WILLIAM DAVID FARRAR M.D.
NPI 1942263108
Internal Medicine - Gastroenterology in Red Wing, MN

Q: What is William Farrar's NPI number?

The NPI number for William Farrar is 1942263108. It was assigned to this individual provider in the NPPES registry on April 10, 2006.

Q: What is William Farrar'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 Farrar was last updated on September 29, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 years 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 April 10, 2006PECOS EnrolledAccepts Medicare Assignment

701 HEWITT BLVD, RED WING, MN 55066(651) 267-5000 Get Directions Write a Review

NPPES record last updated: September 29, 2020. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Sep 29, 2020, Mar 4, 2019 (2 updates tracked since 2019).

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About William David Farrar M.d. NPPES

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

WILLIAM DAVID FARRAR M.D. (NPI 1942263108) is an individual gastroenterology provider in Red Wing, Minnesota, licensed in Minnesota (43646) and active in the NPI registry since April 2006. He is enrolled in Medicare PECOS, is affiliated with Mayo Clinic Hospital Rochester, and maintains a secondary practice location in Rochester.

NPPES Registry Identity

NPI1942263108

Entity TypeIndividualMale

Primary Taxonomy207RG0100X

Provider Legal NameWILLIAM DAVID FARRARCredential: M.D.

Location Address701 HEWITT BLVDRed Wing, MN 55066-2848

Mailing Address701 Hewitt BlvdRed Wing, MN 55066-2848 · (651) 267-5000

Phone(651) 267-5000

Sole ProprietorNo

Medical School CMSUniversity Of Colorado School Of Medicine, DenverGraduated 1998

Enumeration DateApril 10, 2006

Last NPPES UpdateSeptember 29, 20202 updates tracked since enumeration

NPPES CertifiedSeptember 29, 2020

✔ NPI 1942263108 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 MN · 43646

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.

701 HEWITT BLVD, Red Wing, MN 55066

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Secondary Practice Location 1

Location 1200 1st St SWROCHESTER, MN 55905-0001 · Phone (507) 284-2511

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Sanford Health Plan, Security Health Plan.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

William David Farrar 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 ID2668483991

PECOS Enrollment IDI20060525000149

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 Farrar reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Mayo Clinic Health System-Southeast Minnesota Region

3.2 mi

Multi-Specialty

701 HEWITT BLVD
Red Wing, MN 55066

Reassigned Medicare billing, Minnesota enrollment
Also billed through NPI 1063435410 (Minnesota)
1,571 clinicians in this Medicare group

NPI 1114453883 (651) 267-5000

Mayo Clinic Health System-Lake City

16 mi

Critical Access

500 W GRANT ST
Lake City, MN 55041

Reassigned Medicare billing, Minnesota enrollment
Also billed through NPI 1164463659 (Minnesota)
675 clinicians in this Medicare group

NPI 1538113022 (651) 345-3321

Mayo Clinic

38 mi

Infectious Disease

200 1ST ST SW
Rochester, MN 55905

Reassigned Medicare billing, Minnesota enrollment
6,534 clinicians in this Medicare group

NPI 1114343860 (507) 284-2511

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 8

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.

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.

137 services137 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.

51 services51 patients

Balloon dilation of esophagus, stomach, and/or upper small bowel using a flexible endoscope, less than 3.0 cm 43249

This procedure involves using a flexible tube with a camera, called an endoscope, to gently expand narrowed areas in your esophagus, stomach, or upper small bowel. A small balloon is inflated, making it easier for food and liquid to pass through. It's safe and effective.

27 services25 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.

25 services25 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.

22 services22 patients

Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk G0121

Colorectal cancer screening, such as a colonoscopy, is a preventive measure to detect early signs of cancer in the large intestine. For individuals not at high risk, it's typically recommended at age 50. A small, flexible tube with a camera is used to examine your colon. It's a safe, effective way to catch issues early.

21 services21 patients

Hospital Affiliations CMS Care Compare 4

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

Mayo Clinic Hospital Rochester

Acute Care Hospitals · Rochester, MN

5/5 CMS rating

OwnershipVoluntary non-profit - Church

CMS Certification Number240010

Location1216 Second Street SouthwestRochester, MN 55902 · Olmsted County

Emergency services Birthing friendly

Mayo Clinic Health System In Red Wing

Acute Care Hospitals · Red Wing, MN

4/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number240018

Location701 Hewitt BoulevardRed Wing, MN 55066 · Goodhue County

Emergency services Birthing friendly

Mayo Clinic Health System - Lake City

Critical Access Hospitals · Lake City, MN

OwnershipVoluntary non-profit - Private

CMS Certification Number241338

Location500 West Grant StreetLake City, MN 55041 · Wabasha County

Emergency services

Mayo Clinic Health System - Cannon Falls

Critical Access Hospitals · Cannon Falls, MN

OwnershipVoluntary non-profit - Private

CMS Certification Number241346

Location32021 County 24 BoulevardCannon Falls, MN 55009 · Goodhue County

Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 55066 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

$127.61 typical visit price

range $56.00 – $168.28

Typical copayment $31.90 (range $14.00 – $42.07)

Most-billed visit code 99204

Established Patient

$98.61 typical visit price

range $18.32 – $138.04

Typical copayment $24.65 (range $4.58 – $34.51)

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 20

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

DOUGLAS STEVEN LARSEN PA-C

Physician Assistant