Q43.9 — Congenital malformation of intestine, unspecified

BillableUnspecifiedCC

Is Q43.9 billable?

Yes, but Q43.9 is an unspecified code. Q43.9 is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, Q43.9 is an unspecified or catch-all code. Payers apply additional scrutiny to unspecified codes and many deny them when the medical record supports a more specific option, so check the documentation before selecting Q43.9 — the more specific alternatives are listed below.

More specific alternatives

Q43.9 at a glance

Code	Q43.9
Description	Congenital malformation of intestine, unspecified
Billable	Yes
Code set	ICD-10-CM FY2027
Valid for encounters	October 1, 2026 – September 30, 2027

Which MS-DRGs does Q43.9 group to?

Q43.9 sits in MDC 06 and helps define the logic of 3 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.

393Other Digestive System Diagnoses with MCCmedical
394Other Digestive System Diagnoses with CCmedical
395Other Digestive System Diagnoses without CC/MCCmedical

As a secondary diagnosis, Q43.9 is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG.

How is Q43.9 listed in the Alphabetic Index?

These are the routes through the Alphabetic Index that lead to Q43.9. They show the wording a clinician may have documented, which often differs from the Tabular description.

Anomaly, anomalous › anus (congenital) (unspecified type)
Anomaly, anomalous › cecum (congenital) (unspecified type)
Anomaly, anomalous › colon (congenital) (unspecified type)
Anomaly, anomalous › duodenum (congenital) (unspecified type)
Anomaly, anomalous › ileocecal (congenital) (unspecified type)
Anomaly, anomalous › ileum (congenital) (unspecified type)
Anomaly, anomalous › intestine (congenital) (unspecified type)
Anomaly, anomalous › rectum (congenital) (unspecified type)
Anomaly, anomalous › sigmoid (congenital) (unspecified type)
Deformity › cecum
Deformity › colon
Deformity › duodenum

Excludes2 — not included here — inherited from Chapter 17

The conditions below are not part of Q43.9, but a patient may have both at the same time. When documentation supports it, Q43.9 and the excluded code may both be reported.

inborn errors of metabolism (E70-E88)

How long has Q43.9 existed?

Q43.9 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.

Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.