Non-Billable / Non-Specific Code
ICD-10-CM Q91 is the diagnosis code for Trisomy 18 and Trisomy 13. This code falls under the section "Chromosomal abnormalities, not elsewhere classified" within Chapter 17 — Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0). 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 Q91 sits in the ICD-10-CM classification helps ensure proper coding:
No, Q91 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
Q91 is the ICD-10-CM diagnosis code for "Trisomy 18 and Trisomy 13". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
Q91 is located in Section Q90-Q99 — "Chromosomal abnormalities, not elsewhere classified" within Chapter 17 of the ICD-10-CM Tabular List.
Q91 has 8 sub-code(s) that provide more specific detail: Q91.0, Q91.1, Q91.2, Q91.3, Q91.4 and more.
Use Q91 when the patients documented diagnosis matches "Trisomy 18 and Trisomy 13" 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 Trisomy 18 and Trisomy 13 is Q91.
No, Q91 is non-billable. Use a more specific sub-code for primary diagnosis billing.
Q91 is in Chapter 17 of the ICD-10-CM Tabular List.
Yes, Q91 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.