2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Nervous System And Sense Organs 320-389 > Disorders Of The Eye And Adnexa 360-379 > Disorders Of The Orbit 376.* > 2008 ICD-9-CM Diagnosis 376.12 Orbital myositis  On October 1, 2008 the 2009 ICD-9-CM codes came into effect. Therefore, this code may be out of date. The 2009 version of ICD-9-CM 376.12 can be accessed here. A chronic neoplasm-like inflammatory reaction, usually affecting the orbital tissues of both eyes, also known as orbital myositis. 376.12 is a specific code that can be used to specify a diagnosis 376.12 contains 1 index entry View the ICD-9-CM Volume 1 376.* hierarchy ICD9Data's sister site ProcedureCodes.com launches with the 2008/09 CPT® codes - read more on the ICD9Data.com blog. Index entries containing 376.12: Myositis 729.1 orbital, chronic 376.12