ICD code S78.112D – Complete traumatic amputation at level between left hip and knee

Key takeaways

S78.112D is a billable ICD-10-CM code for a complete traumatic amputation of the left thigh, between the hip and knee.

The 7th character D marks a subsequent encounter, so active treatment has ended and the visit is follow-up care.

Inside category S78, the 4th character sets the amputation level and the 5th sets complete versus partial.

The record has to show four elements: the left side, the level between hip and knee, complete severance, and follow-up care.

The code is valid for fiscal year 2026, which runs from October 1, 2025 through September 30, 2026.

S78.112D is billable, and valid through September 2026

S78.112D is billable on its own, and it needs no extra character before submission. The code describes a complete traumatic amputation of the left thigh, at the level between the hip and knee, reported at a follow-up visit.

CMS lists it in the ICD-10-CM code set as valid for HIPAA-covered transactions from October 1, 2025 through September 30, 2026.

The 4th character sets the level and the 5th sets completeness

That seven-character string carries five separate decisions. Read it left to right and you get the body region, the amputation level, complete versus partial, the side, and the encounter type. Misread one position and you have a different code.

The decimal point sits after the third character, which is standard ICD-10-CM format. Two positions cause most of the confusion. The 4th character sets the level, so S78.0 is an amputation at the hip joint and S78.1 is one between the hip and knee.

The 5th character then sets completeness within that level. Under S78.1, complete is S78.11 and partial is S78.12, and the same split runs under S78.0 as S78.01 and S78.02. The grid below maps all four stems.

The 7th character D means active treatment has ended

The 7th character D says active treatment is over. Under the ICD-10-CM official guidelines (Section I.C.19), every injury code in the S00-T88 chapter needs a 7th character to name the encounter type. S78.112 takes three of them.

A common misreading treats D as visit number two. The character tracks the phase of care, not the count of visits. A patient at their first outpatient appointment after discharge already warrants D, because the surgical phase is over. Someone returning for revision surgery months later goes back to A.

S78.112S covers the other direction. Use it when the visit treats a direct late consequence of the amputation. A chronic stump infection or phantom limb pain months later fits, once the injury itself has resolved.

When S78.112D is the right code for a follow-up visit

Reach for S78.112D when a patient with a prior complete left thigh amputation comes in for care that is not acute surgical management. In practice, that covers five situations:

• Stump wound care: dressing changes, suture or staple removal, or wound checks once the amputation site has been surgically closed
• Prosthetic fitting: stump evaluation, socket fitting, or gait training with the prosthetist, physiatrist, or surgeon
• Physical or occupational therapy: outpatient sessions for mobility, strengthening, or activities of daily living after the amputation
• Follow-up imaging: X-rays or ultrasound to check stump healing, bone overgrowth, or heterotopic ossification
• Medication management: prescription reviews for post-amputation pain, where the amputation is the relevant diagnosis

Outpatient therapy is where this matters most. Payers separate initial from subsequent encounter codes during claim review, so an initial-encounter code on a routine therapy visit is a familiar denial trigger.

One digit separates the left thigh from the right

ICD-10-CM asks for laterality on paired anatomical sites, and the 6th character in S78.112D is what encodes left.

Change it and you have a different billable code. It pays to check the operative note rather than the referral. An unspecified code on a documented case is a specificity error payers flag.

Bilateral cases carry both codes. S78.112D and S78.111D can sit on the same claim, and payers and clearinghouses process each line separately. So both have to be fully specified.

Four documentation elements payers look for

Auditors reviewing an S78.112D claim look for four elements in the medical record. A missing one is enough to support a denial or a downcode, because the code is only as defensible as the note behind it.

• Left side, stated plainly: the operative report, discharge summary, or clinical note has to say “left thigh”. Wording like “the affected limb” gives a payer room to ask for more records.
• Level between hip and knee: the record has to place the amputation at the transfemoral level. A hip disarticulation belongs under S78.01x, and a below-knee amputation belongs under S88.1xx.
• Complete severance: the record has to confirm the limb segment came off entirely. A partial amputation leaves tissue continuous, and at this level it codes to S78.12x instead.
• Follow-up rather than active treatment: this visit’s note has to read as follow-up care. Phrases such as “stump healing well”, “prosthetic socket adjusted”, or “gait training” settle it.

