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ICD-10-CM 2027

ICD-10 code for chorion cyst

O41.8X

Other specified disorders of amniotic fluid and membranes

Header — needs a more specific code

From the official ICD-10-CM alphabetic index entry “Cyst (colloid) (mucous) (simple) (retention) › chorion”. Page updated September 29, 2026.

About coding chorion cyst

The ICD-10-CM code for chorion cyst is O41.8X (Other specified disorders of amniotic fluid and membranes).

Codes in this range require a 7th character: 0 for not applicable or unspecified, 1 for fetus 1, 2 for fetus 2, 3 for fetus 3, 4 for fetus 4, 5 for fetus 5 and 1 more. Use placeholder "X" characters to fill any empty positions before the 7th character.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Common questions about chorion cyst ICD-10 codes

What is the ICD-10 code for chorion cyst?

O41.8X — Other specified disorders of amniotic fluid and membranes (a header code; report a more specific subcode).

Is O41.8X billable?

No. O41.8X is a header code. Report one of its more specific subcodes instead.