2026 ICD-10-CM Diagnosis Code S09.392AOther specified injury of left middle and inner ear, initial encounter
S09.392A is a billable ICD-10-CM diagnosis code for other specified injury of left middle and inner ear, initial encounter. The 7th character A marks it as an initial encounter code, used while the patient is receiving active treatment. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 154 through 156, 963 through 965. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified injury.
Code Identity
Code Classification
Coding GuidelinesGuidance
The appropriate 7th character is to be added to each code from block Other and unspecified injuries of head (S09). Use the following options for the applicable episode of care:
- A - initial encounter
- D - subsequent encounter
- S - sequela
Source: ICD-10-CM Official Guidelines for Coding and Reporting, FY 2026, published by CMS and the National Center for Health Statistics.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Ear Disorders
Your ear has three main parts: outer, middle and inner. You use all of them in hearing. Sound waves come in through your outer ear. They reach your middle ear, where they make your eardrum vibrate. The vibrations are transmitted through three tiny bones, called ossicles, in your middle ear.
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Convert S09.392A to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About S09.392AOverview
Is S09.392A (Other specified injury of left middle and inner ear) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report other specified injury of left middle and inner ear, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character A in S09.392A mean?
The final character A marks the initial encounter: use it while the patient is receiving active treatment for other specified injury of left middle and inner ear, such as an emergency visit or first evaluation.
What MS-DRG does S09.392A group to?
When other specified injury of left middle and inner ear, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 154, 155, 156, 963, 964, 965, with relative weights from 0.6911 to 2.7338 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of S09.392A?
Under the General Equivalence Mappings, other specified injury of left middle and inner ear, initial encounter converts to ICD-9-CM 872.62 (open wound of ossicles), 872.63 (open wnd eustachian tube), and 872.64 (open wound of cochlea). The mapping is approximate, so confirm the match fits the documentation.
Footnotes
[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.
