ICD-10 code S42.463G: Medial condyle fracture, delayed healing

Key takeaways

S42.463G is the billable ICD-10-CM code for a displaced medial condyle humerus fracture seen at a subsequent encounter with delayed healing.

The 7th character G means union is running behind schedule. Nonunion is a different character, K, on a different code, S42.463K.

Character 6 carries displacement and laterality together. The 3 in S42.463G means displaced, with no side documented.

Use S42.463G only when the record never states a side. Right is S42.461G and left is S42.462G.

Practice management software like Pabau links code selection to the claim, so a 7th character is never carried over by habit.

ICD-10 code S42.463G covers a displaced fracture of the medial condyle of an unspecified humerus, at a subsequent encounter where healing is delayed. The code is billable and specific.

The 7th character is where this code slips. G means union is behind schedule but still moving. A fracture that has stopped uniting takes K instead, so the code becomes S42.463K.

Swap the two and the claim tells the payer the wrong story about the patient’s recovery.

S42.463G at a glance

S42.463G is a billable, specific ICD-10-CM code, valid for FY2026 and effective October 1, 2025. Nothing more specific sits below it, so it can go on a claim as it stands.

Two rows in that table cause most of the trouble. The 7th character sets the healing state, and the parent code S42.463 pays nothing without it.

What does S42.463G mean?

S42.463G means three things at once. The medial condyle of the humerus is fractured, the fragments have shifted out of alignment, and the record never names a side. At this encounter the patient has returned, and union is running behind schedule.

The medial condyle sits on the inner side of the distal humerus and forms part of the elbow joint. Displaced means the fragments have moved off their anatomical position. A nondisplaced fracture cracks the cortex but keeps alignment, and it codes to S42.464 through S42.466 instead.

How the code is built, character by character

• S42 (characters 1 to 3): Fracture of shoulder and upper arm, inside Chapter 19 block S40-S49
• 4 (character 4): Narrows the site to S42.4, fracture of the lower end of the humerus
• 6 (character 5): Narrows it again to S42.46, fracture of the medial condyle of the humerus
• 3 (character 6): Sets displacement and laterality together, so 3 means displaced with no side documented
• G (character 7): Subsequent encounter for fracture with delayed healing

Character 6 is often read as a laterality digit, and that is where coders go wrong. It encodes displacement and side together. Values 1 to 3 cover displaced fractures on the right, the left, and an undocumented side. Digits 4 to 6 cover nondisplaced fractures in the same order.

Clinical notes describe this injury in several ways. Map any of the following to S42.463G when the side is missing and the physician has documented delayed healing.

• Displaced medial condyle humerus fracture with delayed union
• Distal humerus medial condyle fracture, slow to heal
• Delayed consolidation of a medial condyle fracture

The 7th character G means delayed healing

G marks a follow-up visit where union is behind schedule but still under way. It is the riskiest character in the whole string, because six others sit right next to it in the same table. Every code in S42.4 draws from that one set.

A, B, D, G, K, P and S are the only encounter characters S42.4 allows. Gustilo-Anderson characters belong to the forearm, femur and lower leg categories. An open fracture in the shoulder block takes B at the initial encounter, as S42.143B shows.

How delayed healing differs from nonunion and malunion

Four characters describe four healing states, and none of them substitutes for another. D, G, K and P each tell the payer something specific about where the bone has got to.

Walk through one case and the line becomes obvious. A surgeon fixes a displaced medial condyle fracture in March. At the five-month visit, imaging shows thin callus, and the note records delayed union. That encounter codes to S42.463G. If the same note said the fracture had not united, the code becomes S42.463K.

Delayed healing still describes a bone that is knitting. Nonunion describes one that has stopped. That single distinction separates S42.463G from S42.463K, and it drives most of the errors on this code.

Moving from D to G needs the physician to say so. Imaging that shows sparse callus at four months supports the change, but the note has to carry the diagnosis. Coders should not read delayed healing out of a radiology report on their own.

The same pattern runs through the rest of the shoulder and arm family. S42.442K shows what a nonunion note has to support after a displaced medial epicondyle fracture. S42.256P does the same job for malunion at the greater tuberosity.

What a displaced medial condyle fracture involves

Coding this well starts with the anatomy. The medial condyle carries the trochlea, the surface the ulna hinges against. A displaced fracture there disturbs the elbow articulation, so most cases go to surgical reduction and fixation.

