DR. WILLIAM M SONAK D.C.
NPI 1336179183
Chiropractor in Sterling, VA
About Dr. William M Sonak D.c. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. WILLIAM M SONAK D.C. (NPI 1336179183) is an individual chiropractor in Sterling, Virginia, licensed in Virginia (0104555566) and active in the NPI registry since July 2006. He is a graduate of Other (1999).
NPPES Registry Identity
Specialties & Licenses
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
Dr. William M Sonak D.c. 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.
Medicare Billing Reassignment
Medicare enrollment records show William Sonak reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Sterling, VA 20164
- Reassigned Medicare billing, Virginia enrollment
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
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.
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 Sonak's NPI number?
The NPI number for William Sonak is 1336179183. It was assigned to this individual provider in the NPPES registry on July 4, 2006.
Where is William Sonak located?
William Sonak practices at 46859 Harry Byrd Hwy. Suite 102, Sterling, VA 20164. The listed phone number is (703) 406-0200.
What is William Sonak's specialty?
The primary specialty registered for this NPI is Chiropractor with taxonomy code 111N00000X.
Is William Sonak enrolled in Medicare?
Yes. William Sonak 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 organization bills Medicare for William Sonak's services?
According to the CMS Revalidation Reassignment List (October 2026 release), William Sonak reassigns Medicare benefits to Sonak Family Chiropractic (Sterling, VA). 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 Sonak'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 Sonak was last updated on July 8, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 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.
# Dr. William M Sonak, D.C. · NPI 1336179183
Chiropractor provider in Sterling, Virginia. Individual provider, active in the CMS NPPES registry since July 4, 2006.
## Identity
- **NPI:** 1336179183 (Entity type: Individual)
- **Enumerated:** July 4, 2006
- **Primary specialty:** Chiropractor · taxonomy 111N00000X
- **State license:** 0104555566 (Virginia)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 46859 HARRY BYRD HWY. SUITE 102, Sterling, VA 20164
- **Phone:** (703) 406-0200
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Bills Medicare through:** Sonak Family Chiropractic (NPI 1760555866, Sterling, VA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1999
## Record status
- **NPPES last updated:** July 8, 2007
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Source: [NPI Profile](https://npiprofile.com/npi/1336179183) · Data from the CMS NPPES public registry.