Sonya Joy Inderbitzin-Fischer, MD
Hematology (Internal Medicine) Physician · Grand Rapids, MI
Sonya Joy Inderbitzin-Fischer, MD is a hematology (internal medicine) physician with a practice address in Grand Rapids, Michigan, and NPI 1184128670, issued on Mar 20, 2018. Check the license (Michigan 4301511732, as entered in NPPES) on the Michigan Board of Medicine (LARA); the Medicare figures below come from public CMS files.
- Name
- Sonya Joy Inderbitzin-Fischer
- Credential
- MD
- Primary taxonomy
- Hematology (Internal Medicine) Physician 207RH0000X
- License number
- 4301511732 MI
Self-reported in NPPES; status is on the state search - Practice location
- 5800 Foremost Dr SE Ste 200, Grand Rapids, MI 49546
- Phone
- (163) 891-8006
- Enumerated
- Mar 20, 2018
- Record last updated
- Jul 16, 2024
- Medicare enrollment
- Enrolled (PECOS I20240711003285); accepts Medicare assignment
- Medical or professional school
- West Virginia University School Of Medicine, 2018
- Entity
- Type 1 · individual
8 nearest hematology (internal medicine) physician records → All 57 in Michigan → Look up another NPI →
Also registered at 5800 Foremost Dr SE Ste 200
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Joy BartholomewFamily Nurse Practitioner1265498208
- Luke Eastburg, MDHematology (Internal Medicine) Physician1649626508
- Elizabeth Pohl, NPGerontology Nurse Practitioner1033883723
- Tanya Rowerdink, N.P.Gerontology Nurse Practitioner1841720133
- Megan Sawyer, N.P.Family Nurse Practitioner1942603790
- Ryan Schipper, PA-CMedical Physician Assistant1356065932
Verify Sonya Joy Inderbitzin-Fischer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMichigan Board of Medicine (LARA)
Search for license 4301511732Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
45% fewer Medicare Part D claims than the average hematology (internal medicine) physician in 2024
273 Medicare Part D claims for 59 beneficiaries, against an average of 496 among the 1,036 providers of this specialty who prescribed in Part D. Brand-name drugs were 19% of claims.
Most prescribed
- Acyclovir38 claims
- Prednisone34 claims
- Dexamethasone20 claims
- Hydroxyurea16 claims
- Prochlorperazine Maleate16 claims
- Venclexta12 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $364.30
7 payments; by number, the most common kind was food and beverage; the largest payer was Genzyme Corporation. The 721 providers of this specialty with any payment received $13,778.35 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Cancer And Hematology Centers OF Western MI, P.C.Holland, MI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Sonya Joy Inderbitzin-Fischer among 57 hematology (internal medicine) physician records in Michigan
Sonya Joy Inderbitzin-Fischer, MD is one of 57 hematology (internal medicine) physician records with a practice address in Michigan. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2018, is newer than 95% of them.
- NPI issued2018 · 95% of these records are older, 2% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 79% of these records are
- Graduated2018 · median 2007 among the 45 with a school on file
- Record last updated2024 · 46% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RH0000X and a Michigan practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hematology (Internal Medicine) Physician providers in Michigan
There are 57 hematology (internal medicine) physician records in Michigan.
All 57 in Michigan → Every provider in Grand Rapids → Hematology (Internal Medicine) Physician nationwide →
The 8 hematology (internal medicine) physician records with the nearest ZIP codes
- Luke Eastburg, MDGrand Rapids, MI 495461649626508
- Louis Marks, M.D.Grand Rapids, MI 495251588660468
- John O'Donnell, M.D.Grand Rapids, MI 495251811993702
- David Oviatt, MDGrand Rapids, MI 495251164428298
- Yazan Migdady, M.D.Wyoming, MI 495191306157458
- Syed Muneer Abidi, MDGrand Rapids, MI 495031922045525
- Rupin ShahGrand Rapids, MI 495031073932695
- Daniel Arnold, MDMarquette, MI 498551124012661
Common questions
What is Sonya Joy Inderbitzin-Fischer, MD's NPI number?
Sonya Joy Inderbitzin-Fischer, MD's National Provider Identifier (NPI) is 1184128670, issued on Mar 20, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Sonya Joy Inderbitzin-Fischer, MD located?
The NPPES record lists a practice address at 5800 Foremost Dr SE Ste 200, Grand Rapids, MI, 49546. Phone: (163) 891-8006. Providers update this record themselves, so call before visiting.
How can I verify Sonya Joy Inderbitzin-Fischer, MD's license?
NPPES lists Michigan license number 4301511732, as entered by the provider. Search the Michigan Board of Medicine (LARA) at https://aca-prod.accela.com/MILARA/GeneralProperty/PropertyLookUp.aspx?isLicensee=Y&TabName=APO. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Sonya Joy Inderbitzin-Fischer, MD prescribe under Medicare Part D?
In 2024, Sonya Joy Inderbitzin-Fischer, MD had 273 Medicare Part D claims for 59 beneficiaries; the average among hematology (internal medicine) physician prescribers was 496. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.