These fractures turn up most often in children who fall onto an outstretched hand, though they happen at any age. Delayed healing appears more often after unstable fixation, poor blood supply to the fragment, or smoking.

• Population at risk: Children after a fall on an outstretched hand, plus adults after higher-energy elbow trauma
• Displacement: Fragments have moved off their anatomical position, which is what separates S42.463 from S42.466
• Delayed healing: Union is still incomplete at the point it would normally be finished, confirmed on imaging
• Clinical management: Continued protection, restricted loading, and sometimes bone stimulation or revision fixation
• Coding note: Laterality has to come from this encounter’s documentation, never from an assumption

Where S42.463G sits in the ICD-10-CM hierarchy

The code sits seven characters deep, at the bottom of a five-step path. Walking that path is the fastest way to confirm you have landed on the most specific billable option.

• Chapter 19: Injury, poisoning and certain other consequences of external causes (S00-T88)
• Block S40-S49: Injuries to the shoulder and upper arm
• S42: Fracture of shoulder and upper arm
• S42.4: Fracture of lower end of humerus
• S42.46: Fracture of medial condyle of humerus
• S42.463: Displaced fracture of medial condyle of unspecified humerus
• S42.463G: Displaced fracture of medial condyle of unspecified humerus, subsequent encounter for fracture with delayed healing

Only the full seven-character code is billable. S42, S42.4 and S42.463 all reject for insufficient specificity. The AAPC code range lookup shows the same tabular path, and the CDC ICD-10-CM tool carries the official index entries.

How the S42.46x siblings differ from S42.463G

Only character 6 changes across the six delayed-healing codes for a medial condyle fracture. Everything else in the string stays put. Check the record for a documented side before you default to the unspecified variant.

A parallel nonunion family sits alongside this one, and it is easy to grab by mistake. S42.461K, S42.462K, S42.463K and S42.466K describe the same fractures where union has stopped altogether. Reach for a K code only when the physician has documented nonunion, never for slow healing.

Orthopedic and sports medicine practices track these follow-ups across months. Sports medicine software keeps each encounter’s documentation next to the code chosen that day.

ICD-9-CM has no exact match for S42.463G

There is no clean single equivalent, because ICD-9-CM had no character for delayed healing. Legacy record conversions and historical claim reviews still reach for the old system, so the closest stand-ins are worth knowing.

ICD-9-CM recorded malunion at 733.81 and nonunion at 733.82, with nothing in between. Delayed healing had to be inferred from the aftercare code and the clinical note. The WHO ICD-10 browser sets out why the two architectures do not line up.

Use these mappings for record conversion and payer queries only. ICD-9-CM codes are not valid for FY2026 billing.

S42.463G groups to the aftercare MS-DRGs

For inpatient coders, S42.463G groups to the aftercare DRGs rather than the acute fracture ones. That grouping reflects the nature of the encounter, which is continued management of a fracture already treated.

Which of the three applies depends on the secondary diagnoses on the claim. Osteoporosis, diabetes and other comorbidities can move the case up a tier.

A surgical procedure at the same encounter changes the picture again, because the procedure code drives grouping ahead of the diagnosis.

Grouping logic shifts with each IPPS final rule, so confirm the current assignment against the CMS ICD-10 resources and your Medicare Administrative Contractor. Do not attach dollar figures without checking your own payer contract.

What the note must say before you code it

Six elements have to appear in the record before S42.463G holds up. A missing one is what an auditor finds first.

• Fracture site: The note must say medial condyle or an accepted equivalent. A bare “distal humerus fracture” will not carry S42.46x specificity.
• Displacement status: The record must confirm the fragments are displaced. Nondisplaced medial condyle fractures code to S42.464G through S42.466G.
• Encounter type: The note must establish that the patient has been treated for this fracture before. A first active treatment visit takes A or B.
• Delayed healing: The physician must document that union is behind schedule. Imaging findings help, but the diagnosis has to be the clinician’s rather than the coder’s reading.
• Nonunion ruled out: If the note says the fracture has stopped healing, the code is S42.463K. Delayed healing and nonunion take different characters.
• Laterality: If any part of the record names a side, use S42.461G or S42.462G. S42.463G suits only a record that genuinely never states it.

Practices running fracture rehabilitation in a physical therapy EMR capture these elements more consistently. The template asks for each one at the point of care.

