John Bartnik, M.D.
NPI 1740211275 · Hematology & Oncology Physician · Saginaw, MI
Enrolled with Medicare as Practitioner - Hematology/Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Bartnik, M.D. is a Hematology & Oncology Physician provider in Saginaw, MI (NPI 1740211275).
Provider details
- NPI number
- 1740211275
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- JB062933 (MI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
3 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
2,298 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 450 | $121 |
| Complete Blood Cell Count (red Cells, White Blood Cell, Platelets), Automated Test and Automated Differential White Blood Cell Count85025 | 393 | $8 |
| Infusion Into a Vein for Therapy, Prevention, Or Diagnosis, Additional Sequential Infusion, 1 Hour Or Less96367 | 234 | $26 |
| Blood Test, Comprehensive Group of Blood Chemicals80053 | 232 | $10 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 213 | $9 |
| Administration of Chemotherapy Into Vein, 1 Hour Or Less96413 | 173 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 29 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Anastrozole | 129 | 48 |
| Prochlorperazine Maleate | 97 | 74 |
| Letrozole | 86 | 31 |
| Ondansetron Hcl | 84 | 64 |
| Dexamethasone | 74 | 48 |
| Lenalidomidebrand: Revlimid | 57 | 13 |
| Acyclovir | 54 | 14 |
| Lenalidomide | 53 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$715 across 29 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (2)
- 2050 E Caro RdCaro, MI 48723-9320Phone: (989) 672-5001Fax: (989) 672-5003
- 2431 S M 30West Branch, MI 48661-9351Phone: (989) 343-2487Fax: (989) 343-2489
Registry dates
- Enumerated
- 2006-07-05
- Last updated
- 2021-03-26
- Certified
- 2021-03-26
Frequently asked questions
- What is John Bartnik's NPI number?
- John Bartnik's National Provider Identifier (NPI) is 1740211275, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Bartnik's specialty?
- John Bartnik is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is John Bartnik located?
- John Bartnik's practice location on file with NPPES is 5400 Mackinaw Rd., Saginaw, MI 48604-9533.
- What is John Bartnik's phone number?
- The practice phone number listed in the NPPES registry for John Bartnik is (989) 791-2330.
- Does John Bartnik accept Medicare?
- John Bartnik is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Bartnik's NPI active?
- Yes — John Bartnik's NPI (1740211275) is active in the NPPES registry as of the last update on 2021-03-26.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.