DR. WILLIAM ALLISON BARRET M.D. , M.S.
NPI 1891012696
Radiology - Vascular & Interventional Radiology in Nashville, TN

Q: What is William Barret's NPI number?

The NPI number for William Barret is 1891012696. It was assigned to this individual provider in the NPPES registry on May 3, 2010.

Q: What is William Barret's specialty?

The primary specialty registered for this NPI is Radiology, specializing in Vascular & Interventional Radiology, with taxonomy code 2085R0204X.

Q: When was this NPI record last updated?

The NPPES record for William Barret was last updated on May 8, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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 May 03, 2010PECOS EnrolledAccepts Medicare Assignment

97.12/100

CMS Quality Rating

3601 THE VANDERBILT CLINIC, NASHVILLE, TN 37232(615) 322-3000 Get Directions Write a Review

NPPES record last updated: May 8, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: May 8, 2026, Feb 15, 2023, Feb 9, 2023 and 4 more (7 updates tracked since 2016).

On this page

About Dr. William Allison Barret M.d. , M.s. NPPES

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

DR. WILLIAM ALLISON BARRET M.D. , M.S. (NPI 1891012696) is an individual vascular & interventional radiology provider in Nashville, Tennessee, licensed in Tennessee (54144) and active in the NPI registry since May 2010. He is enrolled in Medicare PECOS, is affiliated with Vanderbilt University Medical Center, and maintains 7 additional practice locations.

NPPES Registry Identity

NPI1891012696

Entity TypeIndividualMale

Primary Taxonomy2085R0204X

Provider Legal NameDR. WILLIAM ALLISON BARRETCredential: M.D. , M.S.

Location Address3601 THE VANDERBILT CLINICNashville, TN 37232-2637

Mailing Address3841 Green Hills Village Dr Ste 200Nashville, TN 37215-2691 · Fax (615) 322-5048

Phone(615) 322-3000

Sole ProprietorNo

Medical School CMSWake Forest University School Of MedicineGraduated 2010

Enumeration DateMay 3, 2010

Last NPPES UpdateMay 8, 20267 updates tracked since enumeration

NPPES CertifiedMay 8, 2026

✔ NPI 1891012696 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyRadiology · Vascular & Interventional RadiologyAllopathic & Osteopathic Physicians

Taxonomy Code2085R0204X

Licenses✔ Licensed in TN · 54144✔ Licensed in MI · 4301113903✔ Licensed in KY · 49096✔ Licensed in AZ · 64788✔ Licensed in AL · 31315✔ Licensed in CA · A153029

Definition

A radiologist who diagnoses and treats diseases by various radiologic imaging modalities. These include fluoroscopy, digital radiography, computed tomography, sonography and magnetic resonance imaging.

Also ListedRadiology · Diagnostic RadiologyTaxonomy 2085R0202X · License 54144 (TN), 31315 (AL)

3601 THE VANDERBILT CLINIC, Nashville, TN 37232

Open in Google Maps ↗

Secondary Practice Locations 7

Location 12009 Mallory Ln Ste 150Franklin, TN 37067-2872 · Phone (615) 771-8668

Location 2719 Thompson Ln Ste 23300Nashville, TN 37204-4686 · Phone (615) 936-3606

Location 31800 E Florence BlvdCasa Grande, AZ 85122-5303 · Phone (520) 381-6300

Location 41310 24th Ave SNashville, TN 37212-2637 · Phone (615) 327-4751 ext. 66032

Location 52002 Richard Jones Rd Ste B300Nashville, TN 37215-2809 · Phone (931) 685-2022

Location 6Department Of Radiology 1161 21st Ave SNashville, TN 37232-2637 · Phone (615) 322-5000

Location 74525 Harding Pike Ste 102Nashville, TN 37205-2145 · Phone (615) 463-3034

Other Identifiers 1

MedicaidQ022578TN

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Alliant Health Plans, Inc., CareSource, Cigna Healthcare and more.Insurance ›

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. William Allison Barret M.d. , M.s. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID2668618315

PECOS Enrollment IDI20160616001495, I20200203000742

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 William Barret reassigns Medicare billing to 14 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Vanderbilt University Medical Center

0.1 mi

Internal Medicine

1301 22ND AVE S
Nashville, TN 37232

Reassigned Medicare billing, Tennessee enrollment
4,711 clinicians in this Medicare group

NPI 1104202761 (615) 936-2000

Radiology Alliance PC

0.5 mi

Diagnostic Radiology

210 25TH AVE N STE 602
Nashville, TN 37203

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

NPI 1861478489 (615) 312-0600

Vanderbilt Imaging Services, LLC

0.8 mi

Diagnostic Radiology

1909 ACKLEN AVE
Nashville, TN 37212

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

NPI 1144241985 (615) 777-9729

One Hundred Oaks Imaging, LLC

3.5 mi

Diagnostic Radiology

719 THOMPSON LN, SUITE 23300
Nashville, TN 37204

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

NPI 1245485549 (615) 936-3606

Williamson Imaging, LLC

13 mi

Diagnostic Radiology

2009 MALLORY LN, SUITE 150
Franklin, TN 37067

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

NPI 1578581294 (615) 771-8668

Baptist Health Medical Group Inc

176 mi

Internal Medicine

1001 LEAWOOD DR
Frankfort, KY 40601

Reassigned Medicare billing, Kentucky enrollment
999 clinicians in this Medicare group

