WILLIAM J TREMAINE M.D.
NPI 1831176841
Internal Medicine - Gastroenterology in Rochester, MN

Q: What is William Tremaine's NPI number?

The NPI number for William Tremaine is 1831176841. It was assigned to this individual provider in the NPPES registry on December 30, 2005.

Q: What is William Tremaine'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 Tremaine was last updated on August 21, 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 December 30, 2005PECOS Enrolled

200 1ST ST SW, ROCHESTER, MN 55905(507) 284-2511 Get Directions Write a Review

NPPES record last updated: August 21, 2020. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Aug 21, 2020, May 1, 2019 (2 updates tracked since 2019).

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About William J Tremaine M.d. NPPES

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

WILLIAM J TREMAINE M.D. (NPI 1831176841) is an individual gastroenterology provider in Rochester, Minnesota, licensed in Minnesota (23670) and active in the NPI registry since December 2005. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1831176841

Entity TypeIndividualMale

Primary Taxonomy207RG0100X

Provider Legal NameWILLIAM J TREMAINECredential: M.D.

Location Address200 1ST ST SWRochester, MN 55905-0001

Mailing Address200 1st St SwRochester, MN 55905-0001 · (507) 284-2511

Phone(507) 284-2511

Sole ProprietorNo

Enumeration DateDecember 30, 2005

Last NPPES UpdateAugust 21, 20202 updates tracked since enumeration

NPPES CertifiedAugust 21, 2020

✔ NPI 1831176841 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 · 23670

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.

200 1ST ST SW, Rochester, MN 55905

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Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

William J Tremaine M.d. 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 Reassignment

Medicare enrollment records show William Tremaine reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Mayo Clinic

Same address

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.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 55905 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.

EMILY LEASURE MD

Internal Medicine