Physician Profile
John J. Hennessey, M.D.
Unclaimed ProfileAbout Dr. Hennessey
John J. Hennessey, M.D. is a healthcare provider in Gales Ferry, CT specializing in internal medicine. John trained at Tufts University School of Medicine, graduating in 1996. According to Medicare claims data, John cared for 3,113 Medicare patients across 8,813 services. The services billed most often include injection, denosumab, 1 mg, established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more, and urinalysis, manual test.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Specialty
Credentials & Licensing
License numbers are what the provider reported to NPPES when the NPI was issued or updated. NPPES does not verify licensure; confirm current standing with the state licensing board.
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
- (860) 464-7253
- Email not available
Practice Locations
1527 ROUTE 12 SUITE 1
Gales Ferry, CT 06335
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
Most searched conditions
- Allergies
- Diabetes
- Flu
- Hypothyroidism
- Strep throat
- UTI
Cardiometabolic
- High blood pressure
- High cholesterol
Digestive and liver
- Acid reflux
- Fatty liver disease
- IBS
Endocrine, blood, and bone
- Gout
Infectious disease
- Shingles
Kidney and urinary
- Chronic kidney disease
- Enlarged prostate
Respiratory
- Acute bronchitis
- Asthma
- COPD
Blood & Circulation
- Blood clots
Blood disorders
- Anemia
Brain & Nerves
- Alzheimer's disease
Brain and nerves
- Vertigo
Cardiac and vascular
- AFib
Digestive
- Diverticulitis
Heart & Circulation
- Heart disease
Infections
- Impetigo
Kidney & Bladder
- Overactive Bladder and Leakage
Lungs & Breathing
- Sleep apnea
Mental Health
- Generalized anxiety disorder
- Insomnia and Sleep Problems
Neurologic and behavioral
- Depression
- Migraines
Pain
- Back pain
Rheumatologic and pain
- Osteoarthritis
Procedures & services
Most searched procedures
- Annual physical
- Blood test
- Flu shot
- Medicare wellness visit
- Sick visit
- TB test
- Well-woman exam
Preventive and evaluation
- Medication management
- Post-hospital transitional care
Screening and diagnostic testing
- EKG
- Spirometry
Bones & Joints
- Trigger Point Injections
Brain and nerves
- Epley Maneuver
Cancer screening
- Colon Cancer Screening Referral
- Mammogram Referral
Digestive
- Endoscopy
Exams & Consultations
- Pre-Op Clearance Exam
Heart & Circulation
- Blood Pressure Check
- Heart monitor
Heart health
- Cardiac Stress Test Referral
Imaging referral
- Abdominal Ultrasound Referral
Immunizations
- Tetanus shot
Lab tests
- Urinalysis
Lungs & Breathing
- At-Home Sleep Study Order
Metabolic & Weight
- Weight Loss Injections and Medication
Minor procedures
- Ingrown toenail removal
- Suture removal
Office procedures
- Cryotherapy for skin lesions
- Earwax removal
- Incision and drainage of an abscess
- Skin biopsy
Office Procedures
- Skin Tag and Mole Removal
- Vitamin B12 Injections
- Wart Removal
Pain management
- Knee Joint Injection
Preventive & Routine Care
- Smoking cessation counseling
Screenings & Diagnostics
- Bone Density Scan Referral
- Diabetes Screening and A1C Test
Sexual health
- STI Testing
Procedures Most Often Billed to Medicare
8,813 services · 3,113 patients · 25 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Removal of impacted ear wax | Procedure | 69210 |
27 | More often than most peers in Internal Medicine |
| Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report | Treatment | 93000 |
443 | More than most peers in Internal Medicine |
| Injection of drug or substance under skin or into muscle | Treatment | 96372 |
124 | More often than most peers in Internal Medicine |
| Injection, denosumab, 1 mg | Drug given | J0897 |
3,661 | More often than most peers in Internal Medicine |
| Injection, vitamin b-12 cyanocobalamin, up to 1000 mcg | Drug given | J3420 |
61 | As often as other peers in Internal Medicine |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
1,485 | More than most peers in Internal Medicine |
| Urinalysis, manual test | Lab test | 81002 |
451 | More than most peers in Internal Medicine |
| Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes | Office visit | 99309 |
442 | More often than most peers in Internal Medicine |
| Blood glucose (sugar) test performed by hand-held instrument | Lab test | 82962 |
437 | More than most peers in Internal Medicine |
| Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit | Billing code | G0439 |
424 | More than most 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 1
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 5
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
More connections — 24 related providers in 3 groups
Trained at Tufts University School of Medicine 8
Other providers in the same specialty who trained at the same institution.
Class of 1996 at Tufts University School of Medicine 8
Providers who graduated from the same medical school in the same year.
Also performs Removal of impacted ear wax 8
Providers in CT who bill this service to Medicare most often.
Common questions
What does John J. Hennessey specialize in?
John J. Hennessey is an internist in Gales Ferry, CT. That is the designation recorded for this NPI in the federal registry, where it is listed as “Internal Medicine”.
NPI registry
Where is John J. Hennessey located?
John J. Hennessey is listed at 1527 Route 12 Suite 1, Gales Ferry, CT 06335. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is John J. Hennessey's phone number?
The number on file is (860) 464-7253. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is John J. Hennessey's NPI number?
John J. Hennessey's National Provider Identifier is 1215916564. 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
Where did John J. Hennessey train?
John J. Hennessey attended Tufts University School of Medicine, graduating in 1996. This comes from the CMS National Downloadable File.
CMS public data
How long has John J. Hennessey been practicing?
John J. Hennessey has 30 years experience. Calculated from a graduation year of 1996, reported in the CMS National Downloadable File.
CMS public data
What does John J. Hennessey do most often?
According to Medicare billing data, John J. Hennessey performs procedures including removal of impacted ear wax; 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 J. Hennessey confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by John J. Hennessey. If this is you, claiming it is free.
Guide.md
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.