S40.84 – External constriction of upper arm
ICD-10-CM 2027 diagnosis code · Injuries to the shoulder and upper arm
- Code
S40.84(claims format:S4084)- Description
- External constriction of upper arm
- Billable
- No – use a more specific code below
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 19. Injury, poisoning and certain other consequences of external causes (S00-T88)
- Block
- S40-S49 Injuries to the shoulder and upper arm
- Parent codes
- S40 › S40.8
Billable codes under S40.84
S40.84 is a header code and cannot be used on claims. Choose the most specific code:
- S40.841 – External constriction of right upper armHeader (more codes below)
- S40.842 – External constriction of left upper armHeader (more codes below)
- S40.849 – External constriction of unspecified upper armHeader (more codes below)
7th character values
Codes in this category need a 7th character to describe the encounter or episode of care (use placeholder X for empty positions).
| Character | Meaning |
|---|---|
A | initial encounter |
D | subsequent encounter |
S | sequela |
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
S40 – Superficial injury of shoulder and upper arm
- The appropriate 7th character is to be added to each code from category S40
Block S40-S49
- injuries of axilla
- injuries of scapular region
Index terms for S40.84
Entries in the ICD-10-CM alphabetic index that lead to this code:
Related codes in S40.8
Frequently asked questions
What is ICD-10 code S40.84?
S40.84 is the ICD-10-CM code for external constriction of upper arm, in the block S40-S49 (Injuries to the shoulder and upper arm).
Is S40.84 a billable code?
No. S40.84 is a header code with more specific child codes; report one of the billable codes listed above.
What category does S40.84 belong to?
It belongs to category S40 – Superficial injury of shoulder and upper arm.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.