Gary Stephen Ferenchick, M.D.
Internal Medicine Physician · East Lansing, MI
Gary Stephen Ferenchick, M.D. is an internal medicine physician with a practice address in East Lansing, Michigan, and NPI 1891703666, issued on Aug 4, 2006. Check the license (Michigan 4301049491, as entered in NPPES) on the Michigan Board of Medicine (LARA); the Medicare figures below come from public CMS files.
- Name
- Gary Stephen Ferenchick
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 4301049491 MI
Self-reported in NPPES; status is on the state search - Practice location
- 804 Service Road, East Lansing, MI 48824
- Phone
- (517) 353-4941
- Enumerated
- Aug 4, 2006
- Record last updated
- May 1, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (517) 432-3145
- Medicaid IDs
- 1863850 MI
1891703666 MI - Medicare enrollment
- Enrolled (PECOS I20081202000086); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 5,735 in Michigan → Look up another NPI →
Also registered at 804 Service Road
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Gary Stephen Ferenchick in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMichigan Board of Medicine (LARA)
Search for license 4301049491Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
31% fewer Medicare Part D claims than the average internal medicine physician in 2024
2,207 Medicare Part D claims for 145 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 15% of claims. 40 claims were for opioids.
Most prescribed
- Atorvastatin Calcium202 claims
- Amlodipine Besylate124 claims
- Lisinopril117 claims
- Levothyroxine Sodium89 claims
- Simvastatin71 claims
- Tamsulosin Hcl70 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.
Bills Medicare through 2 group practices
- Edward W Sparrow Hospital AssociationLansing, MI
- Msu Health Care Inc.East Lansing, MI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gary Stephen Ferenchick among 5,735 internal medicine physician records in Michigan
Gary Stephen Ferenchick, M.D. is one of 5,735 internal medicine physician records with a practice address in Michigan. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 10% of them.
- NPI issued2006 · 10% of these records are older, 60% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated1984 · median 2006 among the 3,564 with a school on file
- Record last updated2012 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Michigan practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
49 internal medicine physician records list a practice address in East Lansing
They are 49 of the 2,305 NPPES records with a practice address in East Lansing, and 5,735 internal medicine physician records in Michigan.
All 5,735 in Michigan → Every provider in East Lansing → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- La Claire Bouknight, M.D.East Lansing, MI 488241174567226
- Keith Camann, M.D.East Lansing, MI 488241245273515
- Michael Darabos, MDEast Lansing, MI 488241679701189
- Francesca Dwamena, M.D.East Lansing, MI 488241619913530
- Kevin Foley, MDEast Lansing, MI 488241750335865
- Suman Kashyap, MDEast Lansing, MI 488241174534283
- Shilpa Kavuturu, M.D.East Lansing, MI 488241831365170
- Robert Smith, M.D.East Lansing, MI 488241194823534
Common questions
What is Gary Stephen Ferenchick, M.D.'s NPI number?
Gary Stephen Ferenchick, M.D.'s National Provider Identifier (NPI) is 1891703666, issued on Aug 4, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gary Stephen Ferenchick, M.D. located?
The NPPES record lists a practice address at 804 Service Road, East Lansing, MI, 48824. Phone: (517) 353-4941. Providers update this record themselves, so call before visiting.
How can I verify Gary Stephen Ferenchick, M.D.'s license?
NPPES lists Michigan license number 4301049491, 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 Gary Stephen Ferenchick, M.D. prescribe under Medicare Part D?
In 2024, Gary Stephen Ferenchick, M.D. had 2,207 Medicare Part D claims for 145 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.