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

WILLIAM ELLIS DOAK
NPI 1477243772
Internal Medicine in Providence, RI

Active since May 10, 2023PECOS Enrolled
593 EDDY ST, PROVIDENCE, RI 02903(401) 444-4741(401) 444-4445 Get Directions Write a Review

NPPES record last updated: September 4, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Sep 4, 2026, Jun 23, 2023, May 24, 2023 and 1 more (4 updates tracked since 2023).

About William Ellis Doak NPPES

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

WILLIAM ELLIS DOAK (NPI 1477243772) is an individual internal medicine provider in Providence, Rhode Island, licensed in Rhode Island (MD21364) and active in the NPI registry since May 2023. He is enrolled in Medicare PECOS, maintains a secondary practice location in Providence, and is a graduate of Warren Alpert Medical School Of Brown University (2023).

NPPES Registry Identity

NPI1477243772
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameWILLIAM ELLIS DOAK
Location Address593 EDDY STProvidence, RI 02903-4923
Mailing Address15 Lasalle SquareProvidence, RI 02903-1814 · (401) 444-2369 · Fax (401) 444-6912
Phone(401) 444-4741
Fax(401) 444-4445
Sole ProprietorNo
Medical School CMSWarren Alpert Medical School Of Brown UniversityGraduated 2023
Enumeration DateMay 10, 2023
Last NPPES UpdateSeptember 4, 20264 updates tracked since enumeration
NPPES CertifiedSeptember 4, 2026
✔ NPI 1477243772 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in RI · MD21364
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
593 EDDY ST, Providence, RI 02903
Open in Google Maps ↗

Secondary Practice Location 1

Location 1245 Chapman St Ste 300Providence, RI 02905-4539 · Phone (401) 444-4741 · Fax (401) 444-4445

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

William Ellis Doak is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID7719343524
PECOS Enrollment IDI20260714002373
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

2

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

Lifespan Physician Group, Inc.
0.1 mi
General Practice
593 EDDY ST
Providence, RI 02903
  • Reassigned Medicare billing, Rhode Island enrollment
  • 1,372 clinicians in this Medicare group
NPI 1407116643 (401) 444-6779
Rhode Island Hospital
0.1 mi
Multi-Specialty
593 EDDY ST
Providence, RI 02903
  • Reassigned Medicare billing, Rhode Island enrollment
  • 358 clinicians in this Medicare group
NPI 1154537520 (401) 444-6905

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 02903 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
$134.17 typical visit price
range $58.57 – $177.03
Typical copayment $33.54 (range $14.64 – $44.25)
Most-billed visit code 99204
Established Patient
$103.10 typical visit price
range $18.92 – $144.38
Typical copayment $25.77 (range $4.73 – $36.09)
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.

DR. KEITH-AUSTIN SCARFO D.O.
Anesthesiology
593 EDDY ST, APC 6
PROVIDENCE, RI 02903
Providence County (401) 444-3777
AILEEN HSUEH
Surgery
593 EDDY ST
PROVIDENCE, RI 02903
Providence County (401) 444-8450
RHODE ISLAND HOSPITAL
General Acute Care Hospital
593 EDDY ST, MAIN 4
PROVIDENCE, RI 02903
Providence County (401) 444-7585
DR. GA HIE NAM M.D.
Pathology (Anatomic Pathology & Clinical Pathology)
593 EDDY ST
PROVIDENCE, RI 02903
Providence County (401) 444-5057
EUGENIE ATALLAH
Psychiatry & Neurology (Neurology)
593 EDDY ST
PROVIDENCE, RI 02903
Providence County (401) 606-2645
BRET CAULFIELD
Physician Assistant
593 EDDY ST
PROVIDENCE, RI 02903
Providence County (401) 444-4000
JUNG HO GONG
Student in an Organized Health Care Education/Training Program
593 EDDY ST
PROVIDENCE, RI 02903
Providence County (401) 793-2695
FANNY HUANG MD
Student in an Organized Health Care Education/Training Program
593 EDDY ST
PROVIDENCE, RI 02903
Providence County (401) 444-4741

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 Doak's NPI number?

The NPI number for William Doak is 1477243772. It was assigned to this individual provider in the NPPES registry on May 10, 2023.

Where is William Doak located?

William Doak practices at 593 Eddy St, Providence, RI 02903. The listed phone number is (401) 444-4741.

What is William Doak's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is William Doak enrolled in Medicare?

Yes. William Doak is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for William Doak's services?

According to the CMS Revalidation Reassignment List (October 2026 release), William Doak reassigns Medicare benefits to 2 organizations: Lifespan Physician Group, Inc. (Providence, RI) and Rhode Island Hospital (Providence, RI). 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 Doak'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 William Doak was last updated on September 4, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 56 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.