1. Home
  2. Directory
  3. Illinois
  4. Rockford
  5. Optometrist
  6. NPI Profile

DR. WILLIAM C HILLMANN OD
NPI 1629039789
Optometrist in Rockford, IL

Active since March 29, 2006PECOS Enrolled
1603 N ALPINE RD, STE 121, ROCKFORD, IL 61107(815) 209-9420(815) 425-5244 Get Directions Write a Review

NPPES record last updated: August 11, 2021. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Dr. William C Hillmann Od NPPES

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

DR. WILLIAM C HILLMANN OD (NPI 1629039789) is an individual optometrist in Rockford, Illinois, licensed in Illinois (046-009168) and active in the NPI registry since March 2006. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1629039789
Entity TypeIndividualMale
Primary Taxonomy152W00000X
Provider Legal NameDR. WILLIAM C HILLMANNCredential: OD
Location Address1603 N ALPINE RD, STE 121Rockford, IL 61107-1439
Mailing Address1603 N Alpine Rd, Ste 121Rockford, IL 61107-1439 · (815) 209-9420 · Fax (815) 425-5244
Phone(815) 209-9420
Fax(815) 425-5244
Sole ProprietorYes
Enumeration DateMarch 29, 2006
Last NPPES UpdateAugust 11, 2021
NPPES CertifiedAugust 11, 2021
✔ NPI 1629039789 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyOptometristEye and Vision Services Providers
Taxonomy Code152W00000X
License✔ Licensed in IL · 046-009168
Definition
Doctors of optometry (ODs) are the primary health care professionals for the eye. Optometrists examine, diagnose, treat, and manage diseases, injuries, and disorders of the visual system, the eye, and associated structures as well as identify related systemic conditions affecting the eye. An optometrist has completed pre-professional undergraduate education in a college or university and four years of professional education at a college of optometry, leading to the doctor of optometry (O.D.) degree. Some optometrists complete an optional residency in a specific area of practice. Optometrists are eye health care professionals state-licensed to diagnose and treat diseases and disorders of the eye and visual system.
Also ListedOptometrist · Corneal and Contact ManagementTaxonomy 152WC0802X · License 046009168 (IL)
1603 N ALPINE RD, Rockford, IL 61107
Open in Google Maps ↗

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. William C Hillmann Od 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 Hillmann reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Christina J. Levi O D P C
246 mi
Optometrist
2100 TROY RD
Edwardsville, IL 62025
  • Reassigned Medicare billing, Illinois enrollment
  • 127 clinicians in this Medicare group
NPI 1477703411 (618) 656-8888

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 61107 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
$127.46 typical visit price
range $54.80 – $168.44
Typical copayment $31.86 (range $13.70 – $42.11)
Most-billed visit code 99204
Established Patient
$68.64 typical visit price
range $17.16 – $136.56
Typical copayment $17.16 (range $4.29 – $34.14)
Most-billed visit code 99213
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 3

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

DR. CHARVI D. PATEL OD
Optometrist
1603 N ALPINE RD, SUITE 121
ROCKFORD, IL 61107
Winnebago County (815) 397-5959
PRIMARY EYE CARE CENTERS, PC
Optometrist
1603 N ALPINE RD, ST 121
ROCKFORD, IL 61107
Winnebago County (815) 209-9420
YOUNG HEE LEE
Optometrist
1603 N ALPINE RD, SUITE 121
ROCKFORD, IL 61107
Winnebago County (815) 397-5959

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 Hillmann's NPI number?

The NPI number for William Hillmann is 1629039789. It was assigned to this individual provider in the NPPES registry on March 29, 2006.

Where is William Hillmann located?

William Hillmann practices at 1603 N Alpine Rd Ste 121, Rockford, IL 61107. The listed phone number is (815) 209-9420.

What is William Hillmann's specialty?

The primary specialty registered for this NPI is Optometrist with taxonomy code 152W00000X.

Is William Hillmann enrolled in Medicare?

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

Which organization bills Medicare for William Hillmann's services?

According to the CMS Revalidation Reassignment List (October 2026 release), William Hillmann reassigns Medicare benefits to Christina J. Levi O D P C (Edwardsville, IL). The 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 Hillmann'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 Hillmann was last updated on August 11, 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.