A 6-year-old patient with acute otitis media is examined in the office; the diagnosis is H66.90. This is an example of the ICD-10-CM Not Otherwise Specified (NOS) convention.
Not Otherwise Specified (NOS) is a subtype of diseases and disorders in medical classification schemes such as the ICD-9, ICD-10, or DSM-IV. When a particular diagnosis was not determined but the symptoms were enough to generate a broad diagnostic, it is usually used to highlight the presence of an ailment.
According to the DSM-IV, for instance, "an illness or disturbance that does not fit the criteria for the specific disorders already addressed is referred to as not otherwise specified (NOS)". The phrase was created as a result of the fact that "it is sometimes difficult for the practitioner doing the diagnostic evaluation to group all of the symptoms that a client is experiencing into one diagnostic category."
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