ICD-10 Code S78.922S: Left Hip & Thigh Amputation Guide

Key takeaways

ICD-10 Code S78.922S describes a partial traumatic amputation of the left hip and thigh at an unspecified level, coded as a sequela encounter.

The S suffix means the acute injury phase has resolved. The patient now presents for a condition that resulted directly from the original amputation.

The sixth character carries laterality in this family. A 1 is right, a 2 is left, and a 9 is unspecified, so S78.922S is a left-side code.

Using A (initial) or D (subsequent) instead of S at a sequela visit is a common denial trigger. Verify the encounter type before you submit.

Practice management software like Pabau captures laterality and healing status as structured fields, so a coder reads a field instead of interpreting a note.

ICD-10 Code S78.922S: definition and clinical meaning

ICD-10 Code S78.922S is the billable ICD-10-CM code for the late effects of a partial traumatic amputation of the left hip and thigh. It applies once the original amputation has healed and the patient returns for a condition that amputation caused. The record has to name the left side.

The full official descriptor for S78.922S is: Partial traumatic amputation of left hip and thigh, level unspecified, sequela. It sits within ICD-10-CM category S78, which covers traumatic amputations of the hip and thigh. The code is valid for the current fiscal year per the CMS ICD-10-CM code files, and it is billable at this level of detail. It is typically reported as a secondary or associated code rather than the principal diagnosis.

Four elements define this code. First, the amputation is partial, not complete, so tissue continuity remains. Second, the site is the hip and thigh region. The record did not pin the amputation to the hip joint or to a level between hip and knee. Third, the affected limb is the left one. Fourth, the S suffix marks the encounter as a sequela.

The descriptor’s wording is where this code gets misread. Level unspecified in the S78.9 subcategory refers to the anatomical level, not to the side. Laterality is still specified here, and in S78.922 it is specified as left. The code for a record that documents no side at all is S78.929S.

Understanding the 7th character: A, D, and S suffixes

The last character on a traumatic injury code sets the encounter type. On ICD-10 Code S78.922S that character is the S, and it changes what the claim says about the visit.

Three encounter types apply to traumatic injury codes in the S chapter, per the ICD-10-CM Official Guidelines. Those guidelines are approved jointly by CMS, NCHS, AHA, and AHIMA. NCHS, part of the CDC, maintains the ICD-10-CM classification itself.

The line between D and S sits at the point healing finishes. The D suffix covers visits while the injury itself is still healing, the phase that a code like S49.032D describes. Once healing is complete, any later visit for a condition the injury caused moves to the S suffix.

Phantom pain, functional loss, and neurovascular sequelae all sit on that side of the line. These are not interchangeable. Submitting D where S is correct, or the reverse, can trigger medical necessity denials or audit flags.

Codes shorter than six characters need a placeholder X in the sixth position, which is why the cervical sequela code reads S12.14XS. S78.922 already fills six characters, so the S attaches directly. Fracture categories also use a longer 7th-character list that covers open fractures and healing status, as on S82.016B.

S78.922S in the S78 code category hierarchy

Category S78 covers all traumatic amputations of the hip and thigh. Knowing where ICD-10 Code S78.922S sits in that hierarchy lets a coder pick the right sibling. That matters when the record documents the level or the completeness more precisely.

The S78 family splits first by amputation site, then by completeness, and finally by laterality. The ICD-10-CM tabular list organizes the site level as follows:

• S78.0xx — traumatic amputation at hip joint
• S78.1xx — traumatic amputation at level between hip and knee
• S78.9xx — traumatic amputation of hip and thigh, level unspecified

Within S78.9, the fifth character separates complete from partial amputations:

• S78.91x — complete traumatic amputation of hip and thigh, level unspecified
• S78.92x — partial traumatic amputation of hip and thigh, level unspecified

The sixth character then carries laterality, and the pattern holds across both families:

• 1 — right hip and thigh
• 2 — left hip and thigh
• 9 — unspecified side

S78.922 is therefore the partial amputation of the left hip and thigh at an unspecified level. Appending the 7th character S gives the full code S78.922S. If the record names the right side instead, the correct code is S78.921S. If it names no side at all, use S78.929S.

Related S78 codes and when each one applies

Coders working with hip and thigh amputation diagnoses frequently need to cross-reference adjacent codes. The table below covers the most clinically relevant siblings of S78.922S, useful for both specificity upgrades and sequencing decisions. The CDC/NCHS ICD-10-CM lookup tool is the authoritative source for verifying current descriptors and parent-child relationships.

The two level-specific codes at the bottom of the table are the specificity upgrade path here. S78.922S already carries the side, so what it leaves open is the level.

Before you move to a more specific code, confirm the record states the level or the completeness explicitly. Do not infer either from prior visit notes or surgical history unless the treating provider documented it. Pabau’s claims management software flags incomplete fields before a claim leaves the practice.

Billing and coding guidelines for S78.922S

Sequela coding for traumatic amputations follows the ICD-10-CM Official Guidelines, Section I.C.19.a. That section sets the 7th character rules for the Chapter 19 injury codes. Two rules govern most billing scenarios involving ICD-10 Code S78.922S.

Rule 1 — Sequela code sequencing. When the reason for the visit is the sequela condition itself, code that condition first and S78.922S second. Phantom limb pain following the amputation is the textbook example. Section I.B.10 of the guidelines puts the residual condition first and the sequela code second.

Rule 2 — No aftercare Z code on an injury claim. Section I.C.19.a bars aftercare Z codes for injury aftercare entirely, so Z47.81 does not belong on a claim for this amputation at any stage. The healing phase is coded with the injury code itself plus the 7th character D, which here means S78.922D. Once healing is complete and a late effect drives the visit, that same code takes the S suffix.