NPI 1629740774 (502) 223-0231

University Of Kentucky

180 mi

General Practice

2195 HARRODSBURG RD STE 175
Lexington, KY 40504

Reassigned Medicare billing, Kentucky enrollment
1,761 clinicians in this Medicare group

NPI 1194852582 (859) 257-9272

Edward W. Sparrow Hospital Association

470 mi

Pulmonary Disease

1200 E MICHIGAN AVE STE 700
Lansing, MI 48912

Reassigned Medicare billing, Michigan enrollment
117 clinicians in this Medicare group

NPI 1356088116 (517) 253-6320

Sonoran Radiology Ltd

1,435 mi

Vascular & Interventional Radiology

1400 S DOBSON RD
Mesa, AZ 85202

Reassigned Medicare billing, Arizona enrollment
447 clinicians in this Medicare group

NPI 1033745708 (623) 299-8743

Regents Of The University Of California

1,742 mi

Diagnostic Radiology

200 W ARBOR DR
San Diego, CA 92103

Reassigned Medicare billing, California enrollment
360 clinicians in this Medicare group

NPI 1417050956 (800) 926-8273

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 27

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.

X-ray of chest, 1 view 71045

A chest X-ray, 1 view, is a quick, painless test that produces images of the structures within your chest, such as your heart, lungs, and blood vessels. It helps in diagnosing conditions like pneumonia, heart problems, or lung cancer. You'll stand in front of a machine that emits X-rays, which pass through your body to create the image.

186 services175 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.

79 services78 patients

Use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes 99152

This procedure involves a doctor administering a medication to reduce your consciousness during a procedure. This helps in managing discomfort and anxiety. The initial application lasts for 15 minutes and is for individuals aged 5 years or older.

61 services61 patients

Ct scan of abdomen and pelvis with contrast 74177

A CT scan of the abdomen and pelvis with contrast is an imaging procedure. A special dye, called contrast, is used to make certain areas more visible. This can help identify issues such as infections, tumors, or other abnormalities. The procedure is painless and usually takes about 30 minutes.

40 services40 patients

Ct scan head or brain without contrast 70450

A CT scan of the head or brain without contrast is a non-invasive imaging procedure. It uses X-rays to create detailed pictures of your brain, skull, and other structures inside your head. It helps to detect conditions like strokes, tumors, or injuries. No dye (contrast) is used in this test.

39 services38 patients

Review by radiologist of ct guidance for needle placement 77012

This process involves a radiologist examining CT scan images to accurately guide a needle's placement within the body. This technique is often used for biopsies or treatments, ensuring precision and safety.

33 services33 patients

X-ray of hip, 2-3 views 73502

An X-ray of the hip with 2-3 views is a non-invasive imaging test. It uses a small amount of radiation to produce pictures of the hip joint. These images help in diagnosing conditions like fractures, arthritis, or other abnormalities. The process is quick and painless.

32 services30 patients

Ct scan of abdomen and pelvis without contrast 74176

A CT scan of the abdomen and pelvis is a non-invasive medical test. It uses special X-ray equipment to create detailed images of your abdominal and pelvic areas. This helps doctors examine organs, tissues, and vessels. No contrast dye is used in this procedure.

31 services30 patients

Ct scan of blood vessels of chest with contrast 71275

A CT scan of the chest with contrast is a non-invasive imaging test. It uses X-rays and a special dye to get detailed images of your blood vessels in the chest. This helps in diagnosing conditions related to heart and lungs.

25 services25 patients

Ct scan of chest without contrast 71250

A CT scan of the chest without contrast is a non-invasive imaging procedure. It uses special X-ray equipment to produce detailed images of your chest area, including your lungs and heart. It can help diagnose conditions such as lung diseases or heart disorders. It doesn't involve any dyes or contrast agents.

22 services22 patients

Ultrasonic guidance for needle placement 76942

Ultrasonic guidance for needle placement is a technique where sound waves create images that help accurately position the needle during procedures. This method ensures precision, minimizes discomfort, and increases safety.

21 services21 patients

Needle biopsy of liver through skin 47000

A needle biopsy of the liver through skin is a procedure where a small tissue sample from your liver is collected using a thin needle. This is done to diagnose liver diseases or conditions. It involves inserting the needle through your skin and into your liver.

20 services20 patients

Ct scan of chest with contrast 71260

A CT scan of the chest with contrast is an imaging procedure. A special dye (contrast) is used to highlight specific areas in your body, providing clearer pictures of your chest. This helps in diagnosing conditions related to your lungs, heart, and other chest structures.

20 services20 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.

19 services19 patients

X-ray of foot, minimum of 3 views 73630

An X-ray of the foot, minimum of 3 views, is a non-invasive imaging test. It uses a small amount of radiation to produce images of the bones and tissues in your foot. This helps to identify fractures, infections, or other abnormalities. Multiple views ensure a comprehensive examination.

