Koban "Police Box"
Your best resource for contacting the police is your nearest "Koban", or police box.
This network of mini police stations is unique to Japan, and they can be found nearby every train station and virtually in every neighborhood throughout the country.
Police officers stationed at koban serve several roles:
Emergency calls can be made from any phone free of charge: Call 110 for police or call 119 for fire and ambulance.
Japan has an advanced medical services infrastructure, and in most urban areas you will be able to find a major hospital or clinic with some ability to communicate with you in English.
Travelers with pre-existing conditions are strongly encouraged to carry copies of any prescriptions, along with enough medicine, if any, for the duration of their stay.
All visitors should also carry proof of medical insurance, either private or public, as well as a list of any medications or substances to which they have a known allergy, along with a notation of their blood type.
In Japan, common over-the-counter drugs are available only at drug stores, most of which have a pharmacist on duty during the business hours.
Many large hotels have access to on-call medical services; some may have an in-house doctor or clinic - inquire at the front desk. If your illness requires hospitalization or other more advanced care, there are facilities around the country prepared to handle the foreign visitors.
Below is a link to a list of such facilities.
Bilingual Hospitals In Japan