Other specified acquired hypothyroidism

This code signifies forms of acquired hypothyroidism that do not fit into more specific categories like postsurgical, drug-induced, or due to radiation. It represents a deficiency of thyroid hormone production that develops after birth, caused by factors other than those explicitly classified elsewhere. This results in a generalized slowing of metabolic processes.

Use this code for documented cases of acquired hypothyroidism where the etiology is known but not precisely defined by other ICD-9 codes, such as idiopathic acquired hypothyroidism or hypothyroidism secondary to autoimmune conditions not specified as Hashimoto's. Documentation should clearly state "acquired hypothyroidism" and specify an etiology that isn't covered by more specific codes.

• Ensure the documentation specifies "acquired" hypothyroidism; congenital forms are coded differently.
• Avoid using this code if a more specific ICD-9 code for acquired hypothyroidism (e.g., postsurgical, drug-induced) is applicable.
• Always review the medical record for the underlying cause if available, as this may lead to a more precise diagnosis code.