Sonya Inderbitzin-Fischer, MD
NPI 1184128670 · Hematology (Internal Medicine) Physician · Grand Rapids, MI
Enrolled with Medicare as Practitioner - Hematology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Sonya Inderbitzin-Fischer, MD is a Hematology (Internal Medicine) Physician provider in Grand Rapids, MI (NPI 1184128670).
Provider details
- NPI number
- 1184128670
- Entity type
- Individual
- Primary specialty
- Hematology (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 4301511732 (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
8 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
407 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) |
|---|---|---|
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 82 | $9 |
| Complete Blood Cell Count (red Cells, White Blood Cell, Platelets), Automated Test and Automated Differential White Blood Cell Count85025 | 80 | $8 |
| Blood Test, Comprehensive Group of Blood Chemicals80053 | 57 | $10 |
| Injection of Additional New Drug Or Substance Into Vein96375 | 40 | $14 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 33 | $172 |
| Administration of Chemotherapy Into Vein, 1 Hour Or Less96413 | 28 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 8 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Acyclovir | 38 | 16 |
| Prednisone | 34 | 11 |
| Dexamethasone | 20 | 11 |
| Hydroxyurea | 16 | — |
| Prochlorperazine Maleate | 16 | 12 |
| Venetoclaxbrand: Venclexta | 12 | — |
| Olanzapine | 11 | — |
| Allopurinol | 11 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$364 across 7 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
Registry dates
- Enumerated
- 2018-03-20
- Last updated
- 2024-07-16
- Certified
- 2024-07-16
Frequently asked questions
- What is Sonya Inderbitzin-Fischer's NPI number?
- Sonya Inderbitzin-Fischer's National Provider Identifier (NPI) is 1184128670, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Sonya Inderbitzin-Fischer's specialty?
- Sonya Inderbitzin-Fischer is listed in the NPPES registry with a primary specialty of Hematology (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is Sonya Inderbitzin-Fischer located?
- Sonya Inderbitzin-Fischer's practice location on file with NPPES is 5800 Foremost Dr Se Ste 200, Grand Rapids, MI 49546-7062.
- What is Sonya Inderbitzin-Fischer's phone number?
- The practice phone number listed in the NPPES registry for Sonya Inderbitzin-Fischer is (163) 891-8006.
- Does Sonya Inderbitzin-Fischer accept Medicare?
- Sonya Inderbitzin-Fischer is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Sonya Inderbitzin-Fischer's NPI active?
- Yes — Sonya Inderbitzin-Fischer's NPI (1184128670) is active in the NPPES registry as of the last update on 2024-07-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.