S42.399

⚠ Non-billable (Header)

Other fracture of shaft of unspecified humerus

Injury, poisoning and certain other consequences of external causes (S00-T88)

⚠️ This is a category header code — not billable. Use a more specific child code below.

Check This Code

❌ Excludes1

inherited

Rules inherited from parent codes in the hierarchy.

S42

• traumatic amputation of shoulder and upper arm (S48.-)

⚠️ Excludes2

inherited

Rules inherited from parent codes.

S42.3

• physeal fractures of upper end of humerus (S49.0-)
• physeal fractures of lower end of humerus (S49.1-)

S42

• periprosthetic fracture around internal prosthetic shoulder joint (M97.3)

Child Codes (7)

S42.399AOther fracture of shaft of unspecified humerus, initial encounter for closed fracture✓ Billable S42.399BOther fracture of shaft of unspecified humerus, initial encounter for open fracture✓ Billable S42.399DOther fracture of shaft of unspecified humerus, subsequent encounter for fracture with routine healing✓ Billable S42.399GOther fracture of shaft of unspecified humerus, subsequent encounter for fracture with delayed healing✓ Billable S42.399KOther fracture of shaft of unspecified humerus, subsequent encounter for fracture with nonunion✓ Billable S42.399POther fracture of shaft of unspecified humerus, subsequent encounter for fracture with malunion✓ Billable S42.399SOther fracture of shaft of unspecified humerus, sequela✓ Billable

Clinical Description

ICD-10-CM code S42.399 represents other fracture of shaft of unspecified humerus. This code falls under the Injury, poisoning and certain other consequences of external causes (S00-T88) classification. It is a non-billable category header code. A more specific child code from the list below must be used for billing and reimbursement purposes.

This is a 7-character code at the 6th level of specificity. There are 7 more specific child codes under S42.399. Coders should note that S42.399 has 1 Excludes1 restriction(s) — codes that cannot be reported together on the same claim.

Frequently Asked Questions

What is ICD-10 code S42.399?

ICD-10-CM code S42.399 is "Other fracture of shaft of unspecified humerus". It belongs to the category: Injury, poisoning and certain other consequences of external causes (S00-T88).

Is S42.399 a billable ICD-10 code?

No, S42.399 is a non-billable header code. A more specific child code must be used for billing.

What codes are excluded with S42.399?

S42.399 has 1 Excludes1 rule(s). These codes are mutually exclusive and cannot be coded together on the same claim.

Can S42.399 be coded with other codes?

S42.399 has 3 Excludes2 note(s). These conditions can be coded together if both are documented in the patient record.

Related Codes in S42.39

Other codes in the same category that may be relevant for differential coding:

S42.391Other fracture of shaft of right humerus S42.392Other fracture of shaft of left humerus

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Code Information

CodeS42.399

BillableNo — Header code

ParentS42.39

CategoryInjury, poisoning and certain other consequences of external causes (S00-T88)

Excludes11 rule(s)

Excludes23 note(s)

Child codes7

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)