John Croghan, M.D.
Internal Medicine Physician · Winnetka, IL
John Croghan, M.D. is an internal medicine physician with a practice address in Winnetka, Illinois, and NPI 1790724060, issued on Jun 5, 2006. Check the license (Illinois 036076821, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- John Croghan
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 036076821 IL
Self-reported in NPPES; status is on the state search - Practice location
- 710 Oak St, Winnetka, IL 60093
- Phone
- (847) 840-1470
- Enumerated
- Jun 5, 2006
- Record last updated
- Feb 3, 2016 (not updated in 10 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20050929000673); accepts Medicare assignment
- Medical or professional school
- Rush Medical College Of Rush University, 1986
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
Also registered at 710 Oak St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Santiago Candocia, M.D.Internal Medicine Physician1780764019
- Richard Stern, M.D.Internal Medicine Physician1427139765
Verify John Croghan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIllinois Department of Financial and Professional Regulation
Search for license 036076821Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
18% more Medicare Part D claims than the average internal medicine physician in 2024
3,758 Medicare Part D claims for 178 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims. 45 claims were for opioids.
Most prescribed
- Atorvastatin Calcium241 claims
- Levothyroxine Sodium225 claims
- Amlodipine Besylate210 claims
- Pantoprazole Sodium159 claims
- Rosuvastatin Calcium150 claims
- Escitalopram Oxalate148 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 one group practice
- Dedication Health LLCWinnetka, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
18 internal medicine physician records list a practice address in Winnetka
They are 18 of the 205 NPPES records with a practice address in Winnetka, and 7,238 internal medicine physician records in Illinois.
All 18 in Winnetka → All 7,238 in Illinois → Every provider in Winnetka →
Other internal medicine physician records in Illinois
- Peter Abadeer, D.O.Bloomington, IL1760469522
- Motaz Abas, MDPeoria, IL1215510201
- Elias Abate, M.D.Chicago, IL1336712199
- Maliha Abbas, D.O.Chicago, IL1174963920
- Zareena Abbas, MDChicago, IL1427078872
- Abu Abbasi, MDChicago, IL1083243877
- Ayesha Abbasi, MDChicago, IL1376216705
- Khalda Abbasi, MDNaperville, IL1487705240
- Elmer Abbo, MDBurr Ridge, IL1710048541
- Paul Abbo, M.D.River Forest, IL1083693378
Common questions
What is John Croghan, M.D.'s NPI number?
John Croghan, M.D.'s National Provider Identifier (NPI) is 1790724060, issued on Jun 5, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John Croghan, M.D. located?
The NPPES record lists a practice address at 710 Oak St, Winnetka, IL, 60093. Phone: (847) 840-1470. Providers update this record themselves, so call before visiting.
How can I verify John Croghan, M.D.'s license?
NPPES lists Illinois license number 036076821, as entered by the provider. Search the Illinois Department of Financial and Professional Regulation at https://idfpr.illinois.gov/checklicense.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does John Croghan, M.D. prescribe under Medicare Part D?
In 2024, John Croghan, M.D. had 3,758 Medicare Part D claims for 178 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.