O26.829 Pregnancy related peripheral neuritis, unspecified trimester

ICD-10-CM Code O26.829: Pregnancy related peripheral neuritis, unspecified trimester

ICD-10-CM code O26.829 represents pregnancy related peripheral neuritis with an unspecified trimester. Public source excerpts establish that peripheral neurological disorders can occur during pregnancy and may be characterized by the specific trimester. Related conditions include peripheral nerve issues like carpal tunnel syndrome. This reference summarizes what the supplied sources establish about this diagnosis concept. 1 3

Plain-language overview

Code O26.829 identifies a diagnosis of pregnancy related peripheral neuritis when the specific trimester is not specified. Public sources establish that peripheral neurological disorders can occur during the three trimesters of pregnancy. 1 3

What this code represents

The official display label for code O26.829 is pregnancy related peripheral neuritis, unspecified trimester. The available sources identify this exact diagnosis concept as distinct from related peripheral neuritis diagnoses specified by trimester. 3

The supplied coding concept list distinguishes the unspecified trimester peripheral neuritis code from separate codes for the first, second, and third trimesters. This establishes that the trimester is an operational characteristic of these pregnancy related peripheral neuritis codes. 3

Clinical context

The literature indicates that a definitive diagnosis of peripheral neurological disorders during pregnancy can be made according to the trimester of pregnancy and the clinical findings. This clinical detail contrasts with the unspecified trimester nature of code O26.829. 1 3

Carpal tunnel syndrome and peripheral facial palsy are examples of minor peripheral neurological disorders in pregnancy. The literature notes that these specific peripheral disorders occur more often in the third trimester due to physiologic changes during pregnancy. 1

Documentation considerations

The literature establishes that a definitive diagnosis of pregnancy related neurological disorders can be made according to the pregnancy trimester, clinical findings, maternal age, and risk factors. These elements represent clinical documentation details associated with such conditions. 1

What the sources add

The clinical literature adds that factors predisposing pregnant women to neuropathies include diabetes, thyroid disorders, and inherent neuropathies such as Charcot-Marie-Tooth disease. This provides clinical context for peripheral neurological conditions during pregnancy. 1

While the coding source provides the exact label for the unspecified trimester code, the clinical literature establishes that peripheral neurological disorders can occur across all three trimesters and arise from specific changes occurring in each trimester. 1 3

Sources

1. Acute Onset Neurological Disorders during Pregnancy: A Literature Review — pmc.ncbi.nlm.nih.gov; accessed 2026-07-25.
2. Pregnancy-related Hand and Wrist Problems — pmc.ncbi.nlm.nih.gov; accessed 2026-07-25.
3. Phecode 646 · ExPRSweb — csg.sph.umich.edu; accessed 2026-07-25.