumatology Physician provider in Knoxville, TN (NPI 1851650865).
Provider details
- NPI number
- 1851650865
- Entity type
- Individual
- Primary specialty
- Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 51150 (TN)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
14 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
4,162 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Complete Blood Cell Count (red Cells, White Blood Cell, Platelets), Automated Test and Automated Differential White Blood Cell Count85025 | 675 | $7 |
| Administration of Chemotherapy Into Vein, 1 Hour Or Less96413 | 650 | $113 |
| Red Blood Cell Sedimentation Rate, to Detect Inflammation, Non-Automated85651 | 588 | $4 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 549 | $116 |
| Administration of Non-Hormonal Anti-Neoplastic Chemotherapy Under Skin Or Into Muscle96401 | 509 | $63 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 440 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 23 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Methotrexate Sodiumbrand: Methotrexate | 532 | 171 |
| Hydroxychloroquine Sulfate | 297 | 91 |
| Sulfasalazine | 163 | 58 |
| Prednisone | 136 | 53 |
| Leflunomide | 132 | 36 |
| Folic Acid | 113 | 37 |
| Gabapentin | 107 | 38 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$2,513 across 147 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2012-05-10
- Last updated
- 2020-03-18
- Certified
- 2020-03-18
Frequently asked questions
- What is Kenneth Johnsen's NPI number?
- Kenneth Johnsen's National Provider Identifier (NPI) is 1851650865, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Kenneth Johnsen's specialty?
- Kenneth Johnsen is listed in the NPPES registry with a primary specialty of Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is Kenneth Johnsen located?
- Kenneth Johnsen's practice location on file with NPPES is 4707 Papermill Dr Ste 200, Knoxville, TN 37909-1907.
- What is Kenneth Johnsen's phone number?
- The practice phone number listed in the NPPES registry for Kenneth Johnsen is (865) 602-7983.
- Does Kenneth Johnsen accept Medicare?
- Kenneth Johnsen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Kenneth Johnsen's NPI active?
- Yes — Kenneth Johnsen's NPI (1851650865) is active in the NPPES registry as of the last update on 2020-03-18.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.