ICD-10 Code S42.332G: Displaced oblique fracture of shaft of humerus

Key takeaways

ICD-10 code S42.332G describes a displaced oblique fracture of the shaft of the humerus, left arm, at a subsequent encounter with delayed healing

The 7th character G is distinct from D for routine healing and K for nonunion. It has to reflect the healing status documented at that visit

Laterality sits in the 5th character position, so the note has to name the left arm before the code can be assigned

Practice management software like Pabau keeps the coded encounter and the claim in one record, so nothing is rekeyed on the way to the payer

ICD-10 code S42.332G is a billable diagnosis code for a displaced oblique fracture of the shaft of the humerus, left arm. The 7th character G narrows it further, to a subsequent encounter where the provider has documented delayed healing. It is valid for the 2026 fiscal year, effective October 1, 2025.

This reference covers the descriptor, the 7th character rules, the sibling codes, and the documentation the note has to carry. It also covers the selection errors that most often send a fracture claim back for medical billing rework.

ICD-10 code S42.332G: code description and billable status

S42.332G is a billable, encounter-specific ICD-10-CM diagnosis code valid for HIPAA-covered transactions in fiscal year 2026. It carries six clinical elements at once. Each one has to be supported by documentation before the code can be assigned.

The CMS ICD-10-CM code page publishes the annual tabular list that confirms effective dates and billable status for every S42 code. Check it against the applicable fiscal year before you submit.

Clinical overview: displaced oblique fracture of the humeral shaft

A displaced oblique fracture of the humeral shaft means the fracture line runs diagonally across the bone. The two fragments have also moved out of their normal alignment. Both the oblique morphology and the displacement have to be documented by the treating provider before the code holds up.

The humeral shaft runs from just below the surgical neck to just above the medial and lateral epicondyles. Oblique fractures here usually follow a direct blow, a twisting injury, or a fall on an outstretched arm. Rehabilitation runs long, so physical therapy practices and sports medicine practices often bill several follow-up encounters for one injury.

• Oblique fracture: the fracture plane runs at roughly 30 to 45 degrees to the long axis of the bone
• Displaced: the fragments are out of position, with cortical contact lost or badly reduced
• Shaft: the diaphysis of the humerus, distinct from the surgical neck, the head, or the epicondylar regions
• Left arm: laterality sits in the 5th character and must match the operative or clinical note

How to choose the 7th character G

The 7th character records the encounter rather than the injury, so it can change from one visit to the next. Character G designates a subsequent encounter for a fracture healing more slowly than expected. It is one of six encounter-type characters available on fracture codes in the S category.

Two questions settle the choice at any given visit, and the chart below runs through both.

Delayed healing is clinically distinct from nonunion. Under G, the fracture is still moving toward union, only slower than expected, usually with partial callus visible on imaging. Under K, the healing process has stopped altogether.

Treating the two as interchangeable produces either upcoding or undercoding, and both carry compliance risk. The CDC ICD-10-CM web tool carries the official tabular definition of each 7th character value.

The Official Guidelines treat “subsequent” as any encounter after active treatment has finished. Character A still applies when a new provider sees the patient while the fracture is in active treatment. The same encounter logic runs through the other fracture chapters, although long-bone codes such as S72.466E add separate characters for open fractures.

Where the code sits in the tabular list

S42.332G sits inside a strict classification hierarchy. Reading it from the top down is the quickest way to confirm that the most specific code has been selected.

Every character narrows the code further, and S42.332G leaves nothing unspecified. That means it can go out as it stands, as either a primary or a secondary diagnosis, with no additional characters needed.

Related ICD-10-CM codes for humerus shaft fractures

Several codes sit right next to S42.332G in the tabular list. Confusing laterality, displacement status, or fracture morphology is a common denial trigger. The table below maps the siblings coders reach for most often.

The AAPC Codify lookup handles crosswalk and sibling navigation for the whole S42.3 family. Where the tabular list classes a shaft fracture as other rather than oblique, spiral, transverse, or comminuted, the sequela code is S42.399S.

Checking the operative note’s laterality, displacement status, and healing assessment against this table catches most selection errors before the claim is built.

Approximate synonyms and alternate descriptions

Clinical notes and operative reports rarely use the ICD-10-CM descriptor word for word. These alternate phrasings all map to S42.332G when they describe the left arm at a subsequent visit with documented delayed healing.

• Delayed healing of displaced oblique fracture, left humeral shaft
• Oblique humerus shaft fracture, left, with delayed union, follow-up visit
• Left humeral shaft oblique fracture, displaced, slow healing, subsequent encounter
• Displaced oblique fracture of the left humerus diaphysis, delayed healing
• Follow-up for displaced oblique left humerus fracture with delayed union
• Left arm humerus shaft fracture, oblique pattern, displaced, subsequent visit for delayed healing

Query the provider when the note says only “slow healing” or “healing concerns”. The clinical threshold has to be established in words before character G can stand in place of character D.

