ICD-10 Code S01.322S: Laceration with foreign body of left ear, sequela

Key Takeaways

S01.322S is a billable ICD-10-CM code for laceration with foreign body of left ear, sequela, valid for FY2026 (October 1, 2025 through September 30, 2026).

The 7th character S designates a sequela encounter, meaning the patient presents with a late effect of a prior left ear laceration rather than an active injury.

Documentation must establish a causal link between the original ear laceration and the current presenting condition to support S01.322S; without that link, the code cannot be applied.

Pabau’s claims management software helps coding and billing teams apply sequela codes accurately, reducing claim denials tied to insufficient encounter-type documentation.

Claims for sequela encounters get denied more often than almost any other encounter type. The reason is almost always the same: the documentation doesn’t clearly establish that the current condition is a direct late effect of an earlier injury. For left ear lacerations involving a retained or removed foreign body, that documentation gap means ICD-10 Code S01.322S goes unsupported and the claim bounces back. This reference covers the full code breakdown, encounter-type selection, hierarchy, synonyms, related codes, and the documentation requirements that keep S01.322S claims clean.

S01.322S sits within the S00-S09 chapter of ICD-10-CM (Injuries to the head) and is one of three encounter-type variants under the S01.322 parent code. Understanding where it fits in the hierarchy, when to apply it versus S01.322A or S01.322D, and what the medical record must contain are all covered below. Coders and billing staff at clinics managing wound care, ENT follow-up, or urgent care sequelae will find this guide directly applicable to their claims management workflow.

ICD-10 Code S01.322S: Quick reference

The table below gives coders an at-a-glance reference for S01.322S. All data reflects the FY2026 ICD-10-CM edition, effective October 1, 2025, as confirmed by the CMS ICD-10 codes page and cross-checked against the official tabular list.

Confirming billable status before submitting a claim is standard practice. The CDC/NCHS ICD-10-CM web tool provides the authoritative lookup for current-year code validity and is updated each October 1 to reflect annual revisions. Pabau’s digital forms and client record features help practices capture the clinical documentation needed to support sequela codes at submission.

What does S01.322S mean? Full code breakdown

Every segment of S01.322S encodes a specific clinical detail. Misreading any segment leads to the wrong code selection. Here is what each character set communicates.

The laterality distinction matters. S01.321 covers the right ear; S01.322 covers the left. When documentation is silent on which ear was involved, coders cannot default to either side. The correct path is to query the provider before coding. Assigning laterality without documented evidence is a specificity error that may trigger a payer audit.

The foreign body designation is equally important. S01.322 applies only when a foreign body is present or was present at the time of the original laceration. A laceration without foreign body involvement maps to S01.312 (left ear, without foreign body). Applying S01.322S to a plain laceration overstates the complexity of the original injury and misrepresents the clinical record. Good medical documentation practices at initial presentation prevent this confusion downstream.

7th character extensions for S01.322: A, D, and S explained

The ICD-10-CM Official Guidelines for Coding and Reporting require coders to append the correct 7th character to every injury code to identify the type of encounter. For S01.322, three extensions exist. Selecting the wrong one is one of the most common reasons sequela claims fail on first submission.

A key principle: the 7th character reflects the encounter purpose, not the severity of the original injury. A patient seen six months after the laceration for an unrelated condition does not trigger S01.322S. S01.322S applies only when the presenting complaint at this encounter is directly caused by the prior laceration with foreign body. That causal relationship must appear in the clinical note. Practices using ICD-10 coding workflows for multiple code types benefit from structured templates that prompt providers to document encounter purpose explicitly.

ICD-10-CM hierarchy and parent codes for S01.322S

Understanding the hierarchy helps coders confirm code specificity and identify when a less specific parent code is appropriate. S01.322S is a valid leaf-level code, meaning no child codes exist below it. When it applies, there is no reason to report a parent code instead.

The AAPC Codify ICD-10-CM lookup lets coders navigate this hierarchy interactively and verify parent-code relationships before finalising a claim. For multi-code claims, the same hierarchy check confirms that secondary codes do not contradict the principal diagnosis. Billing teams managing ENT or wound care encounter types will recognise this pattern from other injury-chapter ICD-10 codes with the same A/D/S 7th character structure.

Approximate synonyms and index entries for laceration with foreign body of left ear, sequela

Coders often search by clinical description rather than code number. The following synonyms and index terms all map to S01.322S in the ICD-10-CM alphabetic index. Recognising them prevents the coder from selecting a near-miss code in the same family.

• Laceration with foreign body, left ear, late effect
• Left ear laceration with foreign body, sequela
• Open wound left ear with foreign body, sequela encounter
• Late effect of laceration with foreign body of ear (left)
• Sequela of open wound of left ear with foreign body
• Left ear wound sequela, foreign body involved
• Left auricle laceration with foreign body, subsequent complication

When clinical notes use descriptors like “scar from prior left ear laceration” or “keloid following foreign body removal from left ear,” those terms point to S01.322S as the sequela code, paired with the code for the current condition being treated (such as L91.0 for hypertrophic scar). Proper ICD-10 coding discipline involves reading both the principal diagnosis and any sequela codes in the context of the complete encounter note.

