Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.

Dr. John Mirro, MD

Individual provider Gastroenterology Physician · NPI 1689678955

Dr. John Mirro, MD practises Gastroenterology in Merrillville, Indiana. Graduated from Indiana University School of Medicine in 1972, 54 years ago. Practices with The Methodist Hospitals Inc, a 131-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Indiana.

Years since qualifying
54
Trained at
Indiana University School of Medicine
Licensed in
IN
In the registry since
2005
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

101 E 87th Ave Ste 420
Merrillville, IN 46410-7335
Phone: (219) 758-5008
Fax: (219) 758-5009
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 7895 Grand Blvd, Hobart, IN 46342-6665 — (219) 758-5008

Specialties & licences

Gastroenterology Physician (primary) Taxonomy 207RG0100X · Licence 01024382A (IN)

Record details

NPI number1689678955
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 2, 2005
Last updated in NPPESMarch 15, 2023
Certification dateMarch 15, 2023

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyGASTROENTEROLOGY
Also practisesINTERNAL MEDICINE
Medical schoolINDIANA UNIVERSITY SCHOOL OF MEDICINE
Graduated 1972 (54 years in practice)
Group practice The Methodist Hospitals Inc — 131 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Colonoscopy 15 times · 44th percentile
Upper gastrointestinal (GI) endoscopy for acid reflux 1–10 times

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients69
Services billed 73 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at The Methodist Hospitals Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 131 clinicians in the practice; 12 are shown here.

Other providers in Merrillville