Documentation requirements

The clinical record must support every element of S78.922S before the code goes on a claim. Coders should verify the following before submission:

• Injury resolved: Provider documentation states the original amputation wound has healed, or that acute care has concluded.
• Late-effect condition identified: The presenting complaint is explicitly linked to the prior amputation. Stump pain, phantom sensation, and prosthetic complications are typical.
• Left side documented: The record names the left hip and thigh. If it names the right side, use S78.921S. If it names no side, use S78.929S.
• Amputation was partial: Operative or clinical notes confirm tissue continuity. Complete amputation codes do not apply.
• Level genuinely absent: The record does not place the amputation at the hip joint or between hip and knee. If it does, a level-specific code such as S78.022S or S78.122S is more accurate.
• Causal connection documented: The provider notes a direct relationship between the previous injury and the current complaint. ICD-10-CM guidelines require this link to be stated, not assumed.

Practices managing complex trauma or post-amputation rehabilitation caseloads benefit from structured documentation workflows. Pabau’s client record and digital forms tools let care teams build standardized intake and encounter templates.

Those templates capture the side, the healing status, and the causal link at the point of care. That leaves less for the coder to reconstruct at claim time. Physical therapy practices handling post-amputation rehabilitation can also review physical therapy EMR software for workflows specific to that setting.

Common coding errors to avoid with amputation sequela codes

S78.922S generates a predictable set of claim errors. Nearly all of them trace back to two characters. One is the encounter-type suffix and the other is the laterality digit. Payers expect every diagnosis code on a claim to be supported by the current encounter’s record.

• Treating S78.922S as an unspecified-laterality code. The sixth character 2 means left. S78.929S is the unspecified-side code, and S78.921S is the right-side one. Reaching for S78.922S when the side is unknown puts detail on the claim that the chart does not support.
• Ignoring the level of the amputation. S78.922S says the level within the hip and thigh region was never documented. When the note does place the amputation at the hip joint or between hip and knee, code that level with S78.022S or S78.122S instead.
• Using the A suffix at follow-up visits. A applies only while the patient is receiving definitive, active treatment for the injury. Routine post-surgical checks during healing belong under the D suffix. Visits for late-effect conditions belong under the S suffix. Keeping A on a claim after active treatment has ended is a common audit target.
• Conflating D and S encounters. D covers the healing phase, when the injury is not yet resolved. S covers the period after healing, when a resulting condition such as phantom pain or a stump complication drives the visit. These are sequential, not overlapping.
• Omitting the sequela condition code. When the visit is for a late-effect condition, that condition has its own code and sequences first. Submitting S78.922S on its own is incomplete and can trigger a medical necessity review.
• Reaching for an aftercare Z code on a traumatic amputation claim. The guidelines exclude aftercare Z codes such as Z47.81 from injury aftercare altogether. Code the healing phase as S78.922D and the late-effect phase as S78.922S. Neither phase takes an aftercare Z code.

Sports medicine and orthopedic practices managing trauma rehabilitation cases meet these errors most often. Sports medicine software can prompt providers for the fields that prevent them. Those prompts appear at the point of care, before the note is signed.

How Pabau supports accurate amputation sequela coding

On most teams the side and the healing status live in a free-text note. The coder then reads that note again at claim time to work out which 7th character applies. That re-reading is where laterality and encounter-type errors enter a claim. The fix is to capture those fields once, in a structured place, at the point of care.

Pabau’s digital forms and client records do that. Care teams build encounter templates that ask for the affected side and the amputation level. The same template records whether the wound has healed and how it links to the current complaint.

Every answer stays on the client record, so the coder reads a field rather than interpreting prose. Reporting then shows which encounters still have those fields empty.

Claims management picks it up from there. Pabau runs pre-submission field-completeness checks, routes each claim to the right insurer, and tracks its status on one dashboard. Coders see what has been paid, what is pending, and what came back, without chasing insurer portals one at a time.

Catch incomplete claims before they reach the insurer

Pabau's claims management tools validate field completeness before submission, route each claim to the right insurer, and track its status on one dashboard. Fewer claims come back to your practice for missing information.

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Conclusion

Getting the encounter type and the side right is what keeps traumatic amputation claims clean. ICD-10 Code S78.922S belongs on encounters where the original partial amputation has healed. The patient now presents for a condition that amputation caused, and the record names the left side.

The sixth character is the one worth double-checking. A 2 there means left, not unspecified, so a chart that never names a side calls for S78.929S. What S78.922S leaves genuinely open is the level.

A note that places the amputation at the hip joint or between hip and knee supports a more specific code. Audit programs look for errors in both directions. They flag unspecified codes where the chart supports more detail, and specific codes the chart does not support.

Practices managing post-trauma rehabilitation caseloads benefit from documentation templates that capture these markers at the point of care. Pabau’s compliance management tools and structured encounter workflows keep coding consistent from the first visit through the sequela phase. Book a demo to see how Pabau supports diagnosis documentation and claim submission for rehabilitation caseloads.

Continue your research

Coding another S-chapter sequela? S81.009S walks through an open wound of the knee with the same 7th character and sequencing rules.

Coding the initial encounter instead? S80.812A shows the A suffix in place on a left-side injury, with laterality in the same character position.

Working with the longer fracture 7th-character list? S52.242J shows how that list handles an open fracture at a later visit.

Billing the rehabilitation side of the case? 97161 is the low-complexity physical therapy evaluation code used at the start of a rehabilitation episode.

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