Q43.9
Congenital malformation of intestine, unspecified
Q43.9 (also written Q439) is a billable ICD-10-CM diagnosis code for congenital malformation of intestine, unspecified. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 10 codes in category Q43 (Other congenital malformations of intestine). The Alphabetic Index lists it under 21 entries. Its coding notes include 1 Excludes2 entry.
Guidelines tip
From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.
Chapter 17 codes can be used for life. Manifestations that are an inherent part of a specifically coded anomaly are not coded separately. A corrected malformation is reported with a personal history code.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (1 note)
- inborn errors of metabolism (E70-E88)
Care settings
How CMS programs treat this code. These are CMS claim edits and list entries, not coverage or eligibility rules.
Hospital CC
Counts as a complication or comorbidity (CC) when reported as a secondary diagnosis on an inpatient claim. It does not count when the principal diagnosis is one of the 21 codes in its exclusion list. Some MS-DRGs also ignore a CC or MCC that defines the DRG.
Source: CMS MS-DRG Definitions Manual v44, effective October 1, 2026, Appendix CNotes
Also from chapter/block level (1 note)
- Codes from this chapter are not for use on maternal records
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 21 entries
- Anomaly, anomalous (congenital) (unspecified type), anus
- Anomaly, anomalous (congenital) (unspecified type), cecum
- Anomaly, anomalous (congenital) (unspecified type), colon
- Anomaly, anomalous (congenital) (unspecified type), digestive organ (s) or tract, lower
- Anomaly, anomalous (congenital) (unspecified type), duodenum
- Anomaly, anomalous (congenital) (unspecified type), ileocecal (coil) (valve)
- Anomaly, anomalous (congenital) (unspecified type), ileum
- Anomaly, anomalous (congenital) (unspecified type), intestine (large) (small)
- Anomaly, anomalous (congenital) (unspecified type), rectum
- Anomaly, anomalous (congenital) (unspecified type), sigmoid (flexure)
- Deformity, anus (acquired), congenital
- Deformity, cecum (congenital)
Show 9 more
- Deformity, colon (congenital)
- Deformity, duodenum (congenital)
- Deformity, ileocecal (coil) (valve) (acquired), congenital
- Deformity, ileum (congenital)
- Deformity, intestine (large) (small) (congenital) NOS
- Deformity, rectum (congenital)
- Deformity, sigmoid (flexure) (congenital)
- Maldevelopment, colon
- Malformation (congenital), intestine