Q28.9 — Congenital malformation of circulatory system, unspecified
Is Q28.9 billable?
Yes, but Q28.9 is an unspecified code. Q28.9 is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, Q28.9 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 Q28.9 — the more specific alternatives are listed below.
Q28.9 at a glance
| Code | Q28.9 |
|---|---|
| Description | Congenital malformation of circulatory system, unspecified |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does Q28.9 group to?
Q28.9 sits in MDC 05 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.
- 299Peripheral Vascular Disorders with MCCmedical
- 300Peripheral Vascular Disorders with CCmedical
- 301Peripheral Vascular Disorders without CC/MCCmedical
As a secondary diagnosis, Q28.9 is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG.
How is Q28.9 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to Q28.9. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Agenesis › circulatory system, part NOS
- Anomaly, anomalous › circulatory system (congenital) (unspecified type)
- Circulation › embryonic
- Circulation › heart, incomplete
- Deformity › cardiovascular system, congenital
- Embryonic › circulation
- Embryonic › heart
- Malformation › circulatory system (congenital)
- Circulation › defective › congenital
- Defect, defective › circulation › congenital
- Defect, defective › circulation › newborn
- Disease, diseased › cardiovascular › congenital
Excludes1 — never code together — inherited from Q28
The conditions below can never be reported together with Q28.9 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Excludes2 — not included here — inherited from Chapter 17
The conditions below are not part of Q28.9, but a patient may have both at the same time. When documentation supports it, Q28.9 and the excluded code may both be reported.
- inborn errors of metabolism (E70-E88)
Excludes2 — not included here — inherited from Q28
The conditions below are not part of Q28.9, but a patient may have both at the same time. When documentation supports it, Q28.9 and the excluded code may both be reported.
How long has Q28.9 existed?
Q28.9 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.