R94.121 — Abnormal vestibular function study
Is R94.121 billable?
Yes — R94.121 is billable for FY2027. R94.121 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. R94.121 may be submitted for encounters from October 1, 2026 through September 30, 2027.
R94.121 at a glance
| Code | R94.121 |
|---|---|
| Description | Abnormal vestibular function study |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does R94.121 group to?
R94.121 sits in MDC 03 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.
- 154Other Ear, Nose, Mouth and Throat Diagnoses with MCCmedical
- 155Other Ear, Nose, Mouth and Throat Diagnoses with CCmedical
- 156Other Ear, Nose, Mouth and Throat Diagnoses without CC/MCCmedical
How is R94.121 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to R94.121. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Abnormal, abnormality, abnormalities › function studies › vestibular
Excludes1 — never code together — inherited from R90-R94
The conditions below can never be reported together with R94.121 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- abnormal findings on antenatal screening of mother (O28.-)
- diagnostic abnormal findings classified elsewhere - see Alphabetical Index
Excludes2 — not included here — inherited from Chapter 18
The conditions below are not part of R94.121, but a patient may have both at the same time. When documentation supports it, R94.121 and the excluded code may both be reported.
How long has R94.121 existed?
R94.121 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.