Billable / Specific Code
ICD-10-CM O41.121 is the diagnosis code for Chorioamnionitis, first trimester. This code falls under the section "Maternal care related to the fetus and amniotic cavity and possible delivery problems" within Chapter 15 — Pregnancy, childbirth and the puerperium (O00-O9A). It is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
Always refer to the official ICD-10-CM Tabular List for complete coding guidelines. Ensure documentation supports the specificity of the code selected. When in doubt, consult a certified medical coder or the latest CMS guidelines.
Understanding where O41.121 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, O41.121 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
O41.121 is the ICD-10-CM diagnosis code for "Chorioamnionitis, first trimester". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of O41.121 is O41.12 ("Chorioamnionitis"). O41.121 provides a more specific classification within this category.
O41.121 is located in Section O30-O48 — "Maternal care related to the fetus and amniotic cavity and possible delivery problems" within Chapter 15 of the ICD-10-CM Tabular List.
Use O41.121 when the patients documented diagnosis matches "Chorioamnionitis, first trimester" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Chorioamnionitis, first trimester is O41.121.
Yes, O41.121 can be used as a primary diagnosis code since it is billable and specific.
O41.121 is in Chapter 15 of the ICD-10-CM Tabular List.
Yes, O41.121 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.