Is Q89.4 a billable ICD-10-CM code?

Yes. Q89.4 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does Q89.4 sit in the tabular list?

Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0), in the block Other congenital malformations (Q80-Q89).

Q89.4

Q89.4 — Conjoined twins

Billable / specific codeICD-10-CMPOA exempt

Q89.4 is a billable, specific ICD-10-CM code for conjoined twins. It is valid for submission on a claim.

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

Craniopagus
Dicephaly
Pygopagus
Thoracopagus

Risk adjustment

Q89.4 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

How Q89.4 is indexed

Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to Q89.4.

Conjoined twins
Craniopagus
Dicephalus, dicephaly
Epignathus
Ischiopagus
Janiceps
Pygopagus
Siamese twin
Sternopagus
Syncephalus
Thoracopagus
Xiphopagus

Related codes at this level

Codes that share Q89. If Q89.4 is not quite right, the correct code is usually one of these.

Questions about Q89.4

Is Q89.4 a billable ICD-10-CM code?: Yes. Q89.4 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does Q89.4 sit in the tabular list?: Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0), in the block Other congenital malformations (Q80-Q89).