John Simmons, M.D.
NPI 1881691228 · Diagnostic Radiology Physician · Knoxville, TN
Enrolled with Medicare as Practitioner - Diagnostic Radiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Simmons, M.D. is a Diagnostic Radiology Physician provider in Knoxville, TN (NPI 1881691228).
Provider details
- NPI number
- 1881691228
- Entity type
- Individual
- Primary specialty
- Diagnostic Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 14768 (TN)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
20 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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 methodology.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$27 across 1 record (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
- 2005-06-30
- Last updated
- 2022-10-21
- Certified
- 2022-10-21
Frequently asked questions
- What is John Simmons's NPI number?
- John Simmons's National Provider Identifier (NPI) is 1881691228, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Simmons's specialty?
- John Simmons is listed in the NPPES registry with a primary specialty of Diagnostic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is John Simmons located?
- John Simmons's practice location on file with NPPES is 1112 E Weisgarber Rd Ste 102, Knoxville, TN 37909-2647.
- What is John Simmons's phone number?
- The practice phone number listed in the NPPES registry for John Simmons is (865) 558-9862.
- Does John Simmons accept Medicare?
- John Simmons is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Simmons's NPI active?
- Yes — John Simmons's NPI (1881691228) is active in the NPPES registry as of the last update on 2022-10-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.