Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DR. WILLIAM F ALEXANDER M.D.
NPI 1609848738
Internal Medicine - Gastroenterology in Nashville, TN

Q: What is William Alexander's NPI number?

The NPI number for William Alexander is 1609848738. It was assigned to this individual provider in the NPPES registry on February 2, 2006.

Q: What is William Alexander's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Q: When was this NPI record last updated?

The NPPES record for William Alexander was last updated on October 1, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 20 days 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 February 02, 2006PECOS EnrolledAccepts Medicare Assignment

1916 PATTERSON ST STE 203, NASHVILLE, TN 37203(615) 327-7835(615) 321-4146 Get Directions Write a Review

NPPES record last updated: October 1, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Oct 1, 2026, Apr 12, 2021, May 10, 2017 (3 updates tracked since 2017).

On this page

About Dr. William F Alexander M.d. NPPES

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

DR. WILLIAM F ALEXANDER M.D. (NPI 1609848738) is an individual gastroenterology provider in Nashville, Tennessee, licensed in Tennessee (MD0000018809) and active in the NPI registry since February 2006. He is enrolled in Medicare PECOS, is affiliated with Ascension Saint Thomas Hospital, and maintains 2 additional practice locations.

NPPES Registry Identity

NPI1609848738

Entity TypeIndividualMale

Primary Taxonomy207RG0100X

Provider Legal NameDR. WILLIAM F ALEXANDERCredential: M.D.

Location Address1916 PATTERSON ST STE 203Nashville, TN 37203-2191

Mailing Address3024 Business Park CirGoodlettsville, TN 37072-3132 · (615) 851-6033 · Fax (615) 851-2018

Phone(615) 327-7835

Fax(615) 321-4146

Sole ProprietorNo

Medical School CMSUniversity Of North Carolina At Chapel Hill School Of MedicineGraduated 1983

Enumeration DateFebruary 2, 2006

Last NPPES UpdateOctober 1, 20263 updates tracked since enumeration

NPPES CertifiedOctober 1, 2026

✔ NPI 1609848738 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · GastroenterologyAllopathic & Osteopathic Physicians

Taxonomy Code207RG0100X

License✔ Licensed in TN · MD0000018809

Definition

An internist who specializes in diagnosis and treatment of diseases of the digestive organs including the stomach, bowels, liver and gallbladder. This specialist treats conditions such as abdominal pain, ulcers, diarrhea, cancer and jaundice and performs complex diagnostic and therapeutic procedures using endoscopes to visualize internal organs.

1916 PATTERSON ST STE 203, Nashville, TN 37203

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Secondary Practice Locations 2

Location 1315 Oak StLivingston, TN 38570-1728 · Phone (615) 327-7835 · Fax (615) 321-4146

Location 21559 Sparta St Ste 303McMinnville, TN 37110-1316 · Phone (615) 327-7835 · Fax (615) 321-4146

Other Identifiers 4

Medicaid3034431TN

Other6034412TN · Bcbs Tn

Medicaid3034434TN

Medicaid64913668KY

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Arkansas Health & Wellness, Ambetter Health, Ambetter of Alabama 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 F Alexander M.d. 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 ID1557432705

PECOS Enrollment IDI20080617000194

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 Alexander reassigns Medicare billing to 6 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Saint Thomas Medical Partners

0.1 mi

Internal Medicine

2011 MURPHY AVE, SUITE 301
Nashville, TN 37203

Reassigned Medicare billing, Tennessee enrollment
1,304 clinicians in this Medicare group

NPI 1437194669 (615) 327-9543

Advanced Diagnostic Imaging, PC

13 mi

Internal Medicine

3024 BUSINESS PARK CIR
Goodlettsville, TN 37072

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

NPI 1093741464 (615) 239-2061

Advanced Specialists, PC

13 mi

Internal Medicine

3024 BUSINESS PARK CIR
Goodlettsville, TN 37072

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

NPI 1649133463 (615) 239-2018

Sumner Physician Practices LLC

16 mi

Gastroenterology

105 GLEN OAK BLVD, SUITE 200
Hendersonville, TN 37075

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

NPI 1124438601 (615) 822-6716

Cookeville Regional Medical Group, Inc

72 mi

Multi-Specialty

140 W 7TH ST
Cookeville, TN 38501

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

NPI 1649202102 (931) 783-5582

Ut Regional One Physicians Inc

195 mi

Surgery

877 JEFFERSON AVE
Memphis, TN 38103

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

NPI 1093130585 (901) 545-8336

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 14

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.

Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more 99212

This is a routine check-up for patients who have previously seen the doctor. During this 10-19 minute visit, the doctor will review your health status, discuss any concerns, and manage ongoing treatments or medications. It's a chance to ensure your health is on track.

95 services75 patients

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

65 services47 patients

Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope 43239

This procedure involves using a thin, flexible tube with a light and camera, known as an endoscope, to examine the esophagus, stomach, and upper part of the small intestine. Small tissue samples are taken for further examination to help diagnose various conditions.

61 services60 patients

Insertion of guide wire with dilation of esophagus using a flexible endoscope 43248

This is a procedure where a thin tube, called an endoscope, is gently passed through your mouth into your esophagus. A guide wire is then inserted to help widen any narrow areas. This helps improve swallowing and reduce discomfort.

