ICD-10 Code S42.494G: Nondisplaced distal humerus fracture

Key takeaways

S42.494G describes other nondisplaced fracture of the lower end of the right humerus, subsequent encounter for fracture with delayed healing.

The 7th character G signals delayed healing, which is distinct from nonunion (K) and malunion (P). Each finding calls for different clinical documentation.

This is a fully billable ICD-10-CM code, valid for HIPAA-covered transactions in the current fiscal year. The parent 6-character code S42.494 is not billable on its own.

Practice management software like Pabau submits S42.494G claims through its Claim.MD clearinghouse integration and tracks the status of each one.

ICD-10 Code S42.494G is a billable code for a nondisplaced fracture of the lower end of the right humerus. It applies at a follow-up visit where healing is running behind schedule. The 7th character G is the part that carries that delayed-healing finding.

This reference covers the official description, the billable status, and the full code hierarchy. It also explains how delayed healing differs from nonunion and malunion. Then it lists the sibling codes, the CPT codes billed alongside S42.494G, and the documentation a record needs.

ICD-10 Code S42.494G: Quick reference

The table below gives coders the core facts about ICD-10 Code S42.494G at a glance, mirroring the format used by the CDC/NCHS ICD-10-CM web tool.

What the 7th character G means in ICD-10 fracture coding

The 7th character carries two facts on a fracture code. It records the phase of care, and on a subsequent encounter it records how the fracture is healing. Per the CMS ICD-10-CM official guidance, it is required on every code in this family.

Laterality is not part of that job. The 6th character already fixes the side, which is why every S42.494 code describes the right humerus. Picking the wrong 7th character means submitting the correct 6-character code for the wrong clinical scenario.

Seven 7th characters are valid for S42.494, and the table below lists all of them. Which one applies depends on what the treating clinician documents at the encounter.

Billable status and HIPAA compliance for ICD-10 Code S42.494G

S42.494G is a fully billable, 7-character ICD-10-CM diagnosis code. It is valid for HIPAA-covered electronic transactions in the FY 2026 code set.

Practice management software like Pabau connects orthopedic and physical therapy practices to the Claim.MD clearinghouse integration. Claim.MD runs payer edits on a claim before it reaches the insurer, which catches format and eligibility problems early.

Inside Pabau, the orthopedic claims management workflow pulls the codes already sitting on the patient record into a pre-filled claim. The coder still chooses the 7th character, and the clearinghouse edits then run before the claim is filed.

Two points coders should note before submitting:

• The parent code S42.494 is not billable on its own. A claim submitted with only six characters will be rejected. The 7th character is mandatory for any encounter under this code family.
• HIPAA validity is tied to the active fiscal year. The National Center for Health Statistics (NCHS) reviews the code set every year. Verify S42.494G against the current tabular list for any encounter after October 1, 2026.

Code hierarchy: where S42.494G sits in ICD-10-CM

The parent code path shows coders which related diagnoses sit nearby. That helps when several injury codes land on the same claim, as the ICD-10 code hierarchy for trauma diagnoses shows. The full hierarchy for S42.494G is:

Clinical context: nondisplaced fracture of the distal humerus

The distal humerus is the lower third of the upper arm bone. It meets the radius and ulna to form the elbow joint. A nondisplaced fracture means the bone has cracked but the fragments have not shifted out of alignment.

Displacement is its own coding axis. Displaced and nondisplaced fractures at the same site carry different codes, so the treating clinician has to state the displacement status in the note.

Common mechanisms include direct impact to the elbow, outstretched-arm falls (FOOSH injuries), and sports contact. Older patients with lower bone density are overrepresented in nondisplaced distal humerus presentations.

The usual physical therapy documentation requirements apply once therapy joins the follow-up care plan. Those encounters generate their own CPT codes, billed alongside S42.494G.

• Nondisplaced: fracture line present; bone fragments remain in anatomical position
• Displaced: fragments have shifted; coded separately under S42.491 (right) series
• “Other” qualifier: covers fractures not classified elsewhere in S42.4, including fractures of the articular surface NOS at the lower end of the right humerus

Delayed healing vs. nonunion vs. malunion: choosing the right 7th character

Delayed healing (G), nonunion (K), and malunion (P) are three separate clinical findings. All three appear as 7th character options for a subsequent fracture encounter. Using the wrong one puts the claim at odds with the medical record, which is an audit trigger.

Patient compliance in fracture aftercare often shapes the clinician’s view of why healing is behind. Weight-bearing restrictions, splint use, and follow-up attendance all belong in the record. The choice itself comes down to a single question about the note, and it maps onto three codes.

The distinction between G and K is biological potential. With delayed healing, the fracture could still consolidate under continued treatment. With nonunion, that potential is gone without surgical or other procedural intervention.

