Geneva Alincastre Sagun, MD
Internal Medicine Physician · Kalamazoo, MI
Geneva Alincastre Sagun, MD is an internal medicine physician with a practice address in Kalamazoo, Michigan, and NPI 1588928642, issued on Jul 3, 2012. Check the license (Michigan 4301101658, as entered in NPPES) on the Michigan Board of Medicine (LARA); the Medicare figures below come from public CMS files.
- Name
- Geneva Alincastre Sagun
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 4301101658 MI
Self-reported in NPPES; status is on the state search - Practice location
- 4613 W Main St, Kalamazoo, MI 49006
- Phone
- (269) 488-8672
- Enumerated
- Jul 3, 2012
- Record last updated
- Dec 20, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (269) 488-8673
- Medicare enrollment
- Enrolled (PECOS I20210719003331); 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 4613 W Main St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Melissa Davidson, M.D.Internal Medicine Physician1740259332
- Jennifer Driscoll, M.D.Internal Medicine Physician1609804715
- Marc Hinze, M.P.T.Physical Therapist1104866573
- Jennifer Houtman, MDFamily Medicine Physician1750372033
Verify Geneva Alincastre Sagun in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMichigan Board of Medicine (LARA)
Search for license 4301101658Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
5% fewer Medicare Part D claims than the average internal medicine physician in 2024
3,026 Medicare Part D claims for 295 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims. 97 claims were for opioids.
Most prescribed
- Atorvastatin Calcium212 claims
- Losartan Potassium150 claims
- Amlodipine Besylate146 claims
- Levothyroxine Sodium137 claims
- Gabapentin98 claims
- Lisinopril97 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: $14.33
1 payment: food and beverage; the largest payer was Pfizer Inc. The 50,334 providers of this specialty with any payment received $1,303.06 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
- Permanente Medical Group IncModesto, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Geneva Alincastre Sagun among 5,735 internal medicine physician records in Michigan
Geneva Alincastre Sagun, MD 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 2012, is newer than 59% of them.
- NPI issued2012 · 59% of these records are older, 39% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2012 · median 2006 among the 3,564 with a school on file
- Record last updated2021 · 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).
158 internal medicine physician records list a practice address in Kalamazoo
They are 158 of the 6,553 NPPES records with a practice address in Kalamazoo, and 5,735 internal medicine physician records in Michigan.
All 5,735 in Michigan → Every provider in Kalamazoo → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Melissa Davidson, M.D.Kalamazoo, MI 490061740259332
- Jennifer Driscoll, M.D.Kalamazoo, MI 490061609804715
- Brigitte Engelmann, MD/PHDKalamazoo, MI 490061215344197
- Amber Fausneaucht, DOKalamazoo, MI 490061235667726
- Richard Semones, MDKalamazoo, MI 490061356606933
- Desmonda Wixson, MDKalamazoo, MI 490061013947522
- Hussein Akl, MDKalamazoo, MI 490071699757849
- Owen Berow, MDKalamazoo, MI 490071275526600
Common questions
What is Geneva Alincastre Sagun, MD's NPI number?
Geneva Alincastre Sagun, MD's National Provider Identifier (NPI) is 1588928642, issued on Jul 3, 2012. An NPI identifies a provider in billing; it is not a license.
Where is Geneva Alincastre Sagun, MD located?
The NPPES record lists a practice address at 4613 W Main St, Kalamazoo, MI, 49006. Phone: (269) 488-8672. Providers update this record themselves, so call before visiting.
How can I verify Geneva Alincastre Sagun, MD's license?
NPPES lists Michigan license number 4301101658, 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 Geneva Alincastre Sagun, MD prescribe under Medicare Part D?
In 2024, Geneva Alincastre Sagun, MD had 3,026 Medicare Part D claims for 295 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.