47 services46 patients

New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more 99203

This service involves an initial office or outpatient visit for a new patient. The healthcare professional will spend 30-44 minutes understanding your health history, current issues, and discussing possible treatment plans. It's a comprehensive evaluation to start your healthcare journey.

39 services39 patients

Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope 43235

This procedure, known as an upper endoscopy, involves inserting a thin, flexible tube with a camera down the throat to examine the esophagus, stomach, and upper small bowel. It helps diagnose conditions like ulcers or inflammation.

26 services26 patients

Removal of polyps or growths of large bowel using an endoscope with mechanical snare 45385

This procedure involves using a thin, flexible tube called an endoscope to examine the large bowel. If any abnormal growths or polyps are found, a tool called a mechanical snare is used to remove them. This is a common method to prevent potential health issues.

22 services22 patients

Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes 99222

Initial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.

20 services20 patients

Biopsy of large bowel using a flexible endoscope 45380

A biopsy of the large bowel using a flexible endoscope is a procedure where a thin, flexible tube with a camera is inserted through the rectum to examine the bowel. If abnormal tissue is found, a small sample is taken for further examination. This helps in diagnosing conditions like inflammation, polyps, or cancer.

18 services18 patients

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232

Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.

18 services15 patients

Removal of polyps or growths of large bowel using a flexible endoscope with electrical cautery 45384

This procedure involves using a flexible tube with a camera, called an endoscope, to view the large intestine. If any abnormal growths or polyps are found, they are removed with an electrically-heated instrument. This is a common way to prevent bowel issues.

16 services16 patients

Diagnostic exam of large bowel using a flexible endoscope 45378

This procedure, known as a colonoscopy, involves using a flexible tube with a light and camera to examine the large intestine. It helps detect any abnormalities such as polyps or inflammation. It's a standard procedure to ensure gut health.

14 services13 patients

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

12 services12 patients

Colorectal cancer screening; colonoscopy on individual at high risk G0105

Colorectal cancer screening, specifically a colonoscopy, is a preventive measure for those at high risk. A thin, flexible tube with a camera inspects the colon to spot any abnormal growths. This test helps detect potential issues early, enhancing the effectiveness of treatment.

12 services12 patients

Hospital Affiliations CMS Care Compare 4

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

Ascension Saint Thomas Hospital

Acute Care Hospitals · Nashville, TN

3/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number440082

Location4220 Harding Rd, PO Box 380Nashville, TN 37205 · Davidson County

Emergency services Birthing friendly

Saint Thomas River Park Hospital

Acute Care Hospitals · Mcminnville, TN

5/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number440151

Location1559 Sparta StreetMcminnville, TN 37110 · Warren County

Emergency services Birthing friendly

Regional One Health

Acute Care Hospitals · Memphis, TN

1/5 CMS rating

OwnershipGovernment - Hospital District or Authority

CMS Certification Number440152

Location877 Jefferson AvenueMemphis, TN 38103 · Shelby County

Emergency services Birthing friendly

Livingston Regional Hospital

Acute Care Hospitals · Livingston, TN

2/5 CMS rating

OwnershipProprietary

CMS Certification Number440187

Location315 Oak St Box 550Livingston, TN 38570 · Overton County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 37203 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

$121.80 typical visit price

range $52.64 – $160.89

Typical copayment $30.45 (range $13.16 – $40.22)

Most-billed visit code 99204

Established Patient

$93.60 typical visit price

range $16.72 – $131.41

Typical copayment $23.40 (range $4.18 – $32.85)

Most-billed visit code 99214

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

Other Providers at the Same Location NPPES

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

THE BRIGGS INSTITUTE, INC.

Marriage & Family Therapist

1916 PATTERSON ST STE 203
NASHVILLE, TN 37203

Davidson County (615) 593-3999

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 William Alexander's NPI number?

The NPI number for William Alexander is 1609848738. It was assigned to this individual provider in the NPPES registry on February 2, 2006.

Where is William Alexander located?

William Alexander practices at 1916 Patterson St Ste 203, Nashville, TN 37203. The listed phone number is (615) 327-7835.

What is William Alexander's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Is William Alexander enrolled in Medicare?

Yes. William Alexander is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for William Alexander's services?

According to the CMS Revalidation Reassignment List (October 2026 release), William Alexander reassigns Medicare benefits to 6 organizations: Saint Thomas Medical Partners (Nashville, TN), Advanced Diagnostic Imaging, PC (Goodlettsville, TN), Advanced Specialists, PC (Goodlettsville, TN), Sumner Physician Practices LLC (Hendersonville, TN), Cookeville Regional Medical Group, Inc (Cookeville, TN) and 1 more organization, listed in the Medicare section above. 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 William Alexander's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does William Alexander accept?

Health plans from Ambetter Health, Ambetter from Arkansas Health & Wellness, Ambetter of Alabama, Ambetter of North Carolina and Ambetter of Tennessee and 4 other insurers list William Alexander as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is William Alexander affiliated with any hospitals?

According to CMS data, William Alexander is affiliated with Ascension Saint Thomas Hospital, Saint Thomas River Park Hospital, Regional One Health and Livingston Regional Hospital.

When was this NPI record last updated?

The NPPES record for William Alexander was last updated on October 1, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 20 days 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.