Q83.9 — Congenital malformation of breast, unspecified
Is Q83.9 billable?
Yes, but Q83.9 is an unspecified code. Q83.9 is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, Q83.9 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 Q83.9 — the more specific alternatives are listed below.
Q83.9 at a glance
| Code | Q83.9 |
|---|---|
| Description | Congenital malformation of breast, unspecified |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does Q83.9 group to?
Q83.9 sits in MDC 09 and helps define the logic of 2 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 600Non-Malignant Breast Disorders with CC/MCCmedical
- 601Non-Malignant Breast Disorders without CC/MCCmedical
How is Q83.9 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to Q83.9. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Anomaly, anomalous › breast (congenital) (unspecified type)
- Anomaly, anomalous › nipple (congenital) (unspecified type)
- Deformity › nipple
- Malformation › breast (congenital)
- Deformity › breast › congenital
Excludes2 — not included here — inherited from Chapter 17
The conditions below are not part of Q83.9, but a patient may have both at the same time. When documentation supports it, Q83.9 and the excluded code may both be reported.
- inborn errors of metabolism (E70-E88)
Excludes2 — not included here — inherited from Q83
The conditions below are not part of Q83.9, but a patient may have both at the same time. When documentation supports it, Q83.9 and the excluded code may both be reported.
How long has Q83.9 existed?
Q83.9 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.