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- 710 Oak St, Winnetka, IL 60093
About Dr. Croghan
John Croghan, M.D. practices internal medicine in Winnetka, IL. John is a 1986 graduate of Rush Medical College of Rush University. According to Medicare claims data, John cared for 1,097 Medicare patients across 4,566 services. The services billed most often include injection, denosumab, 1 mg, established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more, and insertion of needle into vein for collection of blood sample. The provider's National Provider Identifier (NPI) is 1790724060.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (847) 840-1470
- Email not available
Practice Locations
710 OAK ST
Winnetka, IL 60093
Conditions Commonly Evaluated or Treated
Within Internal Medicine generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Cancer Prevention
Cancer risk
Environmental health
- Asbestos Exposure
- Contaminated drinking water exposure
- Heat exhaustion and heat stroke
- Radon gas exposure
- Tick bite and Lyme disease risk
- Toxic Mold Exposure
- Wildfire smoke and air pollution exposure
- Workplace Chemical Exposure
General wellness
Heart health
Infectious Disease
Infectious disease
Kidney health
Lifestyle & wellness
Lifestyle health
Longevity
Metabolic & Lifestyle
Occupational health
Occupational Health
Rashes & allergy
Sexual Health
Sexual health
Substance use
Travel health
Wellness and energy
Workplace health
Most searched conditions
Cardiometabolic
Digestive and liver
Endocrine, blood, and bone
Kidney and urinary
Respiratory
Blood & Circulation
Blood disorders
Brain & Nerves
Brain and nerves
Cardiac and vascular
Digestive
Heart & Circulation
Infections
Kidney & Bladder
Lungs & Breathing
Mental Health
Neurologic and behavioral
Pain
Rheumatologic and pain
Procedures & services
Addiction & habits
Cancer screening
Cancer Screening
Checkups & exams
Chronic illness
Diagnostics & screening
Environmental health
Fitness & body composition
Heart & Circulation
- Blood Pressure Check
- Heart monitor
Heart & circulation
Heart health
Hospital-based procedures
Imaging referral
Immunizations
Infection & Microbiology Tests
- STI and STD Screening
- H. Pylori Breath Test
Lifestyle & Prevention
Longevity
Lower endoscopy
Lungs & Breathing
Metabolic & Weight
Metabolic health
Occupational health
Occupational Health
Office Procedures
Preventive and evaluation
- Preoperative medical clearance
- Medication management
- Post-hospital transitional care
Preventive imaging
Preventive screening
Routine Blood Tests
Screening & labs
Screening and diagnostic testing
- Blood pressure screening
- Cancer screening and prevention planning
- Diabetes and prediabetes screening
- EKG
- Spirometry
Screenings & Diagnostics
Travel Health
Travel medicine
Wellness
Wellness & Screening
Workplace health
Skin growths
- Skin Tag Removal
Sleep
- At-home sleep test
Most searched procedures
Bones & Joints
Brain and nerves
Digestive
- Endoscopy
Exams & Consultations
Lab tests
Minor procedures
- Ingrown toenail removal
- Suture removal
Office procedures
- Cryotherapy for skin lesions
- Earwax removal
- Incision and drainage of an abscess
- Skin biopsy
Pain management
Preventive & Routine Care
Sexual health
Procedures Most Often Billed to Medicare
4,566 services · 1,097 patients · 16 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Insertion of needle into vein for collection of blood sample | Procedure | 36415 |
255 | More often than most peers in Internal Medicine |
| Ct scan of chest without contrast | Imaging | 71250 |
26 | As often as other peers in Internal Medicine |
| X-ray of chest, 2 views | Imaging | 71046 |
24 | As often as other peers in Internal Medicine |
| Ct scan of lower spine without contrast | Imaging | 72131 |
12 | Too few peers to compare |
| Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report | Treatment | 93000 |
154 | More often than most peers in Internal Medicine |
| Injection of drug or substance under skin or into muscle | Treatment | 96372 |
79 | More often than most peers in Internal Medicine |
| Influenza vaccine, inactivated | Treatment | 90653 |
76 | More often than most peers in Internal Medicine |
| Pneumococcal conjugate vaccine, 20 valent (pcv20), for intramuscular use | Treatment | 90677 |
45 | More often than most peers in Internal Medicine |
| Injection, denosumab, 1 mg | Drug given | J0897 |
2,220 | More often than most peers in Internal Medicine |
| Injection, vitamin b-12 cyanocobalamin, up to 1000 mcg | Drug given | J3420 |
48 | As often as other peers in Internal Medicine |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other internists at this location 2
Same specialty, same street address — most likely the same department or group.
Also at this address 1
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Other internists in Winnetka 7
Same specialty, same city.
More connections — 24 related providers in 3 groups
Trained at Rush Medical College of Rush University 8
Other providers in the same specialty who trained at the same institution.
Class of 1986 at Rush Medical College of Rush University 8
Providers who graduated from the same medical school in the same year.
Also performs Insertion of needle into vein for collection of blood sample 8
Providers in IL who bill this service to Medicare most often.
Common questions
What is John Croghan's specialty?
John Croghan is an internist in Winnetka, IL. That is the designation recorded for this NPI in the federal registry, where it is listed as “Internal Medicine”.
NPI registry
Where can I find John Croghan?
John Croghan is listed at 710 Oak St, Winnetka, IL 60093. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact John Croghan?
The number on file is (847) 840-1470. Contact the office directly to confirm availability and scheduling.
NPI registry
What is John Croghan's NPI number?
John Croghan's National Provider Identifier is 1790724060. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
What is John Croghan's education?
John Croghan attended Rush Medical College of Rush University, graduating in 1986. This comes from the CMS National Downloadable File.
CMS public data
How long has John Croghan been practicing?
John Croghan has 40 years experience. Calculated from a graduation year of 1986, reported in the CMS National Downloadable File.
CMS public data
What is John Croghan known for?
According to Medicare billing data, John Croghan performs procedures including insertion of needle into vein for collection of blood sample; reads or performs imaging such as ct scan of chest without contrast and x-ray of chest, 2 views; provides treatments such as routine electrocardiogram using at least 12 leads with interpretation and report and injection of drug or substance under skin or into muscle, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has John Croghan confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by John Croghan. If this is you, claiming it is free.
Guide.md
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