T24.4 — Corrosion of unspecified degree of lower limb, except ankle and foot
Not billable
Is T24.4 billable?
No — T24.4 is a non-billable header code. T24.4 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 45 billable codes beneath T24.4.
Billable codes under this header
- T24.401ACorrosion of unspecified degree of unspecified site of right lower limb, except ankle and foot, initial encounter
- T24.401DCorrosion of unspecified degree of unspecified site of right lower limb, except ankle and foot, subsequent encounter
- T24.401SCorrosion of unspecified degree of unspecified site of right lower limb, except ankle and foot, sequela
- T24.402ACorrosion of unspecified degree of unspecified site of left lower limb, except ankle and foot, initial encounter
- T24.402DCorrosion of unspecified degree of unspecified site of left lower limb, except ankle and foot, subsequent encounter
- T24.402SCorrosion of unspecified degree of unspecified site of left lower limb, except ankle and foot, sequela
- T24.409ACorrosion of unspecified degree of unspecified site of unspecified lower limb, except ankle and foot, initial encounter
- T24.409DCorrosion of unspecified degree of unspecified site of unspecified lower limb, except ankle and foot, subsequent encounter
- T24.409SCorrosion of unspecified degree of unspecified site of unspecified lower limb, except ankle and foot, sequela
- T24.411ACorrosion of unspecified degree of right thigh, initial encounter
- T24.411DCorrosion of unspecified degree of right thigh, subsequent encounter
- T24.411SCorrosion of unspecified degree of right thigh, sequela
- T24.412ACorrosion of unspecified degree of left thigh, initial encounter
- T24.412DCorrosion of unspecified degree of left thigh, subsequent encounter
- T24.412SCorrosion of unspecified degree of left thigh, sequela
- T24.419ACorrosion of unspecified degree of unspecified thigh, initial encounter
- T24.419DCorrosion of unspecified degree of unspecified thigh, subsequent encounter
- T24.419SCorrosion of unspecified degree of unspecified thigh, sequela
- T24.421ACorrosion of unspecified degree of right knee, initial encounter
- T24.421DCorrosion of unspecified degree of right knee, subsequent encounter
- T24.421SCorrosion of unspecified degree of right knee, sequela
- T24.422ACorrosion of unspecified degree of left knee, initial encounter
- T24.422DCorrosion of unspecified degree of left knee, subsequent encounter
- T24.422SCorrosion of unspecified degree of left knee, sequela
- T24.429ACorrosion of unspecified degree of unspecified knee, initial encounter
- T24.429DCorrosion of unspecified degree of unspecified knee, subsequent encounter
- T24.429SCorrosion of unspecified degree of unspecified knee, sequela
- T24.431ACorrosion of unspecified degree of right lower leg, initial encounter
- T24.431DCorrosion of unspecified degree of right lower leg, subsequent encounter
- T24.431SCorrosion of unspecified degree of right lower leg, sequela
- T24.432ACorrosion of unspecified degree of left lower leg, initial encounter
- T24.432DCorrosion of unspecified degree of left lower leg, subsequent encounter
- T24.432SCorrosion of unspecified degree of left lower leg, sequela
- T24.439ACorrosion of unspecified degree of unspecified lower leg, initial encounter
- T24.439DCorrosion of unspecified degree of unspecified lower leg, subsequent encounter
- T24.439SCorrosion of unspecified degree of unspecified lower leg, sequela
- T24.491ACorrosion of unspecified degree of multiple sites of right lower limb, except ankle and foot, initial encounter
- T24.491DCorrosion of unspecified degree of multiple sites of right lower limb, except ankle and foot, subsequent encounter
- T24.491SCorrosion of unspecified degree of multiple sites of right lower limb, except ankle and foot, sequela
- T24.492ACorrosion of unspecified degree of multiple sites of left lower limb, except ankle and foot, initial encounter
- T24.492DCorrosion of unspecified degree of multiple sites of left lower limb, except ankle and foot, subsequent encounter
- T24.492SCorrosion of unspecified degree of multiple sites of left lower limb, except ankle and foot, sequela
- T24.499ACorrosion of unspecified degree of multiple sites of unspecified lower limb, except ankle and foot, initial encounter
- T24.499DCorrosion of unspecified degree of multiple sites of unspecified lower limb, except ankle and foot, subsequent encounter
- T24.499SCorrosion of unspecified degree of multiple sites of unspecified lower limb, except ankle and foot, sequela
T24.4 at a glance
| Code | T24.4 |
|---|---|
| Description | Corrosion of unspecified degree of lower limb, except ankle and foot |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Code first
The underlying condition below must be sequenced before T24.4. T24.4 describes a manifestation and cannot be the principal or first-listed diagnosis.
- (T51-T65) to identify chemical and intent
Use additional code
Report an additional code alongside T24.4 to fully describe the condition. T24.4 is sequenced first.
- external cause code to identify place (Y92)
Use additional code — inherited from Chapter 19
Report an additional code alongside T24.4 to fully describe the condition. T24.4 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 T24.4 to fully describe the condition. T24.4 is sequenced first.
Excludes2 — not included here — inherited from Chapter 19
The conditions below are not part of T24.4, but a patient may have both at the same time. When documentation supports it, T24.4 and the excluded code may both be reported.
Excludes2 — not included here — inherited from T24
The conditions below are not part of T24.4, but a patient may have both at the same time. When documentation supports it, T24.4 and the excluded code may both be reported.
What codes fall under T24.4? (5)
- T24.40Corrosion of unspecified degree of unspecified site of lower limb, except ankle and footnot billable
- T24.41Corrosion of unspecified degree of thighnot billable
- T24.42Corrosion of unspecified degree of kneenot billable
- T24.43Corrosion of unspecified degree of lower legnot billable
- T24.49Corrosion of unspecified degree of multiple sites of lower limb, except ankle and footnot billable
How long has T24.4 existed?
T24.4 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.
What other codes are in the T24 family? (7)
- T24.0Burn of unspecified degree of lower limb, except ankle and footnot billable
- T24.1Burn of first degree of lower limb, except ankle and footnot billable
- T24.2Burn of second degree of lower limb, except ankle and footnot billable
- T24.3Burn of third degree of lower limb, except ankle and footnot billable
- T24.5Corrosion of first degree of lower limb, except ankle and footnot billable
- T24.6Corrosion of second degree of lower limb, except ankle and footnot billable
- T24.7Corrosion of third degree of lower limb, except ankle and footnot billable