17 services17 patients

X-ray of knee, 3 views 73562

An X-ray of the knee, 3 views, is a non-invasive imaging test. It uses a small amount of radiation to produce images of the knee from three different angles. This helps medical professionals to diagnose and monitor conditions like arthritis, fractures, or infections. The process is quick and painless.

16 services15 patients

Mri scan of brain without contrast 70551

An MRI scan of the brain without contrast is a non-invasive imaging test. It uses a magnetic field and radio waves to create detailed images of your brain. It helps in detecting abnormalities like tumors, stroke, inflammation, or infection.

15 services15 patients

X-ray of abdomen, 1 view 74018

An X-ray of the abdomen, 1 view, is a quick and painless imaging test. It uses a small amount of radiation to produce images of the structures in your abdomen, such as the stomach, liver, and intestines. This can help identify issues like blockages, infections, or injuries.

15 services15 patients

Limited ultrasound scan of abdomen 76705

A limited ultrasound scan of the abdomen is a non-invasive imaging test. It uses sound waves to produce images of the abdominal organs such as the liver, gallbladder, spleen, pancreas, and kidneys. This helps to identify any abnormalities or issues.

15 services14 patients

Fluoroscopic guidance for insertion or removal of central vein access device 77001

Fluoroscopic guidance for central vein access device insertion or removal is a procedure where a special X-ray, called a fluoroscope, is used to help accurately place or remove a device in a central vein. This device aids in delivering medications or collecting blood samples.

15 services15 patients

X-ray of wrist, minimum of 3 views 73110

An X-ray of the wrist, minimum of 3 views, is a diagnostic procedure that uses radiation to create images of your wrist from different angles. This helps detect fractures, infections, or other abnormalities for accurate diagnosis and treatment planning.

14 services14 patients

X-ray of lower and sacral spine, 2-3 views 72100

An X-ray of the lower and sacral spine involves capturing images of your lower back area, including the tailbone. This procedure helps in identifying problems like fractures, infections, or deformities. 2-3 different angle views provide a comprehensive picture.

13 services13 patients

Ct scan of upper spine without contrast 72125

A CT scan of the upper spine without contrast is a non-invasive imaging test that uses X-rays to capture detailed images of your neck and upper back. It helps in identifying issues like fractures, tumors, or infections. No dye (contrast) is used in this scan.

13 services13 patients

Ultrasonic guidance for blood vessel access 76937

Ultrasonic guidance for blood vessel access is a medical procedure where sound waves are used to create images of your blood vessels. This helps doctors to accurately locate and access the vessels for treatments or tests, ensuring safety and precision.

13 services13 patients

Insertion of central venous tube with port (5 years or older) 36561

A central venous tube with port is a small, flexible tube inserted into a large vein, usually in the chest. It allows for easy administration of medication, fluids, or blood products over a long period. A port is attached under the skin for easy access. It's safe for individuals aged 5 and above.

12 services12 patients

Ultrasound study of arm or leg veins with compression and maneuvers 93970

An ultrasound study of arm or leg veins with compression and maneuvers is a non-invasive procedure that uses sound waves to create images of your veins. This helps identify blood clots or other vein problems. During the procedure, pressure is applied to the veins and certain movements are performed to assess blood flow.

12 services12 patients

Complete ultrasound scan behind abdominal cavity 76770

A complete ultrasound scan behind the abdominal cavity is a non-invasive imaging procedure. It uses sound waves to create pictures of the structures and organs located at the back of your abdomen. It helps in diagnosing health conditions and monitoring ongoing treatments.

11 services11 patients

Hospital Affiliations CMS Care Compare 4

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Vanderbilt University Medical Center

Acute Care Hospitals · Nashville, TN

4/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number440039

Location1211 Medical Center DriveNashville, TN 37232 · Davidson County

Emergency services Birthing friendly

Vanderbilt Bedford Hospital

Acute Care Hospitals · Shelbyville, TN

4/5 CMS rating

OwnershipProprietary

CMS Certification Number440137

Location2835 Hwy 231 NorthShelbyville, TN 37160 · Bedford County

Emergency services

Vanderbilt Tullahoma-Harton Hospital

Acute Care Hospitals · Tullahoma, TN

3/5 CMS rating

OwnershipVoluntary non-profit - Other

CMS Certification Number440144

Location1801 N Jackson St Box 460Tullahoma, TN 37388 · Coffee County

Emergency services Birthing friendly

Vanderbilt Wilson County Hospital

Acute Care Hospitals · Lebanon, TN

3/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number440193

Location1411 Baddour ParkwayLebanon, TN 37087 · Wilson County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 37232 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$81.53 typical visit price

range $52.64 – $160.89

Typical copayment $20.38 (range $13.16 – $40.22)

Most-billed visit code 99203

Established Patient

$66.01 typical visit price

range $16.72 – $131.41

Typical copayment $16.50 (range $4.18 – $32.85)

Most-billed visit code 99213

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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.

97.12/100

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

Scored through an Alternative Payment Model

Quality

85.64

Promoting Interoperability

100

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.

DR. ENGLISH FLACK MD

Pediatrics (Pediatric Cardiology)