In Japan, Year-end and New Year holidays are considered as a 'Fushime' which means a critical turning point. On this occasion, many Japanese people make a fresh start, wishing for a happy year. The first three days of the New Year (January 1-3) are usually called 'San-ga-nichi.' Most of the clinics are closed around December 29 to January 3. It would be better to check the opening hours and dates in advance.
Click the site below Kawasaki City Medical Information and contact number of Health and Welfare Bureau.
・Medical Guide
https://www.city.kawasaki.jp/350/page/0000122139.html
Hospitals and Clinics:
https://www.city.kawasaki.jp/350/page/0000040119.html
https://www.city.kawasaki.jp/shisetsu/category/34-9-0-0-0-0-0-0-0-0.html
Health and Welfare Bureau Health Policy Office: Tel044-200-3742
Wishing you a healthy and happy New Year!