Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Dr. John Massimilian, DO

Individual provider Emergency Medicine Physician · NPI 1598721508

Dr. John Massimilian, DO is an Emergency Medicine Physician in Crown Point, Indiana. Practices as a sole proprietor. Licensed in Illinois and Indiana.

Licensed in
IL, IN
In the registry since
2006
Specialties on file
2
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

1201 S Main St Dept: ED
Crown Point, IN 46307-8481
Phone: (219) 757-6310
Fax: (219) 757-6312
Show map & directions

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

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence 02001829A (IN)
Emergency Medicine Physician Taxonomy 207P00000X (IL)

Record details

NPI number1598721508
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorYes
NPI enumeratedApril 26, 2006
Last updated in NPPESJuly 8, 2007
Mailing address211 Devon Dr, Burr Ridge, IL 60527-8309

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