Abstract:Objective：To inspect the coding status of the thyroid surgery department in a certain grade A tertiary hospital，analyze the causes of coding errors，and enhance the coding quality. Methods：A total of 405 data from the first pages of thyroid surgery medical records in 2022 of a certain grade A tertiary hospital were randomly selected to verify the disease and surgical coding，analyze the types of coding errors，explore the causes of errors in error-prone cases，indicate the correct search path for coding，and discussion the coding methods of thyroid diseases and surgical classifications. Results：A total of 405 cases of thyroid surgery were sampled，with 59 cases of disease errors and an error rate of 14.57%. There were 71 surgical errors，with an error rate of 17.53%. The Common errors in the classification of thyroid diseases are morphological coding errors for thyroid cancer，multiple thyroid nodules are miscoded as thyroid nodules，cervical lymph node metastasis is wrongly coded，and retrosternal goiter is coded incorrectly. The common errors in the classification of thyroid surgery included incorrect scope of thyroidectomy，incorrect coding of retrosternal thyroidectomy，incorrect endoscopic thyroidectomy，and incorrect coding of cervical lymph node dissection. Conclusion：Coders should fully grasp the classification rules of thyroid diseases and surgical coding，possess the necessary clinical knowledge，strengthen communication with clinical staff，standardize clinical writing，and achieve correct coding. Information technology can also be used to improve coding quality by establishing quality control rules.