Other disorders of brain in diseases classified elsewhere (G94)

• Diseases of the nervous system (G00–G99)

  • Other disorders of the nervous system (G89-G99)

    • Other disorders of brain in diseases classified elsewhere (G94)

      • G94 Other disorders of brain in diseases classified elsewhere

Instructional Notations

Code First

Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.

• underlying disease

Type 1 Excludes

A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.

• encephalopathy in congenital syphilis A50.49
• encephalopathy in influenza J09.X9 J10.81 J11.81
• encephalopathy in syphilis A52.19
• hydrocephalus in diseases classified elsewhere G91.4

Clinical Terms

The following clinical terms provide additional context, helping users better understand the clinical background and common associations for each diagnosis listed in this section. Including related terms alongside ICD-10-CM codes supports coders, billers, and healthcare professionals in improving accuracy, enhancing documentation, and facilitating research or patient education.