ZACHARY PATRICK TOLSTYKA MD
NPI 1518596238
Pediatrics - Pediatric Hematology-Oncology in Ann Arbor, MI

Q: What is Zachary Tolstyka's NPI number?

The NPI number for Zachary Tolstyka is 1518596238. It was assigned to this individual provider in the NPPES registry on April 4, 2020.

Q: What is Zachary Tolstyka's specialty?

The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Hematology-Oncology, with taxonomy code 2080P0207X.

Q: When was this NPI record last updated?

The NPPES record for Zachary Tolstyka was last updated on July 15, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 months 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 April 04, 2020PECOS Enrolled

1500 E MEDICAL CENTER DR, ANN ARBOR, MI 48109(734) 936-4000 Get Directions Write a Review

NPPES record last updated: July 15, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Jul 15, 2026, Jul 7, 2023, May 27, 2022 and 1 more (4 updates tracked since 2020).

On this page

About Zachary Patrick Tolstyka Md NPPES

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

ZACHARY PATRICK TOLSTYKA MD (NPI 1518596238) is an individual pediatric hematology-oncology provider in Ann Arbor, Michigan, licensed in Michigan (4301508837) and active in the NPI registry since April 2020. He is enrolled in Medicare PECOS, maintains a secondary practice location in Ann Arbor, and is a graduate of Wayne State University School Of Medicine (2020).

NPPES Registry Identity

NPI1518596238

Entity TypeIndividualMale

Primary Taxonomy2080P0207X

Provider Legal NameZACHARY PATRICK TOLSTYKACredential: MD

Location Address1500 E MEDICAL CENTER DRAnn Arbor, MI 48109-5000

Mailing Address3621 S State StAnn Arbor, MI 48108-1633 · (734) 647-5299

Phone(734) 936-4000

Sole ProprietorNo

Medical School CMSWayne State University School Of MedicineGraduated 2020

Enumeration DateApril 4, 2020

Last NPPES UpdateJuly 15, 20264 updates tracked since enumeration

NPPES CertifiedJuly 15, 2026

✔ NPI 1518596238 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 3

★ Primary SpecialtyPediatrics · Pediatric Hematology-OncologyAllopathic & Osteopathic Physicians

Taxonomy Code2080P0207X

License✔ Licensed in MI · 4301508837

Definition

A pediatrician trained in the combination of pediatrics, hematology and oncology to recognize and manage pediatric blood disorders and cancerous diseases.

Also ListedPediatricsTaxonomy 208000000X · License 4301508837 (MI)

Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X

1500 E MEDICAL CENTER DR, Ann Arbor, MI 48109

Open in Google Maps ↗

Secondary Practice Location 1

Location 11522 Simpson Road EastAnn Arbor, MI 48109-5718 · Phone (734) 232-5933 · Fax (734) 998-2261

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Buckeye Health Plan, Ambetter from Meridian, Ambetter Health and more.Insurance ›

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Zachary Patrick Tolstyka Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID2163846130

PECOS Enrollment IDI20260724003415

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 Zachary Tolstyka reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Regents Of The University Of Michigan

Same address

Nephrology

1500 E MEDICAL CENTER DR
Ann Arbor, MI 48109

Reassigned Medicare billing, Michigan enrollment
2,377 clinicians in this Medicare group

NPI 1003848144 (734) 936-4000

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

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.

LOKMAN SUNG MD

Pathology (Forensic Pathology)

1500 E MEDICAL CENTER DR, 2ND FLOOR UNIVERSITY HOSPITAL RECP PATHOLOGY
ANN ARBOR, MI 48109

Washtenaw County (800) 862-7284

SAMEER DEV SAINI M.D.

Internal Medicine (Gastroenterology)

1500 E MEDICAL CENTER DR
ANN ARBOR, MI 48109

Washtenaw County (734) 936-4000

KYLE DAVID PERRY MD

Pathology (Cytopathology)

1500 E MEDICAL CENTER DR
ANN ARBOR, MI 48109

Washtenaw County (734) 936-4000

DR. DAVID ALEXANDER STEWART M.D.

Pediatrics

1500 E MEDICAL CENTER DR, 12TH FLOOR C.S. MOTT CHILDREN'S HOSPITAL ROOM 525
ANN ARBOR, MI 48109

Washtenaw County (734) 763-5302

DR. MICHAEL EDMUND WATSON MD

Pediatrics (Pediatric Infectious Diseases)

1500 E MEDICAL CENTER DR
ANN ARBOR, MI 48109

Washtenaw County (734) 936-4000

CARRIE KRAEGER PORTER PA-C

Physician Assistant

1500 E MEDICAL CENTER DR
ANN ARBOR, MI 48109

Washtenaw County (734) 936-6666

DENISE LYNN BERRY CRNA

Nurse Anesthetist, Certified Registered

1500 E MEDICAL CENTER DR
ANN ARBOR, MI 48109

Washtenaw County (734) 936-4000

KETTI SOPHIA PETERSEN MD

Family Medicine (Hospice and Palliative Medicine)

1500 E MEDICAL CENTER DR
ANN ARBOR, MI 48109

Washtenaw County (734) 936-4000

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 Zachary Tolstyka's NPI number?

The NPI number for Zachary Tolstyka is 1518596238. It was assigned to this individual provider in the NPPES registry on April 4, 2020.

Where is Zachary Tolstyka located?

Zachary Tolstyka practices at 1500 E Medical Center Dr, Ann Arbor, MI 48109. The listed phone number is (734) 936-4000.

What is Zachary Tolstyka's specialty?

The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Hematology-Oncology, with taxonomy code 2080P0207X.

Is Zachary Tolstyka enrolled in Medicare?

Yes. Zachary Tolstyka is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Zachary Tolstyka's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Zachary Tolstyka reassigns Medicare benefits to Regents Of The University Of Michigan (Ann Arbor, MI). 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 Zachary Tolstyka's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Zachary Tolstyka accept?

Health plans from Ambetter Health, Ambetter from Buckeye Health Plan, Ambetter from Meridian, Blue Care Network of Michigan and Blue Cross Blue Shield of Michigan Mutual Insurance Company and 1 other insurer list Zachary Tolstyka as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Zachary Tolstyka was last updated on July 15, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 months 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.