Documentation requirements and coding tips

Four elements have to appear in the medical record before S42.332G can be assigned. Miss any one of them and the claim is exposed to a medical necessity denial or a downcoded response.

• Fracture morphology: the note has to describe the fracture as oblique. Spiral, transverse, and comminuted fractures take different codes even when displacement and laterality match.
• Displacement status: the provider has to record that the fracture is displaced. ICD-10-CM defaults to displaced when the note is silent, but explicit wording holds up far better in an audit.
• Laterality: the note has to name the left arm. An unspecified-laterality code exists, but it is not a substitute for S42.332G.
• Encounter type and healing status: the visit has to be a follow-up after active treatment. The provider also has to record a finding of delayed healing, not simply an ongoing fracture.

Those four elements are far easier to capture when the note has a fixed shape. A progress note template gives a busy provider exactly that. Build the healing-status line into the template and it stops being something a coder has to chase.

Practice management software like Pabau keeps the coded encounter and the claim in one record. Its claims management tools submit electronically through Pabau’s Claim.MD integration, where payer-specific edits run before the claim reaches the insurer.

The mechanics of clean claim submission are worth learning once. Fracture codes repay it, because the same four documentation elements decide almost every denial.

Common coding errors to avoid

These are the errors that trigger denials and audit flags on S42.332G claims. Each one has a documentation fix that costs a great deal less than a rework.

• Applying character D instead of G: using the routine healing character when the provider documented delayed healing is undercoding. The claim may well process, but the record will not support what was billed.
• Applying character G without provider documentation: reading delayed healing off the imaging yourself is overcoding. Query the provider whenever the note is ambiguous.
• Confusing G with K: delayed healing means healing is still progressing slowly. Nonunion means it has stopped. Different clinical findings, different codes.
• Missing laterality: if the note names neither left nor right, S42.332G cannot be assigned. S42.333G covers the unspecified arm, but payers reject it often.
• Using the wrong morphology code: S42.332G is for oblique fractures only. At the same site on the left arm, a displaced spiral fracture takes S42.342G. A displaced transverse fracture takes S42.322G, and a displaced comminuted fracture takes S42.352G.
• Applying an initial encounter code to a follow-up: character A applies while active treatment is still being rendered. Seeing the patient for the first time at a follow-up still takes D or G.

A pre-submission check for character, laterality, and morphology consistency catches most of this. Denial management for fracture codes becomes predictable once the error patterns are mapped.

Denial codes tell you which payer response maps to which coding defect. Consistent medical billing compliance routines for fracture documentation shorten the correction cycle from weeks to days.

How Pabau keeps fracture claims moving after the note is signed

Orthopedic practices usually find a fracture coding error twice. The first time is when the biller builds the claim. The second is weeks later, when the remittance comes back and someone has to work out which encounter it belongs to.

Pabau keeps charting, coding, and billing in the same client record. The 7th character a provider recorded at the visit is the one that reaches the claim form. Nobody rekeys it into a separate billing system.

Claims leave Pabau electronically through the Claim.MD clearinghouse, and their status flows back into that same record. Your billers can see which fracture claims were accepted, rejected, or paid without opening a second portal.

So a delayed-healing follow-up billed on Monday is confirmed or flagged inside the week. That is the difference between correcting a 7th character while the note is fresh and rediscovering it in next month’s denial report.

Keep fracture claims moving from note to payment

Pabau keeps charting, coding, and claim submission in one client record, and sends claims electronically through Claim.MD. Your billers can track every fracture claim to payment without a second system.

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Conclusion

Character selection on S42.332G is a documentation problem before it is a coding problem. Once the provider’s assessment names delayed healing in words, the 7th character follows on its own and there is nothing left to judge.

So the work worth doing sits upstream of the claim. Agree on the wording providers use for delayed union, then put a healing-status line in the follow-up note. The coder stops guessing between D, G, and K.

The trade-off is a slightly longer note in exchange for a claim that survives review. Book a demo to see how Pabau keeps coded encounters and claim status in one record for orthopedic and musculoskeletal practices.

Continue your research

Coding a fracture that has stopped healing altogether? ICD-10 Code S72.435M works through the nonunion 7th character on a long-bone fracture.

Handling a fracture that healed in the wrong position? ICD-10 code S52.042Q covers malunion coding on an open forearm fracture, including the open-fracture characters.

Coding a different part of the humerus? ICD-10 Code S42.452A sets out the lateral condyle codes, where laterality and displacement work the same way.

Billing soft-tissue injuries of the arm as well? ICD-10 code S46.921A explains how muscle and tendon injuries of the upper arm are classified.

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