Diseases of the nervous sys comp pregnancy, second trimester

This code signifies the presence of a pre-existing or new neurological disorder that is impacting a pregnancy during the second trimester. This includes conditions such as epilepsy, multiple sclerosis, migraines, or peripheral neuropathies, where the neurological disease itself or its management is complicated by the pregnancy.

Apply this code when a pregnant patient in her second trimester is diagnosed with a nervous system disorder that is either exacerbated by the pregnancy or requires specific management due to the pregnancy. Documentation should clearly state the neurological condition and its impact or management during the second trimester of gestation.

• Always sequence this code as a secondary diagnosis, following the code for the specific nervous system condition (e.g., G40.909 for epilepsy).
• Ensure the medical record explicitly states "second trimester" to support the use of this specific trimester-specific code.
• Do not use this code for incidental neurological findings that are not complicated by or complicating the pregnancy.