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

DR. WILLIAM B WEEMS MD
NPI 1003856295
Anesthesiology in Rockford, IL

Q: What is William Weems's NPI number?

The NPI number for William Weems is 1003856295. It was assigned to this individual provider in the NPPES registry on June 7, 2006.

Q: What is William Weems's specialty?

The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.

Q: When was this NPI record last updated?

The NPPES record for William Weems was last updated on June 26, 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.

Active since June 07, 2006PECOS EnrolledAccepts Medicare Assignment

5875 E RIVERSIDE BLVD, ROCKFORD, IL 61114(815) 398-9491(815) 381-7498 Get Directions Write a Review

NPPES record last updated: June 26, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: Sep 3, 2024, Jul 26, 2024 (2 updates tracked since 2024).

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About Dr. William B Weems Md NPPES

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

DR. WILLIAM B WEEMS MD (NPI 1003856295) is an individual anesthesiology provider in Rockford, Illinois, licensed in Illinois (036101350) and active in the NPI registry since June 2006. He is enrolled in Medicare PECOS, is affiliated with Advocate Sherman Hospital, and is a graduate of University Of Chicago, Pritzker School Of Medicine (1996).

NPPES Registry Identity

NPI1003856295

Entity TypeIndividualMale

Primary Taxonomy207L00000X

Provider Legal NameDR. WILLIAM B WEEMSCredential: MD

Location Address5875 E RIVERSIDE BLVDRockford, IL 61114-4937

Mailing AddressPo Box 735263Chicago, IL 60673-5263 · (815) 398-9491 · Fax (815) 381-7498

Phone(815) 398-9491

Fax(815) 381-7498

Sole ProprietorNo

Medical School CMSUniversity Of Chicago, Pritzker School Of MedicineGraduated 1996

Enumeration DateJune 7, 2006

Last NPPES UpdateJune 26, 20262 updates tracked since enumeration

NPPES CertifiedJune 26, 2026

✔ NPI 1003856295 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyAnesthesiologyAllopathic & Osteopathic Physicians

Taxonomy Code207L00000X

License✔ Licensed in IL · 036101350

Definition

An anesthesiologist is trained to provide pain relief and maintenance, or restoration, of a stable condition during and immediately following an operation or an obstetric or diagnostic procedure. The anesthesiologist assesses the risk of the patient undergoing surgery and optimizes the patient's condition prior to, during and after surgery. In addition to these management responsibilities, the anesthesiologist provides medical management and consultation in pain management and critical care medicine. Anesthesiologists diagnose and treat acute, long-standing and cancer pain problems; diagnose and treat patients with critical illnesses or severe injuries; direct resuscitation in the care of patients with cardiac or respiratory emergencies, including the need for artificial ventilation; and supervise post-anesthesia recovery.

5875 E RIVERSIDE BLVD, Rockford, IL 61114

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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. William B Weems 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 ID4486552502

PECOS Enrollment IDI20040806000861

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.

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.

Injection of anesthetic agent and/or steroid into thigh nerve (femoral nerve) 64447

This procedure involves injecting a numbing agent and/or steroid into a nerve in your thigh. It's done to alleviate pain or inflammation. A needle will be carefully positioned near the nerve, and the medicine will be administered.

20 services20 patients

Injection of anesthetic agent and/or steroid into other nerve or branch 64450

This procedure involves injecting an anesthetic agent or steroid into a specific nerve or its branch. The goal is to relieve pain by reducing inflammation and numbing the area. It is commonly used for chronic pain management. The process is safe and usually quick.

19 services19 patients

Hospital Affiliations CMS Care Compare 2

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

Advocate Sherman Hospital

Acute Care Hospitals · Elgin, IL

4/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number140030

Location1425 North Randall RoadElgin, IL 60123 · Kane County

Emergency services Birthing friendly

Javon Bea Hospital

Acute Care Hospitals · Rockford, IL

3/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number140239

Location8201 E Riverside BlvdRockford, IL 61114 · Winnebago County

Emergency services Birthing friendly

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. LIZA A DAFCHAHI SHIRANI MD

Anesthesiology