Tamakoshi Sewa Samiti (TSS) is the founding organization of Tamakoshi Hospital (previously registered as Tamakoshi Co-operative Hospital). In 1986 (38 years ago), TSS established a tiny clinic in Manthali village (now Manthali Municipality) and made provision of one clinic assistant trained just for 3 months. Fewer medicines (especially for fever and wounded dressing) were available in the clinic. During that time, no any health institution (neither private nor government) was existed in Manthali valley. There was one government health post in Ramechhap village (old district headquarters), which is 15 kms. away from Manthali and the only means of transportation was for 4 hours walking distance during that period. In such situation, TSS clinic was considered to be very significant despite small in size, as no alternative health center was existed in Manthali. At present, there is a 50-bed government district hospital in Ramechhap Municipality (previously Ramechhap village) and a 15-bed Manthali Hospital in the district headquarters.

TSS gradually expanded the level of health services in the clinic and also made provision of more health workers. In 2000, the small clinic converted into a 10-bed hospital with the provision of one part-time MBBS medical doctor and the hospital was fully operated under TSS health program. Eventually in 7th June 2007, the TSS health clinic was formally registered in the name of "Tamakoshi Co-operative Hospital" as a social health institution. The original name of the hospital has been changed into Tamakoshi Hospital. The hospital has also obtained an approval from Central Development Regional Directorate, Ministry of Health & Population.  Manthali Saving & Credit Co-operative Society Ltd. (which was also promoted by TSS in 1998) was also involved in the establishment of the Tamakoshi Co-operative Hospital. Thus, there is close relationship between the hospital, TSS and Manthali Co-operatives. The hospital has been upgraded into 25-bed hospital from April 2017.

Before formal registration of the hospital, World Neighbors USA had greatly supported for many years to run the hospital under TSS's health project. The hospital is now self-sustained from its internal service income since FY 2013/14. Before that, Manthali Co-operatives Society had supported money to cover partial medical staff expense. TSS is providing its whole building with free-of-cost to run the hospital.

Since April 2019, Tamakoshi Hospital has been also affiliated with the government Health Insurance Board and providing free services (including medicines) to the insured members and their families under the government scheme.

For more information, please visit to above website of the hospital.