T22.531A — Corrosion of first degree of right upper arm, initial encounter
Is T22.531A billable?
Yes — T22.531A is billable for FY2027. T22.531A is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. T22.531A may be submitted for encounters from October 1, 2026 through September 30, 2027.
T22.531A at a glance
| Code | T22.531A |
|---|---|
| Description | Corrosion of first degree of right upper arm, initial encounter |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
| 7th character "A" | initial encounter |
What does the 7th character "A" mean in T22.531A?
In T22.531A, the 7th character A means initial encounter. The 7th character is required for T22.531A to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
Which MS-DRGs does T22.531A group to?
T22.531A sits in MDC 22 and helps define the logic of 1 MS-DRG (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 935Non-Extensive Burnsmedical
How is T22.531A listed in the Alphabetic Index?
The Alphabetic Index lists these routes under T22.531, the nearest indexed parent of T22.531A. Use them to find the family, then select the specific code.
- Corrosion › above elbow › right › first degree (injury) (acid) (caustic) (chemical) (lime) (external) (internal)
Code first — inherited from T22.5
The underlying condition below must be sequenced before T22.531A. T22.531A 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 T22.531A to fully describe the condition. T22.531A 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 T22.531A to fully describe the condition. T22.531A is sequenced first.
Use additional code — inherited from T22.5
Report an additional code alongside T22.531A to fully describe the condition. T22.531A 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 T22.531A, but a patient may have both at the same time. When documentation supports it, T22.531A and the excluded code may both be reported.
Excludes2 — not included here — inherited from T22
The conditions below are not part of T22.531A, but a patient may have both at the same time. When documentation supports it, T22.531A and the excluded code may both be reported.
How long has T22.531A existed?
T22.531A 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.