The shooting occurred shortly before 6:30 p.m. Thursday along the 2000 block of East Birch Street.
Upon arrival, officers discovered an 18-year-old man down inside a home with a gunshot wound to the stomach.
Medics responded and rushed the victim to Temple University Hospital for care.
He is expected to survive.
Officers arrested the younger teen about a block away in the 1900 block of East Birch.