Digital intake forms that prompt for fracture laterality cut down on later coder queries. An unspecified-laterality code on an orthopedic follow-up invites payer questions, so recording the side serves the clinical record and the claim at once.

How the claim moves, and where it stalls

A delayed-healing claim passes through several hands before a payer sees it. The 7th character can drop out at any of them, so it helps to know the route.

1. The clinician documents the visit and states that union is delayed.
2. A coder reads that note and builds the full seven-character string.
3. The charge posts with the E/M or procedure code for the encounter.
4. A clearinghouse scrubs the file for format errors and invalid code combinations.
5. The payer adjudicates, and may ask for the note months later.

Two steps stall delayed-healing claims more than the rest. Step two goes wrong when the coder carries forward last visit’s character out of habit. The other failure sits at step one, where the note describes slow healing without naming a diagnosis.

Five quick questions catch both problems before submission.

• Does the note name the medial condyle, and not just the distal humerus?
• Does it confirm that the fragments are displaced?
• Has the physician stated delayed healing in words, not only on imaging?
• Does any part of the record name a side you have missed?
• Is the string seven characters long, with G in the final position?

Five yes answers turn a coded encounter into a clean claim. One no answer is a query to the clinician, and that is far cheaper than an appeal.

Six mistakes that get S42.463G denied

Six mistakes account for most denials on this code. Each one is catchable before the claim goes out.

1. Coding G when the note says nonunion: Delayed healing means union is still progressing. Where the physician has documented failure to unite, the code is S42.463K.
2. Coding K when the note says slow healing: The reverse error is just as common. A fracture behind schedule but still knitting takes G.
3. Using A at a follow-up visit: Initial encounter applies only to the first active treatment. A six-month post-operative visit is a subsequent encounter, whatever the plan says.
4. Reading character 6 as laterality only: Character 6 carries displacement as well. Choosing 3 for a nondisplaced fracture puts the wrong anatomy on the claim.
5. Defaulting to unspecified laterality: If the operative report, radiology report or exam names a side, S42.461G or S42.462G applies. Habitual unspecified coding shows up in audit data.
6. Stopping at S42 or S42.4: Neither is billable. Only the full seven-character code belongs on a claim.

Practice management software with coding validation flags an incomplete string before submission. Where a denial has already landed, a structured denial management process tells you whether the character or the documentation caused it.

For unusual scenarios, the AHA Coding Clinic publishes rulings on fracture healing characters and sequelae.

Related codes you may need instead

Each of these changes one element of the picture: the bone, the healing state, or the encounter type.

• S52.021R: Displaced olecranon fracture of the right ulna at a malunion follow-up
• S52.261R: Segmental ulna shaft fracture that united in a poor position
• S42.012P: Anterior displaced left clavicle fracture with malunion
• S42.009B: Clavicle fracture at an initial encounter for open fracture
• S22.022G: The same delayed-healing character on a T2 burst fracture

How Pabau keeps the 7th character consistent

A code lookup answers the question and stops there. The claim gets assembled afterwards, often by hand, and that hand-off is where a G quietly becomes a K.

Practice management software like Pabau closes that hand-off. Pabau’s claims management tools keep diagnosis coding inside the clinical encounter, so the note, the code and the invoice sit in one record. Nobody retypes a seven-character fracture code.

Fracture patients come back repeatedly on the same injury, and each visit may need a different 7th character. Pabau’s patient records show which character went out last time, so delayed healing is never copied forward out of habit.

Connect the diagnosis to the claim

Pabau’s claims management tools tie each ICD-10 code to the encounter that justifies it. That cuts lookup errors and helps orthopedic and physical therapy practices submit cleaner claims first time.

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Conclusion

S42.463G is a documentation code before it is a billing code. Every element it asserts has to be readable in the note, from the fracture site to the healing state.

Get the 7th character right and the rest of the string usually follows. Treat G as a stand-in for nonunion and the claim tells the payer the wrong story about a patient who is still healing.

Fracture follow-ups create a lot of coding rework, and most of it starts with a code that was never tied to its note. Book a demo to see how Pabau keeps the note, the code and the claim in step.

Continue your research

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Documenting nonunion on a different bone? S02.651K sets out what a K character needs in the mandible.

Checking distal circulation at follow-up? Circulation assessment walks through the parameters and how to record them.

Wondering what happens after you submit? Medical claims clearinghouse explains the scrubbing step every claim passes through.

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