Q99.818 – Other Usher syndrome

ICD-10-CM 2027 diagnosis code · Chromosomal abnormalities, not elsewhere classified

Billable code

ICD-10-CM code Q99.818

Code: Q99.818 (claims format: Q99818)
Description: Other Usher syndrome
Billable: Yes – valid for HIPAA-covered transactions
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 17. Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders (Q00-QA1)
Block: Q90-Q99 Chromosomal abnormalities, not elsewhere classified
Parent codes: Q99 › Q99.8 › Q99.81

Notes for Q99.818

Applicable to:

Usher syndrome, type 4

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

Q99.81 – Usher syndrome

Use additional code:

code to identify any auditory and visual manifestations

Block Q90-Q99

Excludes2 (not included here):

mitochondrial metabolic disorders (E88.4-)

Index terms for Q99.818

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in Q99.81

Q99.811 – Usher syndrome, type 1Billable
Q99.812 – Usher syndrome, type 2Billable
Q99.813 – Usher syndrome, type 3Billable
Q99.819 – Usher syndrome, unspecifiedBillable

Frequently asked questions

What is ICD-10 code Q99.818?

Q99.818 is the ICD-10-CM code for other Usher syndrome, in the block Q90-Q99 (Chromosomal abnormalities, not elsewhere classified).

Is Q99.818 a billable code?

Yes. Q99.818 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does Q99.818 belong to?

It belongs to category Q99 – Other chromosome abnormalities, not elsewhere classified.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.