A note template is the cheapest fix here. Practices treating patients after traumatic limb loss can capture all four elements at every follow-up visit, which removes the audit exposure for this code family.

How the claim moves from visit to remittance

Coding is one step in a longer sequence, and knowing where the claim can stall tells you what to check first.

Here is the path a subsequent-encounter amputation claim takes:

1. The provider documents the visit, naming the side, the level, the complete severance, and the follow-up purpose.
2. The coder selects S78.112D and pairs it with the CPT or HCPCS codes for what happened at the visit.
3. Billing verifies eligibility and confirms which payer is responsible, since workers’ compensation and Medicare apply different edits to trauma follow-ups.
4. The claim leaves on a CMS-1500 form or in an 837P file, usually through a clearinghouse.
5. The clearinghouse scrubs it and returns front-end rejections within a day, before the payer sees the line.
6. The payer adjudicates and sends back an electronic remittance advice, either paying the line or attaching a denial code.

Steps three and five are where a wrong 7th character surfaces. Neither one tells you the character was wrong, though, so the fix has to start in the note.

The mistakes that get these claims denied

Three errors account for most denials in this code family, and each is visible before the claim goes out. Our guide to denial codes covers the remark codes that come back when one slips through.

Leaving A in place after discharge

This is the most common one. Once the patient is seen in an outpatient setting for follow-up, D applies, however soon after the amputation that visit happens. Payers cross-reference encounter type against facility claim data, so S78.112A on an outpatient rehabilitation claim stands out.

Falling back on the unspecified digit

S78.119D exists for records that genuinely do not name a side. ICD-10-CM asks for the most specific code available, so a documented left thigh means S78.112D. Reaching for the unspecified digit invites a payer edit or a request for records.

Mixing up complete and partial

A partial amputation leaves some tissue continuous, while a complete one severs the segment entirely. Coding S78.122D when the operative report describes a complete transfemoral amputation is a clinical mismatch, and post-payment audits catch it. Read the operative description before you pick the 5th character.

Before you submit, run through this check

Five questions catch the common problems before the claim leaves. Run them at the point of coding, rather than after the remittance arrives, because a clean claim costs far less than a corrected one.

• Does this visit’s note describe follow-up care rather than active surgical treatment?
• Does the record say “left” somewhere a payer can find it quickly?
• Does it place the amputation between the hip and the knee?
• Does it confirm complete severance rather than a partial amputation?
• Are the paired procedure codes consistent with a follow-up visit?

How Pabau keeps subsequent-encounter claims moving

In many practices, the coder reads a narrative note, retypes the code into a payer portal, and hears about the denial three weeks later. The note, the code, and the claim live in three separate places. Nobody spots the mismatch until the money is late.

Practice management software like Pabau keeps all three against the same appointment. The follow-up note, the diagnosis code, and the claim sit in one record, so nobody is retyping S78.112D from a printout. Pabau’s claims software for practices carries the current ICD-10-CM catalog, so the code is there to select.

For US practices, claims go out electronically through the Claim.MD clearinghouse. Eligibility is checked before the visit, and remittances post back afterwards.

A denied line then shows up next to the visit that caused it. You can correct the documentation while the patient is still in your care.

Submit S78.112D claims without the back-and-forth

Pabau submits ICD-10 diagnosis codes electronically to 4,000-plus US payers through the Claim.MD clearinghouse. Eligibility is checked before the visit, remittances post back after it, and nobody re-enters the code by hand.

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Conclusion

Follow-up amputation coding comes down to one character, and the record either supports it or it does not. If the note reads as follow-up care and names the side, the level, and the complete severance, S78.112D holds up under review. If it does not, no amount of claim scrubbing rescues the line.

So the fix sits upstream of billing. Build the four elements into the post-amputation note template once, and your coder stops hunting for them at every visit.

Book a demo to see how Pabau ties the follow-up note, the diagnosis code, and the claim to one appointment.

Continue your research

Need guidance on denial patterns for injury codes? Denial management in healthcare covers the most common reasons ICD-10 injury claims are denied and how to address them.

Submitting claims through a clearinghouse? Understanding the 837 file explains how electronic claim files are structured and validated before reaching payers.

Want to verify insurance coverage before the appointment? Insurance eligibility verification outlines real-time eligibility checking and how it reduces claim rejections for post-acute care visits.

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