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ICD-10-CM 2027

ICD-10 code for Janiceps

Q89.4

Conjoined twins

From the official ICD-10-CM alphabetic index entry “Janiceps”. Page updated September 29, 2026.

About coding Janiceps

The ICD-10-CM code for Janiceps is Q89.4 (Conjoined twins).

Within Q89 (other congenital malformations, not elsewhere classified), Q89.4 is specifically for conjoined twins. Related codes cover congenital absence and malformations of spleen (Q89.0), congenital malformations of adrenal gland (Q89.1), congenital malformations of other endocrine glands (Q89.2), Situs inversus (Q89.3), multiple congenital malformations, not elsewhere classified (Q89.7), other specified congenital malformations (Q89.8) and congenital malformation, unspecified (Q89.9).

As a secondary diagnosis it is an MCC (major complication or comorbidity), which can move an inpatient stay into the highest-paying "with MCC" MS-DRG of its family, unless the principal diagnosis excludes it.

In MS-DRG v44.0, it is part of the grouping logic for DRG 393 (Other Digestive System Diagnoses with MCC, relative weight 1.5881), DRG 394 (Other Digestive System Diagnoses with CC, relative weight 0.9228), DRG 395 (Other Digestive System Diagnoses without CC/MCC, relative weight 0.6382), DRG 791 (Prematurity with Major Problems, relative weight 4.1075) and DRG 793 (Full Term Neonate with Major Problems, relative weight 4.2195), in MDC 06 (Diseases and Disorders of the Digestive System) and MDC 15 (Newborns and Other Neonates with Conditions Originating in the Perinatal Period), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

Common questions about Janiceps ICD-10 codes

What is the ICD-10 code for Janiceps?

Q89.4 — Conjoined twins.

Is Q89.4 billable?

Yes. Q89.4 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can Q89.4 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict Q89.4 as a principal diagnosis.

Is Q89.4 a CC or MCC?

Q89.4 is an MCC (major complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.