S40.859A — Superficial foreign body of unspecified upper arm, initial encounter
Is S40.859A billable?
Yes, but S40.859A is an unspecified code. S40.859A is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, S40.859A is an unspecified or catch-all code. Payers apply additional scrutiny to unspecified codes and many deny them when the medical record supports a more specific option, so check the documentation before selecting S40.859A — the more specific alternatives are listed below.
S40.859A at a glance
| Code | S40.859A |
|---|---|
| Description | Superficial foreign body of unspecified 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 S40.859A?
In S40.859A, the 7th character A means initial encounter. The 7th character is required for S40.859A to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
Which MS-DRGs does S40.859A group to?
S40.859A sits in MDC 09 and helps define the logic of 2 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 604Trauma to the Skin, Subcutaneous Tissue and Breast with MCCmedical
- 605Trauma to the Skin, Subcutaneous Tissue and Breast without MCCmedical
How is S40.859A listed in the Alphabetic Index?
The Alphabetic Index lists these routes under S40.85, the nearest indexed parent of S40.859A. Use them to find the family, then select the specific code.
- Foreign body › superficial, without open wound › arm
Use additional code — inherited from Chapter 19
Report an additional code alongside S40.859A to fully describe the condition. S40.859A is sequenced first.
- code to identify any retained foreign body, if applicable (Z18.-)
Excludes2 — not included here — inherited from Chapter 19
The conditions below are not part of S40.859A, but a patient may have both at the same time. When documentation supports it, S40.859A and the excluded code may both be reported.
Excludes2 — not included here — inherited from S40-S49
The conditions below are not part of S40.859A, but a patient may have both at the same time. When documentation supports it, S40.859A and the excluded code may both be reported.
How long has S40.859A existed?
S40.859A 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.