Q99.818 — Other Usher syndrome
Is Q99.818 billable?
Yes — Q99.818 is billable for FY2027. Q99.818 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. Q99.818 may be submitted for encounters from October 1, 2026 through September 30, 2027.
Q99.818 at a glance
| Code | Q99.818 |
|---|---|
| Description | Other Usher syndrome |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does Q99.818 group to?
Q99.818 sits in MDC 08 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.
- 564Other Musculoskeletal System and Connective Tissue Diagnoses with MCCmedical
- 565Other Musculoskeletal System and Connective Tissue Diagnoses with CCmedical
- 566Other Musculoskeletal System and Connective Tissue Diagnoses without CC/MCCmedical
As a secondary diagnosis, Q99.818 is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG.
How is Q99.818 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to Q99.818. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Syndrome › usher › specified NEC
- Syndrome › usher › type 4
Inclusion terms
Alternative wording in documentation that is classified to Q99.818.
- Usher syndrome, type 4
Use additional code — inherited from Q99.81
Report an additional code alongside Q99.818 to fully describe the condition. Q99.818 is sequenced first.
- code to identify any auditory and visual manifestations
Excludes2 — not included here — inherited from Chapter 17
The conditions below are not part of Q99.818, but a patient may have both at the same time. When documentation supports it, Q99.818 and the excluded code may both be reported.
- inborn errors of metabolism (E70-E88)
Excludes2 — not included here — inherited from Q90-Q99
The conditions below are not part of Q99.818, but a patient may have both at the same time. When documentation supports it, Q99.818 and the excluded code may both be reported.
- mitochondrial metabolic disorders (E88.4-)
How long has Q99.818 existed?
Q99.818 first appears in FY2026.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.