Is Q91.3 a billable ICD-10 code?

Yes. Q91.3 (Trisomy 18, unspecified) is billable and can be used for insurance claims. Always verify payer-specific requirements.

Q91.3 ✓ Billable

Trisomy 18, unspecified

Q: What is ICD-10 code Q91.3?

ICD-10-CM code Q91.3 stands for "Trisomy 18, unspecified". It is a billable code in the Congenital Malformations, Deformations and Chromosomal Abnormalities chapter, effective FY2026 (Oct 1, 2025 – Sep 30, 2026).

ICD-10-CM · FY2026 · Congenital Malformations, Deformations and Chromosomal Abnormalities

Code

Q91.3

System

ICD-10-CM

Billable

Yes — valid for submission

Effective

FY2026

Chapter

Congenital Malformations, Deformations and Chromosomal Abnormalities

Source

CMS / CDC NCHS

⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.

Frequently asked questions

What is ICD-10 code Q91.3?

ICD-10-CM code Q91.3 represents Trisomy 18, unspecified. It is a billable diagnosis code in the Congenital Malformations, Deformations and Chromosomal Abnormalities chapter, effective October 1, 2025 – September 30, 2026.

Is Q91.3 billable?

Yes. Q91.3 is a valid billable ICD-10-CM code for insurance claims and clinical documentation.

What chapter is Q91.3 in?

Q91.3 belongs to the Congenital Malformations, Deformations and Chromosomal Abnormalities chapter (Q00–Q99) of ICD-10-CM.

Related codes in the Q91 category

Q91 Trisomy 18 and Trisomy 13 Non-billable Q91.0 Trisomy 18, nonmosaicism (meiotic nondisjunction) Billable Q91.1 Trisomy 18, mosaicism (mitotic nondisjunction) Billable Q91.2 Trisomy 18, translocation Billable Q91.4 Trisomy 13, nonmosaicism (meiotic nondisjunction) Billable Q91.5 Trisomy 13, mosaicism (mitotic nondisjunction) Billable Q91.6 Trisomy 13, translocation Billable Q91.7 Trisomy 13, unspecified Billable

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