Q45.9 — Congenital malformation of digestive system, unspecified
Is Q45.9 billable?
Yes, but Q45.9 is an unspecified code. Q45.9 is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, Q45.9 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 Q45.9 — the more specific alternatives are listed below.
Q45.9 at a glance
| Code | Q45.9 |
|---|---|
| Description | Congenital malformation of digestive system, unspecified |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does Q45.9 group to?
Q45.9 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
How is Q45.9 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to Q45.9. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Anomaly, anomalous › alimentary tract (congenital) (unspecified type)
- Anomaly, anomalous › digestive organor tract (congenital) (unspecified type)
- Anomaly, anomalous › gastrointestinal tract (congenital) (unspecified type)
- Anomaly, anomalous › mesentery (congenital) (unspecified type)
- Deformity › alimentary tract, congenital
- Deformity › digestive organ NOS
- Deformity › gastrointestinal tractNOS
- Malformation › alimentary tract (congenital)
Inclusion terms
Alternative wording in documentation that is classified to Q45.9.
- Congenital anomaly of digestive system
- Congenital deformity of digestive system
Excludes2 — not included here — inherited from Chapter 17
The conditions below are not part of Q45.9, but a patient may have both at the same time. When documentation supports it, Q45.9 and the excluded code may both be reported.
- inborn errors of metabolism (E70-E88)
Excludes2 — not included here — inherited from Q45
The conditions below are not part of Q45.9, but a patient may have both at the same time. When documentation supports it, Q45.9 and the excluded code may both be reported.
How long has Q45.9 existed?
Q45.9 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.