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Q90

Non-billable

Down syndrome

Q90 is the ICD-10-CM code for Down syndrome. It is a non-billable category code — use a more specific child code such as Q90.0 for billing.

Status
Header (non-billable)
Chapter
Q00-Q99
Subcodes
4
Edition
FY2026

Q00-Q99 Congenital malformations, deformations and chromosomal abnormalities

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What this means — in plain language

MedlinePlus · NIH

What is Down syndrome? Down syndrome is a condition in which a person has an extra chromosome or an extra piece of a chromosome. This extra copy changes how a baby's body and brain develop. It can cause both mental and physical challenges during their lifetime. Even though people with Down syndrome might act and look similar, each person has different abilities. What causes Down syndrome? Chromosomes are tiny…

Read more about Down Syndrome at MedlinePlus ↗
Down syndrome ↗

Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.

Use additional code

  • •code(s) to identify any associated degree of intellectual disabilities (F70-F79)

Notes

  • •associated physical condition(s), such as atrioventricular septal defect (Q21.2-)

Conditions mapped to this code

MedlinePlus · NIH
Down Syndrome

Plain-language health-topic references grounded in MedlinePlus (NIH/NLM).

Benefits & assistance programs

Federal & state

Assistance programs whose eligibility maps to this condition's category. Informational only — eligibility is determined by the administering agency.

Frequently asked questions

What is ICD-10 code Q90?
Q90 is the ICD-10-CM code for "Down syndrome". It falls under Q00-Q99 Congenital malformations, deformations and chromosomal abnormalities.
Is Q90 a billable code?
No — Q90 is a non-billable header code. Use a more specific child code (such as Q90.0) for billing.
What are the subcodes of Q90?
Q90 has 4 more specific child codes, including Q90.0, Q90.1, Q90.2.

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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