WILLIAM SIKOV MD
NPI 1811916661
Internal Medicine - Hematology & Oncology in Providence, RI

Q: What is William Sikov's NPI number?

The NPI number for William Sikov is 1811916661. It was assigned to this individual provider in the NPPES registry on July 19, 2006.

Q: What is William Sikov's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Hematology & Oncology, with taxonomy code 207RH0003X.

Q: When was this NPI record last updated?

The NPPES record for William Sikov was last updated on June 16, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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 July 19, 2006PECOS EnrolledAccepts Medicare Assignment

1 BLACKSTONE STREET, 2ND FLOOR, PROVIDENCE, RI 02903(401) 453-7520 Get Directions Write a Review

NPPES record last updated: June 16, 2021. Verified against the NPPES registry weekly; last sync: October 25, 2026.

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About William Sikov Md NPPES

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

WILLIAM SIKOV MD (NPI 1811916661) is an individual hematology & oncology provider in Providence, Rhode Island, licensed in Rhode Island (MD7581) and active in the NPI registry since July 2006. He is enrolled in Medicare PECOS, is affiliated with Rhode Island Hospital, and maintains a secondary practice location in Providence.

NPPES Registry Identity

NPI1811916661

Entity TypeIndividualMale

Primary Taxonomy207RH0003X

Provider Legal NameWILLIAM SIKOVCredential: MD

Location Address1 BLACKSTONE STREET, 2ND FLOORProvidence, RI 02903-0290

Mailing Address101 Dudley StProvidence, RI 02905-2401 · (401) 274-1100

Phone(401) 453-7520

Sole ProprietorNo

Medical School CMSYale University School Of MedicineGraduated 1982

Enumeration DateJuly 19, 2006

Last NPPES UpdateJune 16, 2021

NPPES CertifiedMarch 31, 2021

✔ NPI 1811916661 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 3

★ Primary SpecialtyInternal Medicine · Hematology & OncologyAllopathic & Osteopathic Physicians

Taxonomy Code207RH0003X

License✔ Licensed in RI · MD7581

Definition

An internist doctor of osteopathy that specializes in the treatment of the combination of hematology and oncology disorders. A doctor of osteopathy that is board eligible/certified by the American Osteopathic Board of Internal Medicine WAS able to obtain a Certificate of Special Qualifications in the field of Hematology and Oncology. The Certificate is NO longer offered.

Also ListedInternal Medicine · HematologyTaxonomy 207RH0000X · License MD7581 (RI)

Also ListedInternal Medicine · Medical OncologyTaxonomy 207RX0202X · License MD7581 (RI)

1 BLACKSTONE STREET, Providence, RI 02903

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Secondary Practice Location 1

Location 1101 Dudley StProvidence, RI 02905-2401 · Phone (401) 274-1100

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 Sikov Md 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 ID8527081793

PECOS Enrollment IDI20060113000456

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 Sikov reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Affinity Physicians LLC

19 mi

Anesthesiology

101 DUDLEY STREET, WIH DEPT OF ANESTHESIOLOGY
Providence, RI 02905

Reassigned Medicare billing, Rhode Island enrollment
984 clinicians in this Medicare group

NPI 1053038471 (401) 274-1122

Wih Faculty Physicians, Inc

31 mi

Gynecologic Oncology

373 NEW BOSTON RD STE 3
Fall River, MA 02720

Reassigned Medicare billing, Massachusetts enrollment
26 clinicians in this Medicare group

NPI 1669590295 (508) 235-3500

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 2

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 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.

152 services42 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.

84 services73 patients

Hospital Affiliations CMS Care Compare 4

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

Rhode Island Hospital

Acute Care Hospitals · Providence, RI

3/5 CMS rating

OwnershipTribal

CMS Certification Number410007

Location593 Eddy StreetProvidence, RI 02903 · Providence County

Emergency services

Kent County Memorial Hospital

Acute Care Hospitals · Warwick, RI

3/5 CMS rating

OwnershipProprietary

CMS Certification Number410009

Location455 Toll Gate RdWarwick, RI 02886 · Kent County

Emergency services Birthing friendly

Women & Infants Hospital Of Rhode Island

Acute Care Hospitals · Providence, RI

3/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number410010

Location101 Dudley StreetProvidence, RI 02905 · Providence County

Emergency services Birthing friendly

The Miriam Hospital

Acute Care Hospitals · Providence, RI

5/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number410012

Location164 Summit AvenueProvidence, RI 02906 · Providence County

Emergency services

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

$177.03 typical visit price

range $58.57 – $177.03

Typical copayment $44.25 (range $14.64 – $44.25)

Most-billed visit code 99205

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 17

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

DR. MOHAMMED ALI JALOUDI MD

Internal Medicine (Medical Oncology)

1 BLACKSTONE STREET, 2ND FLOOR
PROVIDENCE, RI 02903

Providence County (401) 453-7520

ELIZABETH RICCI NP

Nurse Practitioner (Women's Health)

1 BLACKSTONE STREET, WIH PROGRAM IN WOMEN'S ONCOLOGY
PROVIDENCE, RI 02903

Providence County (401) 453-7520

DR. LUCY ZHANG MD

Surgery (Surgical Oncology)

1 BLACKSTONE STREET, 2ND FLOOR
PROVIDENCE, RI 02903

Providence County (401) 453-7520

DR. LORRAINE TAFRA MD

Surgery

1 BLACKSTONE STREET, 2ND FLOOR
PROVIDENCE, RI 02903

Providence County (401) 453-7520

JULIA ROSE SALINARO MD

Obstetrics & Gynecology (Gynecologic Oncology)

1 BLACKSTONE STREET, 3RD FLOOR
PROVIDENCE, RI 02903

Providence County (401) 453-7052

DR. AMY HUI MD

Surgery (Surgical Oncology)

1 BLACKSTONE STREET, 2ND FL
PROVIDENCE, RI 02903

Providence County (401) 453-7520

STEPHANIE LYNN CHEVES NP

Nurse Practitioner (Gerontology)

1 BLACKSTONE STREET, 3 RD FLOOR
PROVIDENCE, RI 02903

Providence County (401) 453-7520

MS. MARCINA LYNN BEASTON-CASEY MS, CGC

Genetic Counselor, MS

1 BLACKSTONE STREET, FLOOR 2
PROVIDENCE, RI 02903

Providence County (401) 453-7520

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 Sikov's NPI number?

The NPI number for William Sikov is 1811916661. It was assigned to this individual provider in the NPPES registry on July 19, 2006.

Where is William Sikov located?

William Sikov practices at 1 Blackstone Street 2nd Floor, Providence, RI 02903. The listed phone number is (401) 453-7520.

What is William Sikov's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Hematology & Oncology, with taxonomy code 207RH0003X.

Is William Sikov enrolled in Medicare?

Yes. William Sikov 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 Sikov's services?

According to the CMS Revalidation Reassignment List (October 2026 release), William Sikov reassigns Medicare benefits to 2 organizations: Affinity Physicians LLC (Providence, RI) and Wih Faculty Physicians, Inc (Fall River, MA). 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 Sikov's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Is William Sikov affiliated with any hospitals?

According to CMS data, William Sikov is affiliated with Rhode Island Hospital, Kent County Memorial Hospital, Women & Infants Hospital Of Rhode Island and The Miriam Hospital.

When was this NPI record last updated?

The NPPES record for William Sikov was last updated on June 16, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.