Q07.9 — Congenital malformation of nervous system, unspecified
Is Q07.9 billable?
Yes, but Q07.9 is an unspecified code. Q07.9 is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, Q07.9 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 Q07.9 — the more specific alternatives are listed below.
More specific alternatives
Q07.9 at a glance
| Code | Q07.9 |
|---|---|
| Description | Congenital malformation of nervous system, unspecified |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does Q07.9 group to?
Q07.9 sits in MDC 01 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.
- 091Other Disorders of Nervous System with MCCmedical
- 092Other Disorders of Nervous System with CCmedical
- 093Other Disorders of Nervous System without CC/MCCmedical
How is Q07.9 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to Q07.9. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Anomaly, anomalous › gyri (congenital) (unspecified type)
- Anomaly, anomalous › meningeal bands or folds (congenital) (unspecified type)
- Anomaly, anomalous › meninges (congenital) (unspecified type)
- Anomaly, anomalous › nerve (congenital) (unspecified type)
- Anomaly, anomalous › nervous system (congenital) (unspecified type)
- Deformity › meninges or membrane
- Deformity › nervous system
- Dysplasia › brain
- Encephalopathy › congenital (acute)
- Lesion › nervous system, congenital (s) (nontraumatic)
- Maldevelopment › brain
- Malformation › dura (congenital)
Inclusion terms
Alternative wording in documentation that is classified to Q07.9.
- Congenital anomaly NOS of nervous system
- Congenital deformity NOS of nervous system
- Congenital disease or lesion NOS of nervous system
Excludes2 — not included here — inherited from Chapter 17
The conditions below are not part of Q07.9, but a patient may have both at the same time. When documentation supports it, Q07.9 and the excluded code may both be reported.
- inborn errors of metabolism (E70-E88)
Excludes2 — not included here — inherited from Q07
The conditions below are not part of Q07.9, but a patient may have both at the same time. When documentation supports it, Q07.9 and the excluded code may both be reported.
How long has Q07.9 existed?
Q07.9 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.