1. Home
  2. Directory
  3. Arizona
  4. Tucson
  5. Internal Medicine
  6. NPI Profile

DR. WILLIAM ZIARNIK
NPI 1619072501
Internal Medicine in Tucson, AZ

Active since September 14, 2006PECOS Enrolled
2945 W INA RD, VA NORTHWEST TUCSON CLINIC, TUCSON, AZ 85741(520) 219-2418(520) 219-2332 Get Directions Write a Review

NPPES record last updated: June 1, 2010. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Dr. William Ziarnik NPPES

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

DR. WILLIAM ZIARNIK (NPI 1619072501) is an individual internal medicine provider in Tucson, Arizona, licensed in California (G76194) and active in the NPI registry since September 2006. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1619072501
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameDR. WILLIAM ZIARNIK
Location Address2945 W INA RD, VA NORTHWEST TUCSON CLINICTucson, AZ 85741-2350
Mailing Address2945 W. Ina Rd, Va Northwest Tucson ClinicTucson, AZ 85741-2350 · (520) 219-2418 · Fax (520) 219-2332
Phone(520) 219-2418
Fax(520) 219-2332
Sole ProprietorNo
Enumeration DateSeptember 14, 2006
Last NPPES UpdateJune 1, 2010
✔ NPI 1619072501 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in CA · G76194
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
2945 W INA RD, Tucson, AZ 85741
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 Ziarnik 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 Ziarnik reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Brentview Medical Inc.
446 mi
Urgent Care
11611 SAN VICENTE BLVD, GROUND FLOOR
Los Angeles, CA 90049
  • Reassigned Medicare billing, California enrollment
  • 6 clinicians in this Medicare group
NPI 1447581350 (310) 820-0013

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 3

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.

Detection test by immunoassay with direct visual observation for influenza virus 87804
This is a test that identifies the influenza virus in your body. It works by using an immunoassay, a method that detects the presence of the virus through an immune response. The results are directly observable, making it a quick and efficient way to diagnose flu.
28 services14 patients
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.
19 services18 patients
Detection test by immunoassay technique for severe acute respiratory syndrome coronavirus 87426
An immunoassay test for severe acute respiratory syndrome coronavirus is a diagnostic tool. It uses your body's immune response to detect the presence of the virus. It involves taking a sample, usually from your nose or throat, which is then analyzed in a lab for signs of the virus.
17 services17 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 85741 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
$127.71 typical visit price
range $55.44 – $168.60
Typical copayment $31.92 (range $13.86 – $42.15)
Most-billed visit code 99204
Established Patient
$98.00 typical visit price
range $17.72 – $137.41
Typical copayment $24.50 (range $4.43 – $34.35)
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 20

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

MONIKA THAPA
Student in an Organized Health Care Education/Training Program
2945 W INA RD
TUCSON, AZ 85741
Pima County (520) 682-4111
MRS. CYNTHIA GOMEZ SMITH F.N.P.
Nurse Practitioner (Family)
2945 W INA RD
TUCSON, AZ 85741
Pima County (520) 219-6616
DR. DENNIS SWENA MD, MPH
Preventive Medicine (Occupational Medicine)
2945 W INA RD, SUITE 103
TUCSON, AZ 85741
Pima County (520) 877-8600
DR. JENNIFER KHAN MD
Student in an Organized Health Care Education/Training Program
2945 W INA RD
TUCSON, AZ 85741
Pima County (520) 682-4111
SWATHI GALIDEVARA MD
Student in an Organized Health Care Education/Training Program
2945 W INA RD
TUCSON, AZ 85741
Pima County (520) 616-6790
U.S. HEALTHWORKS MEDICAL GROUP OF ARIZONA, INC.
Clinic/Center (Urgent Care)
2945 W INA RD, SUITE 103
TUCSON, AZ 85741
Pima County (520) 877-8600
PAULA S HASSEN MD
Pediatrics
2945 W INA RD
TUCSON, AZ 85741
Pima County (520) 219-6616
NORTHWEST HOSPITAL LLC
Clinic/Center (Urgent Care)
2945 W INA RD
TUCSON, AZ 85741
Pima County (520) 469-8266

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 Ziarnik's NPI number?

The NPI number for William Ziarnik is 1619072501. It was assigned to this individual provider in the NPPES registry on September 14, 2006.

Where is William Ziarnik located?

William Ziarnik practices at 2945 W Ina Rd VA Northwest Tucson Clinic, Tucson, AZ 85741. The listed phone number is (520) 219-2418.

What is William Ziarnik's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is William Ziarnik enrolled in Medicare?

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

Which organization bills Medicare for William Ziarnik's services?

According to the CMS Revalidation Reassignment List (October 2026 release), William Ziarnik reassigns Medicare benefits to Brentview Medical Inc. (Los Angeles, CA). 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 Ziarnik'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 Ziarnik was last updated on June 1, 2010. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 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.