When to use S01.322S: sequela vs. initial vs. subsequent encounters

Encounter type selection is the most consequential coding decision for this code family. Getting it wrong produces a claim that either overstates the acuity of care (initial when subsequent is correct) or understates it (subsequent when a sequela is the true presenting condition).

When S01.322A applies (initial encounter)

Use S01.322A when the patient is being seen for active treatment of the laceration itself. This includes the emergency department visit where the laceration is first repaired, any encounter where a retained foreign body is removed, and visits where systemic treatment (antibiotics, tetanus) is initiated because of the wound. The injury is the current focus of care, and treatment is ongoing.

When S01.322D applies (subsequent encounter)

Use S01.322D when the wound is healing as expected and the patient returns for a routine check. Suture removal, dressing changes, and monitoring for infection during the healing phase all fall under the subsequent encounter designation. The wound is still the reason for the visit, but active treatment has concluded and healing is in progress.

When S01.322S applies (sequela encounter)

Use S01.322S when the acute phase of the laceration has fully resolved and the patient now presents with a condition that is a direct consequence of that prior injury. Common sequela include auricular scarring, keloid formation at the laceration site, chronic pain or sensitivity localised to the wound area, and functional changes to the pinna caused by scar contracture. The original wound is healed. What the provider is treating today is the lasting effect of that wound.

Per ICD-10-CM Official Guidelines Section I.C.19.a, the sequela code (S01.322S) is sequenced after the code for the specific sequela condition being treated at the encounter. For example, a patient presenting for steroid injection into a keloid scar at the left ear following a prior laceration with foreign body would carry both the keloid code (L91.0) as the principal diagnosis and S01.322S to identify the cause. Practices that manage complex injury follow-up benefit from structured compliance management workflows that prompt this dual-code structure in the clinical note.

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Documentation requirements for S01.322S

S01.322S will not survive a payer audit without three documentation elements in the medical record. Missing any one of them is grounds for denial or a request for additional information.

• Prior injury record: The medical record must reference the original laceration with foreign body of the left ear. This can be a prior visit note, a surgical report, or a historical summary in the current note. The original encounter code (S01.322A) should ideally be traceable in the patient’s record.
• Causal link: The provider’s note must explicitly connect the current presenting condition to the prior ear laceration. A phrase like “left ear keloid resulting from laceration sustained [date]” or “scarring at prior wound site, left auricle, following foreign body injury” meets this requirement. Generic notes about ear scarring without linking cause do not.
• Current presenting complaint: The note must document what the patient is experiencing today. This is the sequela condition itself (scarring, deformity, pain) and becomes the principal diagnosis. S01.322S explains why that condition exists, not what condition it is.

Payer standards for documentation sufficiency vary. Medicare and most commercial payers follow the ICD-10-CM Official Guidelines framework, but individual payer policies may require additional specificity. Coders should not assume that meeting the minimum guideline threshold guarantees payer acceptance. A strong clinical note that tells the patient’s complete injury story provides the best defence. Practices using secure patient data documentation tools can link historical encounter records directly within the active chart, making the causal chain visible at any future audit.

When documentation is ambiguous, coders should query the provider before submission. Querying is a standard and appropriate step in the coding workflow. Coding from an incomplete record and then correcting after denial costs far more in administrative time than a single targeted provider query. Practices that invest in structured clinical documentation processes see measurably fewer sequela coding errors on the first pass.

Related ICD-10-CM codes for open wound left ear ICD-10

S01.322S sits within a family of closely related codes. Understanding sibling and parent codes reduces mis-selection, particularly when laterality or wound type differs from the documented encounter.

The WHO ICD-10 browser provides global code definitions and is useful for verifying code descriptions when payers reference international classification terminology. For US-specific billing contexts, the CDC/NCHS tabular list governs. When building coding reference materials for your practice, linking related codes in a structured lookup reduces the time a coder spends cross-checking during a busy encounter session. Billing teams managing ENT, emergency, and wound care cases can find the full HIPAA-compliant documentation and billing framework helpful as a governance reference alongside code-specific guides like this one.

Conclusion

Sequela coding errors on injury codes like S01.322S rarely come from misidentifying the code itself. They come from documentation that fails to establish the causal link between the original left ear laceration with foreign body and the current presenting condition. Coders who build that verification into their encounter review process, and who query providers proactively when documentation is incomplete, will see significantly fewer denials on first submission.

Pabau’s claims management software gives billing teams the structured workflow to review encounter type, cross-check documentation elements, and submit sequela claims with the supporting detail payers require. To see how Pabau handles clinical documentation and coding workflows in practice, book a demo with the team.

Continue your research

Need a clinical documentation framework for sequela encounters? Medical forms at your healthcare practice outlines how structured templates reduce coding errors and support accurate encounter-type selection.

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Looking to reduce claim denials across your practice? Compliance management software helps clinical teams build audit-ready documentation workflows that support cleaner first-pass claim submissions.

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