Billable / Specific Code
ICD-10-CM O99.331 is the diagnosis code for Smoking (tobacco) complicating pregnancy, first trimester. This code falls under the section "Other obstetric conditions, not elsewhere classified" 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 O99.331 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, O99.331 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
O99.331 is the ICD-10-CM diagnosis code for "Smoking (tobacco) complicating pregnancy, first trimester". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of O99.331 is O99.33 ("Tobacco use disorder complicating pregnancy, childbirth, and the puerperium"). O99.331 provides a more specific classification within this category.
O99.331 is located in Section O94-O9A — "Other obstetric conditions, not elsewhere classified" within Chapter 15 of the ICD-10-CM Tabular List.
Use O99.331 when the patients documented diagnosis matches "Smoking (tobacco) complicating pregnancy, 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 Smoking (tobacco) complicating pregnancy, first trimester is O99.331.
Yes, O99.331 can be used as a primary diagnosis code since it is billable and specific.
O99.331 is in Chapter 15 of the ICD-10-CM Tabular List.
Yes, O99.331 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.