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ONCOLOGY HEMATOLOGY ASSOCIATES OF SAGINAW VALLEY PC
NPI 1366472169
Internal Medicine - Hematology & Oncology in Saginaw, MI

Active since July 04, 2006
5400 MACKINAW RD., SUITE 4200, SAGINAW, MI 48604(989) 791-2330(989) 791-2329 Get Directions Write a Review

NPPES record last updated: March 26, 2021. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Mar 26, 2021, Mar 31, 2020 (2 updates tracked since 2020).

About Oncology Hematology Associates Of Saginaw Valley Pc NPPES

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

ONCOLOGY HEMATOLOGY ASSOCIATES OF SAGINAW VALLEY PC (NPI 1366472169) is a healthcare organization registered as a hematology & oncology in Saginaw, Michigan and active in the NPI registry since July 2006. The organization maintains 2 additional practice locations and lists John K Bartnik, Owner/president, as its authorized official.

NPPES Registry Identity

NPI1366472169
Entity TypeOrganization
Primary Taxonomy207RH0003X
Legal Business NameONCOLOGY HEMATOLOGY ASSOCIATES OF SAGINAW VALLEY PC
Location Address5400 MACKINAW RD., SUITE 4200Saginaw, MI 48604-9533
Mailing Address5400 Mackinaw Rd., Suite 4200Saginaw, MI 48604-9533 · (989) 791-2330 · Fax (989) 791-2329
Phone(989) 791-2330
Fax(989) 791-2329
Organization SubpartNo
Authorized OfficialJohn K BartnikOwner/president · (989) 791-2330
Enumeration DateJuly 4, 2006
Last NPPES UpdateMarch 26, 20212 updates tracked since enumeration
NPPES CertifiedMarch 26, 2021
✔ NPI 1366472169 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Hematology & OncologyAllopathic & Osteopathic Physicians
Taxonomy Code207RH0003X
Definition
An internist doctor of osteopathy that specializes in the treatment of the combination of hematology and oncology disorders. A doctor of osteopathy that is board eligible/certified by the American Osteopathic Board of Internal Medicine WAS able to obtain a Certificate of Special Qualifications in the field of Hematology and Oncology. The Certificate is NO longer offered.
5400 MACKINAW RD., Saginaw, MI 48604
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Secondary Practice Locations 2

Location 12050 E Caro RdCaro, MI 48723-9320 · Phone (989) 672-5001 · Fax (989) 672-5003
Location 22431 S M 30West Branch, MI 48661-9351 · Phone (989) 343-2487 · Fax (989) 343-2489

Other Identifiers 2

OtherDE9161MI · Railroad Medicare
Other0G31085MI · Blue Cross/blue Shield

Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X MULTIPLE SINGLE SPECIALTY GROUP

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.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, revalidation and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Oncology Hematology Associates Of Saginaw Valley Pc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Medicare Revalidation Due Date

Revalidation due by February 28, 2027

Medicare-enrolled providers and suppliers confirm their enrollment information with CMS on a set cycle, every 5 years for most and every 3 years for medical equipment suppliers. CMS sets the due date for each enrollment.

StateEnrollment IDDue date
StateMichiganEnrollment IDO20040706001033Non-DME Part B · Clinic/Group PracticeDue dateFebruary 28, 2027
Source: CMS Revalidation Due Date List, October 2026 release.

Clinicians Billing Medicare Through This Organization

5

Medicare enrollment records show 5 clinicians reassign Medicare billing to Oncology Hematology Associates Of Saginaw Valley PC, which bills Medicare for the services they deliver. Of these, 3 practice at this address. They are listed nearest first.

Clinicians, nearest first (5)

John Bartnik, M.D.
Hematology/Oncology
NPI 1740211275
5400 MACKINAW RD. SUITE 4200
Saginaw, MI 48604
(989) 791-2330
✔ PECOS✔ Accepts MedicareSame address
Bei Liu, MD, PHD
Hematology/Oncology
NPI 1508887829
5400 MACKINAW RD SUITE 4200
Saginaw, MI 48604
(989) 791-2330
✔ PECOS✔ Accepts MedicareSame address
Shannon Ochoa, DNP
Nurse Practitioner
NPI 1942803002
5400 MACKINAW RD STE 4200
Saginaw, MI 48604
(989) 791-2330
✔ PECOS✔ Accepts MedicareSame address
Bonnie Stallings, FNP-C
Nurse Practitioner
NPI 1215467782
302 KENSINGTON AVE
Flint, MI 48503
(810) 762-8400
✔ PECOS✔ Accepts Medicare36 mi
Daniel Ezekwudo, M.D
Internal Medicine
NPI 1942649769
22395 EDGEWATER DR
Port Charlotte, FL 33980
(941) 766-7222
✔ PECOS✔ Accepts Medicare1,144 mi

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

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 Oncology Hematology Associates Of Saginaw Valley PC's NPI number?

The NPI number for Oncology Hematology Associates Of Saginaw Valley PC is 1366472169. It was assigned to this organization in the NPPES registry on July 4, 2006.

Where is Oncology Hematology Associates Of Saginaw Valley PC located?

Oncology Hematology Associates Of Saginaw Valley PC is located at 5400 Mackinaw Rd. Suite 4200, Saginaw, MI 48604. The listed phone number is (989) 791-2330.

What is Oncology Hematology Associates Of Saginaw Valley PC's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Hematology & Oncology, with taxonomy code 207RH0003X.

Is Oncology Hematology Associates Of Saginaw Valley PC enrolled in Medicare?

Yes. Oncology Hematology Associates Of Saginaw Valley PC is registered in the Medicare PECOS enrollment system.

When is Oncology Hematology Associates Of Saginaw Valley PC's Medicare revalidation due?

According to the CMS Revalidation Due Date List (October 2026 release), the Medicare Non-DME Part B enrollment for this organization (Michigan, Clinic/Group Practice) is due for revalidation by February 28, 2027. Medicare providers and suppliers revalidate their enrollment every 5 years, and medical equipment suppliers every 3 years. Confirm current requirements with your Medicare Administrative Contractor.

How many clinicians bill Medicare through Oncology Hematology Associates Of Saginaw Valley PC?

According to the CMS Revalidation Reassignment List (October 2026 release), 5 clinicians reassign their Medicare billing to Oncology Hematology Associates Of Saginaw Valley PC, in Hematology/Oncology, Internal Medicine and Nurse Practitioner. A 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 the clinician's services. Of these, 3 practice at this address. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

What insurance does Oncology Hematology Associates Of Saginaw Valley PC accept?

Health plans from Ambetter Health, Ambetter from Buckeye Health Plan and Ambetter from Meridian list Oncology Hematology Associates Of Saginaw Valley PC 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 Oncology Hematology Associates Of Saginaw Valley PC was last updated on March 26, 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.