ICD-10-CM Q99.2 is the diagnosis code for Fragile X chromosome. 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 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.
Understanding where Q99.2 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, Q99.2 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
Q99.2 is the ICD-10-CM diagnosis code for "Fragile X chromosome". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of Q99.2 is Q99 ("Other chromosome abnormalities, not elsewhere classified"). Q99.2 provides a more specific classification within this category.
Q99.2 is located in Section Q90-Q99 — "Chromosomal abnormalities, not elsewhere classified" within Chapter 17 of the ICD-10-CM Tabular List.
Use Q99.2 when the patients documented diagnosis matches "Fragile X chromosome" 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 Fragile X chromosome is Q99.2.
Yes, Q99.2 can be used as a primary diagnosis code since it is billable and specific.
Q99.2 is in Chapter 17 of the ICD-10-CM Tabular List.
Yes, Q99.2 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.