Q89.4 – Conjoined twins
ICD-10-CM 2027 diagnosis code · Other congenital malformations
ICD-10-CM code
Q89.4
- Code
Q89.4(claims format:Q894)- Description
- Conjoined twins
- Billable
- Yes – valid for HIPAA-covered transactions
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 17. Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders (Q00-QA1)
- Block
- Q80-Q89 Other congenital malformations
- Parent codes
- Q89
Notes for Q89.4
Applicable to:
- Craniopagus
- Dicephaly
- Pygopagus
- Thoracopagus
Index terms for Q89.4
Entries in the ICD-10-CM alphabetic index that lead to this code:
Related codes in Q89
- Q89.0 – Congenital absence and malformations of spleenHeader
- Q89.1 – Congenital malformations of adrenal glandBillable
- Q89.2 – Congenital malformations of other endocrine glandsBillable
- Q89.3 – Situs inversusBillable
- Q89.7 – Multiple congenital malformations, not elsewhere classifiedBillable
- Q89.8 – Other specified congenital malformationsHeader
- Q89.9 – Congenital malformation, unspecifiedBillable
Frequently asked questions
What is ICD-10 code Q89.4?
Q89.4 is the ICD-10-CM code for conjoined twins, in the block Q80-Q89 (Other congenital malformations).
Is Q89.4 a billable code?
Yes. Q89.4 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
What category does Q89.4 belong to?
It belongs to category Q89 – Other congenital malformations, not elsewhere classified.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.