In all recommended medical institutions in Xi'an, namely:

• Central Hospital of Xian (Xian Central Hospital)
• People's Hospital of Shaanxi Province
• No. 2 College Affiliated to Xian Medical University
• Hospital of Xian Medical College

there are departments of endocrinology, where they are engaged in the treatment of endocrine diseases, including diabetes and thyroid diseases. Pay attention to two clinics:

• Hospital of Xian Medical College. Address: Xian, Xincheng District, 98 of Xiwu Road, tel .: +86 (29) 872-757-06
• No. 2 College Affiliated to Xian Medical University. Address: Xian, 157 Xi Wu Lu, tel .: +86 (29) 876-793-23, 876-784-21.

These medical institutions use methods of integrative medicine, combining the knowledge of eastern (ancient) and western (modern) medicine.

If you are interested only in traditional Chinese medicine, consider the Clinic of Traditional Chinese Medicine of Shaanxi Province:

Shaanxi Traditional Chinese Medicine Hospital 陕西 中医医院

2, Xi Hua Gate, North Avenue. 西安市 北 大街 西 华 门 2 号 Tel: 029-8812800

I do not think that the above-mentioned hospitals have Russian-speaking staff, but they may be able to recommend Russian-speaking guides or translators who work with them. You should go directly to medical institutions, send diagnoses there and discuss the treatment plan, as well as options for accommodation, transportation and escort for a Russian speaking guide during your stay in Xi'an.