John C. Vassallo, M.D.
Internal Medicine Physician · Howell, MI
John C. Vassallo, M.D. is an internal medicine physician with a practice address in Howell, Michigan, and NPI 1275590119, issued on Apr 26, 2006. Check the license (Michigan JV078585, as entered in NPPES) on the Michigan Board of Medicine (LARA); the Medicare figures below come from public CMS files.
- Name
- John C. Vassallo
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- JV078585 MI
Self-reported in NPPES; status is on the state search - Practice location
- 1225 W Grand River Ave Ste 300, Howell, MI 48843
- Phone
- (517) 548-0010
- Enumerated
- Apr 26, 2006
- Record last updated
- May 11, 2023
- Fax
- (517) 548-5326
- Medicare enrollment
- Enrolled (PECOS I20050714000875); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 5,735 in Michigan → Look up another NPI →
Also registered at 1225 W Grand River Ave Ste 300
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Freddy KeysFamily Nurse Practitioner1134508120
Verify John C. Vassallo in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMichigan Board of Medicine (LARA)
Search for license JV078585Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
11.4 times the Medicare Part D claims of the average internal medicine physician in 2024
36,068 Medicare Part D claims for 906 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 641 claims were for opioids.
Most prescribed
- Atorvastatin Calcium2,608 claims
- Levothyroxine Sodium1,583 claims
- Furosemide1,216 claims
- Eliquis1,100 claims
- Lisinopril994 claims
- Amlodipine Besylate961 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: $1,083.01
57 payments; by number, the most common kind was food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. 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
- Medical Office OF John Vassallo MD PLLCHowell, MI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John C. Vassallo among 5,735 internal medicine physician records in Michigan
John C. Vassallo, 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
- Graduated2001 · median 2006 among the 3,564 with a school on file
- Record last updated2023 · 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).
11 internal medicine physician records list a practice address in Howell
They are 11 of the 1,026 NPPES records with a practice address in Howell, and 5,735 internal medicine physician records in Michigan.
All 5,735 in Michigan → Every provider in Howell → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Aaron Daniel, M.D.Howell, MI 488431164434718
- Shruti Devineni, DOHowell, MI 488431053873539
- Sara Husain, MDHowell, MI 488431689908501
- Carranda Koop, M.D.Howell, MI 488431023437456
- Jacqueleen Magon, MDHowell, MI 488431992742464
- Zehra Noorani, M. D.Howell, MI 488431427091032
- Syed Shahab, M. D.Howell, MI 488431912940123
- Joseph Skandalaris, D.O.Howell, MI 488431477557056
Common questions
What is John C. Vassallo, M.D.'s NPI number?
John C. Vassallo, M.D.'s National Provider Identifier (NPI) is 1275590119, issued on Apr 26, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John C. Vassallo, M.D. located?
The NPPES record lists a practice address at 1225 W Grand River Ave Ste 300, Howell, MI, 48843. Phone: (517) 548-0010. Providers update this record themselves, so call before visiting.
How can I verify John C. Vassallo, M.D.'s license?
NPPES lists Michigan license number JV078585, 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 John C. Vassallo, M.D. prescribe under Medicare Part D?
In 2024, John C. Vassallo, M.D. had 36,068 Medicare Part D claims for 906 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.