JOHN P WILLIAMS MD
NPI 1659341832
Radiology - Pediatric Radiology in Knoxville, TN

Q: What is John Williams's NPI number?

The NPI number for John Williams is 1659341832. It was assigned to this individual provider in the NPPES registry on January 23, 2006.

Q: What is John Williams's specialty?

The primary specialty registered for this NPI is Radiology, specializing in Pediatric Radiology, with taxonomy code 2085P0229X.

Q: When was this NPI record last updated?

The NPPES record for John Williams was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since January 23, 2006PECOS Enrolled

98.98/100

CMS Quality Rating

2001 LAUREL AVE, SUITE N304, KNOXVILLE, TN 37916(865) 546-9484 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

On this page

About John P Williams Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

JOHN P WILLIAMS MD (NPI 1659341832) is an individual pediatric radiology provider in Knoxville, Tennessee, licensed in Tennessee (MD28001) and active in the NPI registry since January 2006. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1659341832

Entity TypeIndividualMale

Primary Taxonomy2085P0229X

Provider Legal NameJOHN P WILLIAMSCredential: MD

Location Address2001 LAUREL AVE, SUITE N304Knoxville, TN 37916-1810

Mailing Address2001 Laurel Ave, Suite N304Knoxville, TN 37916-1810 · (865) 546-9484

Phone(865) 546-9484

Sole ProprietorNo

Enumeration DateJanuary 23, 2006

Last NPPES UpdateJuly 13, 2026

✔ NPI 1659341832 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyRadiology · Pediatric RadiologyAllopathic & Osteopathic Physicians

Taxonomy Code2085P0229X

License✔ Licensed in TN · MD28001

Definition

A radiologist who is proficient in all forms of diagnostic imaging as it pertains to the treatment of diseases in the newborn, infant, child and adolescent. This specialist has knowledge of both imaging and interventional procedures related to the care and management of diseases of children. A pediatric radiologist must be highly knowledgeable of all organ systems as they relate to growth and development, congenital malformations, diseases peculiar to infants and children and diseases that begin in childhood but cause substantial residual impairment in adulthood.

2001 LAUREL AVE, Knoxville, TN 37916

Open in Google Maps ↗

Other Identifiers 1

Medicaid3372353TN

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

John P Williams Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

Medicare enrollment records show John Williams reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Vista Radiology, PC.

Same address

Diagnostic Radiology

2001 LAUREL AVE STE N304
Knoxville, TN 37916

Reassigned Medicare billing, Tennessee enrollment
63 clinicians in this Medicare group

NPI 1386698710 (865) 595-4100

Covenant Health Diagnostic Centers, LLC

6.9 mi

Physiological Laboratory

7625 CHAPMAN HWY STE 105
Knoxville, TN 37920

Reassigned Medicare billing, Tennessee enrollment
Also billed through NPI 1255950895 (Tennessee)
17 clinicians in this Medicare group

NPI 1437886918 (865) 531-5408

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 10

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Screening 3d breast mammography 77063

Screening 3D breast mammography is a procedure that uses low-dose X-rays to create detailed images of the breast. This allows for early detection of any unusual changes or growths. It's a non-invasive, outpatient procedure that typically takes about 30 minutes.

135 services135 patients

Screening mammography 77067

Screening mammography is a preventative measure that uses low-dose X-rays to take images of the chest area. It's a key tool in early detection of abnormalities, helping to identify issues before they become symptomatic. It is recommended annually for certain age groups.

134 services134 patients

X-ray of chest, 2 views 71046

A chest X-ray, 2 views, is a quick, painless test that creates pictures of the structures inside your chest, such as your heart, lungs, and blood vessels. Two different angles are used to get a comprehensive view. This helps in diagnosing conditions like pneumonia, heart problems, or lung cancer.

55 services54 patients

Dxa bone density measurement of hip, pelvis, spine 77080

A DXA bone density measurement is a simple, quick, and non-invasive procedure that assesses the strength of your bones. This test uses X-rays to measure the amount of minerals, mainly calcium, in the hip, pelvis, and spine. It helps in early detection of osteoporosis or other bone diseases.

35 services35 patients

Ultrasound study of one arm or leg veins with compression and maneuvers 93971

This is a non-invasive procedure using sound waves to visualize veins in an arm or leg. It involves applying gentle pressure and performing certain movements. It helps identify any abnormal blood flow or clots, ensuring vascular health.

18 services17 patients

Limited ultrasound scan of 1 breast 76642

A limited ultrasound scan of one breast is a non-invasive imaging test. It uses sound waves to create pictures of the inside of your breast. It helps identify any unusual growths or changes. It's safe, quick, and typically painless.

16 services16 patients

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

98.98/100

MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program

Scored as part of a group practice

Quality

98.8

Improvement Activities

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

SCOTT A WEGRYN MD

Radiology (Vascular & Interventional Radiology)

2001 LAUREL AVE, SUITE N304
KNOXVILLE, TN 37916

Knox County (865) 546-9484

SAMUEL H FEASTER MD

Radiology (Neuroradiology)

2001 LAUREL AVE, SUITE N304
KNOXVILLE, TN 37916

Knox County (865) 546-9484

DR. SUNG YONG BAE M.D.

Internal Medicine

2001 LAUREL AVE, SUITE 206
KNOXVILLE, TN 37916

Knox County (865) 524-3131

DR. VIJAY R. PATIL M.D.

Thoracic Surgery (Cardiothoracic Vascular Surgery)

2001 LAUREL AVE, SUITE 201
KNOXVILLE, TN 37916

Knox County (865) 522-3355

DR. WILLIAM L. JOHNSON MD

Orthopaedic Surgery

2001 LAUREL AVE, SUITE 402 NEWLAND PROFESSIONAL BLDG.
KNOXVILLE, TN 37916

Knox County (865) 632-5577

EAST TENNESSEE NEPHROLOGY PC

Internal Medicine (Nephrology)

2001 LAUREL AVE, STE 206
KNOXVILLE, TN 37916

Knox County (865) 524-3131

HEJUNG KIM MD

Radiology (Nuclear Radiology)

2001 LAUREL AVE, SUITE N304
KNOXVILLE, TN 37916

Knox County (865) 766-6870

MAUREEN THERESA CADMUS MSN APN RN

Nurse Practitioner

2001 LAUREL AVE, STE 204
KNOXVILLE, TN 37916

Knox County (865) 673-0288

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is John Williams's NPI number?

The NPI number for John Williams is 1659341832. It was assigned to this individual provider in the NPPES registry on January 23, 2006.

Where is John Williams located?

John Williams practices at 2001 Laurel Ave Suite N304, Knoxville, TN 37916. The listed phone number is (865) 546-9484.

What is John Williams's specialty?

The primary specialty registered for this NPI is Radiology, specializing in Pediatric Radiology, with taxonomy code 2085P0229X.

Is John Williams enrolled in Medicare?

Yes. John Williams is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for John Williams's services?

According to the CMS Revalidation Reassignment List (October 2026 release), John Williams reassigns Medicare benefits to 2 organizations: Vista Radiology, PC. (Knoxville, TN) and Covenant Health Diagnostic Centers, LLC (Knoxville, TN). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for John Williams's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for John Williams was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.