WILLIAM ZATO DO
NPI 1497796809
Family Medicine in Merrillville, IN
About William Zato Do NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
WILLIAM ZATO DO (NPI 1497796809) is an individual family medicine provider in Merrillville, Indiana, licensed in Indiana (02000629A) and active in the NPI registry since June 2006. He is enrolled in Medicare PECOS and is a graduate of Midwestern University, Chicago College Of Osteopathic Med (1976).
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
William Zato Do 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 Zato reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Munster, IN 46321
- Reassigned Medicare billing, Indiana enrollment
- Medicare enrollment name: Advanced Care Medical Specialists PC
- 12 clinicians in this Medicare group
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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 46410 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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.
MERRILLVILLE, IN 46410
MERRILLVILLE, IN 46410
MERRILLVILLE, IN 46410
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 Zato's NPI number?
The NPI number for William Zato is 1497796809. It was assigned to this individual provider in the NPPES registry on June 9, 2006.
Where is William Zato located?
William Zato practices at 7805 Taft St Ste E, Merrillville, IN 46410. The listed phone number is (219) 230-4667.
What is William Zato's specialty?
The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.
Is William Zato enrolled in Medicare?
Yes. William Zato 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 Zato's services?
According to the CMS Revalidation Reassignment List (October 2026 release), William Zato reassigns Medicare benefits to Advanced Care Medical Specialists, P.C. (Munster, IN). 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 Zato'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 Zato was last updated on August 18, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.
# William Zato, DO · NPI 1497796809
Family Medicine physician in Merrillville, Indiana. Individual provider, active in the CMS NPPES registry since June 9, 2006.
## Identity
- **NPI:** 1497796809 (Entity type: Individual)
- **Enumerated:** June 9, 2006
- **Primary specialty:** Family Medicine · taxonomy 207Q00000X
- **State license:** 02000629A (Indiana)
- **Sole proprietor:** No
## Practice location
- **Address:** 7805 TAFT ST STE E, Merrillville, IN 46410-5237
- **Phone:** (219) 230-4667 · **Fax:** (219) 756-3793
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Advanced Care Medical Specialists, P.C. (NPI 1689030918, Munster, IN), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Midwestern University, Chicago College Of Osteopathic Med, class of 1976
## Record status
- **NPPES last updated:** August 18, 2020
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Source: [NPI Profile](https://npiprofile.com/npi/1497796809) · Data from the CMS NPPES public registry.