T20.412 — Corrosion of unspecified degree of left ear [any part, except ear drum]
Is T20.412 billable?
No — T20.412 is a non-billable header code. T20.412 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 3 billable codes beneath T20.412.
Billable codes under this header
T20.412 at a glance
| Code | T20.412 |
|---|---|
| Description | Corrosion of unspecified degree of left ear [any part, except ear drum] |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
How is T20.412 listed in the Alphabetic Index?
The Alphabetic Index lists these routes under T20.41, the nearest indexed parent of T20.412. Use them to find the family, then select the specific code.
- Corrosion › ear (injury) (acid) (caustic) (chemical) (lime) (external) (internal)
Code first — inherited from T20.4
The underlying condition below must be sequenced before T20.412. T20.412 describes a manifestation and cannot be the principal or first-listed diagnosis.
- (T51-T65) to identify chemical and intent
Use additional code — inherited from Chapter 19
Report an additional code alongside T20.412 to fully describe the condition. T20.412 is sequenced first.
- code to identify any retained foreign body, if applicable (Z18.-)
Use additional code — inherited from T20-T25
Report an additional code alongside T20.412 to fully describe the condition. T20.412 is sequenced first.
Use additional code — inherited from T20.4
Report an additional code alongside T20.412 to fully describe the condition. T20.412 is sequenced first.
- external cause code to identify place (Y92)
Excludes2 — not included here — inherited from Chapter 19
The conditions below are not part of T20.412, but a patient may have both at the same time. When documentation supports it, T20.412 and the excluded code may both be reported.
Excludes2 — not included here — inherited from T20
The conditions below are not part of T20.412, but a patient may have both at the same time. When documentation supports it, T20.412 and the excluded code may both be reported.
Excludes2 — not included here — inherited from T20.41
The conditions below are not part of T20.412, but a patient may have both at the same time. When documentation supports it, T20.412 and the excluded code may both be reported.
- corrosion of ear drum (T28.91-)
What codes fall under T20.412? (3)
How long has T20.412 existed?
T20.412 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.