Coders cannot make that call. It has to come from the treating surgeon’s or physician’s documentation, so query the provider whenever the record is ambiguous. Submitting G where the record describes nonunion is a coding error, and it can surface in a denial management review.

Related and sibling ICD-10 codes for right humerus fractures

The S42.494 family and its neighbors are the codes coders look up alongside S42.494G. The AAPC Codify ICD-10-CM lookup and ICD List both offer sibling navigation for the full S42.4 block.

The table below covers laterality, encounter type, and displacement status for this fracture site. As with any ICD-10-CM diagnosis code reference, confirm laterality and displacement from the operative note or the imaging report. Never take them from the referral.

Coding guidelines and documentation requirements for S42.494G

The ICD-10-CM Official Guidelines for Coding and Reporting govern how subsequent fracture encounter codes are applied. They are maintained by the Centers for Medicare and Medicaid Services (CMS) and the NCHS. The ICD-10-CM coding guidelines on encounter type apply across every trauma code, not just S42.494G.

The most common submission error on this code is a simple one. Someone applies the initial-encounter suffix (A) to a follow-up visit. A grounding in medical billing fundamentals is usually enough to stop it.

Key rules for S42.494G specifically:

• Subsequent encounter, not aftercare Z codes. For fractures, ICD-10-CM instructs coders to use the appropriate 7th character for subsequent encounters rather than an aftercare code (Z47 series). Aftercare Z codes do not apply to fractures.
• Delayed healing must be stated in the record. The provider note or imaging report must explicitly document that healing is delayed or that callus formation is slower than expected. Coder inference alone does not support this code.
• Use additional code for external cause. The tabular list instructs coders to add an external cause code from Chapter 20 for the mechanism of injury, where the record supplies it.
• Applicable to note. S42.494 carries an “Applicable To” note for nondisplaced fractures of the articular surface NOS at the lower end of the right humerus. Confirm the fracture site matches that description before using the code.
• No Excludes1 conflicts. Review the Excludes1 notes at the S42 level to ensure no other code takes priority for this specific fracture pattern.

Common CPT codes used with S42.494G

The codes below are the CPT procedures that most often accompany a subsequent encounter for a nondisplaced distal humerus fracture with delayed healing. The American Medical Association (AMA) maintains the CPT code set and updates it every year. Check the current AMA code set and the CMS Physician Fee Schedule for reimbursement values before you submit.

Practices running physical therapy practice management software should also check that therapy CPT codes are tied to the correct ICD-10 diagnosis at the claim level.

Standard modifier rules still apply when an E/M code goes out with a procedure code for the same encounter. Modifier 25 marks a separately identifiable E/M performed on the same day as a procedure. Practices billing therapy codes should check that their medical claims clearinghouse supports paired ICD-10 and CPT edits at the claim line level.

Pabau’s Claim.MD integration posts electronic remittance advice (ERA/835) files back into the practice. You can see which line items a payer adjusted or denied without reconciling remittances by hand.

How Pabau keeps delayed-healing claims moving

In most orthopedic and physical therapy practices, the note and the claim live in different places. A coder reads the follow-up note, picks the 7th character, then retypes the encounter into a payer portal or a separate billing tool. Claim status then sits somewhere else again.

Pabau keeps the appointment, the treatment note, and the codes already on the patient record in one place. Its Claim.MD integration pulls that record data into a pre-filled claim, submits it, and tracks what the payer does next. The coder still decides whether the note supports G rather than D or K.

The outcome is fewer rekeyed claims and a shorter wait to find out where one stands. When a fracture line is adjusted or denied, the ERA lands against the same record the claim came from. You can correct and resubmit without hunting for the original note.

Send orthopedic and therapy claims from one record

Pabau’s claims management module connects to the Claim.MD clearinghouse, so fracture claims go out from the same record that holds the note. Track claim status and post ERA remittances without switching systems.

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Conclusion

Coding delayed healing well comes down to one habit. Match the 7th character G to what the provider actually wrote, rather than inferring healing status from elapsed time or visit frequency. S42.494G has a narrow clinical definition, and swapping G for D or K is both avoidable and auditable.

Pabau’s claims management software sends fracture claims to the clearinghouse from the same record that holds the note, then tracks what comes back. That cuts the rework a rejected follow-up claim usually creates. Book a demo to see claim tracking and ERA posting on an orthopedic workflow.

Continue your research

Need to understand how clearinghouses validate ICD-10 codes before submission? How Claim.MD clearinghouse works with Pabau explains the real-time payer edit and eligibility verification process.

Dealing with denied fracture claims? Denial codes in medical billing breaks down the most common CARC denial reasons and how to respond to each one.

Billing for physical therapy services alongside fracture follow-up? What is revenue cycle management covers how to structure the billing workflow from encounter to ERA reconciliation.

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