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Edit this profileWhere to find Jon J. Ernstoff, M.D.
- Meriden location main office
455 Lewis Ave, Suite 106, Meriden, CT 06451 - Greenfield location
48 Sanderson St Fl 2, Greenfield, MA 01301
About Dr. Ernstoff
Based in Meriden, CT, Jon J. Ernstoff, M.D. is listed in the NPI registry under gastroenterology. Jon is also listed as specializing in internal medicine. Medicare claims data shows Jon provided 28 services to 25 patients. The services billed most often include established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more and new patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more. NPI 1598789653 identifies this record in the national registry.
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
- (203) 886-0036
- Email not available
Practice Locations
455 LEWIS AVE SUITE 106
Meriden, CT 06451
48 Sanderson St Fl 2
Greenfield, MA 01301
Conditions Commonly Evaluated or Treated
Within Gastroenterology 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
- Acid reflux
- Celiac disease
- Crohn's disease
- Hemorrhoids
- IBS
- Swallowing difficulties
- Ulcerative colitis
Biliary and pancreas
Colon and anorectal
Esophagus and swallowing
Functional bowel and motility
Liver
- Ascites
- Autoimmune hepatitis
- Cirrhosis
- Fatty liver disease
- Hemochromatosis
- Hepatitis B
- Hepatitis C
- Portal hypertension
Stomach and duodenum
Bowel & Colon
Digestive Symptoms
Gallbladder & Bile Ducts
Procedures & services
Most searched procedures
Lower endoscopy
Upper endoscopy
Capsule and physiology testing
Diagnostic Testing
Liver procedures
Treatments
Procedures Most Often Billed to Medicare
28 services · 25 patients · 2 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
16 | Less often than most peers in Gastroenterology |
| New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more | Office visit | 99203 |
12 | Less often than most peers in Gastroenterology |
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 gastroenterologists at this location 6
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 3
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 — 18 related providers in 3 groups
Other gastroenterologists in Meriden 2
Same specialty, same city.
Trained at Other 8
Other providers in the same specialty who trained at the same institution.
Class of 1978 at Other 8
Providers who graduated from the same medical school in the same year.
Common questions
What does Jon J. Ernstoff specialize in?
Jon J. Ernstoff is a gastroenterologist in Meriden, CT. That is the designation recorded for this NPI in the federal registry, where it is listed as “Gastroenterology”.
NPI registry
Where is Jon J. Ernstoff located?
Jon J. Ernstoff is listed at 455 Lewis Ave Suite 106, Meriden, CT 06451. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Jon J. Ernstoff's phone number?
The number on file is (203) 886-0036. Contact the office directly to confirm availability and scheduling.
NPI registry
What is the NPI for Jon J. Ernstoff?
Jon J. Ernstoff's National Provider Identifier is 1598789653. 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 Jon J. Ernstoff train?
Jon J. Ernstoff attended Other, graduating in 1978. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Jon J. Ernstoff have?
Jon J. Ernstoff has 48 years experience. Calculated from a graduation year of 1978, reported in the CMS National Downloadable File.
CMS public data
What does Jon J. Ernstoff do most often?
According to Medicare billing data, Jon J. Ernstoff the Medicare record under this individual NPI shows mainly office visits and diagnostic testing. Hospital-based physicians usually have their procedural work billed by the facility rather than under their own number, so this is a floor on their practice, not a description of it. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Jon J. Ernstoff's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Jon J. Ernstoff. If this is you, claiming it is free.
Guide.md
Guide.md listings do not constitute medical advice or an endorsement.