Non-Billable / Non-Specific Code
ICD-10-CM O21 is the diagnosis code for Excessive vomiting in pregnancy. This code falls under the section "Other maternal disorders predominantly related to pregnancy" within Chapter 15 — Pregnancy, childbirth and the puerperium (O00-O9A). It is a non-billable/non-specific ICD-10-CM code that should not be used for reimbursement. A more specific sub-code is required for billing. 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 O21 sits in the ICD-10-CM classification helps ensure proper coding:
No, O21 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
O21 is the ICD-10-CM diagnosis code for "Excessive vomiting in pregnancy". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
O21 is located in Section O20-O29 — "Other maternal disorders predominantly related to pregnancy" within Chapter 15 of the ICD-10-CM Tabular List.
O21 has 5 sub-code(s) that provide more specific detail: O21.0, O21.1, O21.2, O21.8, O21.9.
Use O21 when the patients documented diagnosis matches "Excessive vomiting in pregnancy" 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 Excessive vomiting in pregnancy is O21.
No, O21 is non-billable. Use a more specific sub-code for primary diagnosis billing.
O21 is in Chapter 15 of the ICD-10-CM Tabular List.
Yes, O21 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.