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

Dr Mary Tilak PC

Organization Obesity Medicine (Internal Medicine) Physician · NPI 1356525133

Dr Mary Tilak PC is an Obesity Medicine (Internal Medicine) Physician in Merrillville, Indiana. Licensed in Indiana. Registered with an NPI since 2007.

Licensed in
IN
In the registry since
2007
What do these letters mean?
PC — Professional corporation
A form of business registration, not a clinical qualification.

See every abbreviation used in this directory →

Practice location Address checks out

209 E 86th Ave
Merrillville, IN 46322-2601
Phone: (219) 922-8051
Fax: (219) 922-8608
Show map & directions

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

Specialties & licences

Obesity Medicine (Internal Medicine) Physician (primary) Taxonomy 207RB0002X · Licence 01054662A (IN)

Record details

NPI number1356525133
Entity typeOrganization (Type 2)
Organization subpartNo
Authorized official Mary Tilak — President · (219) 922-8051
NPI enumeratedDecember 28, 2007
Last updated in NPPESDecember 28, 2007
Mailing address209 East 86th Avenue, Merrillville, IN 46322-2601