ICD-10 Code S83.241: Other Tear of Medial Meniscus, Right Knee

Key Takeaways

S83.241 is a non-billable header code for other tear of medial meniscus, current injury, right knee – always append a 7th character before submitting a claim.

Three billable child codes exist: S83.241A (initial encounter), S83.241D (subsequent encounter), and S83.241S (sequela) – selecting the wrong one is the most common denial trigger.

Documentation must clearly distinguish this tear from bucket handle (S83.21x), peripheral (S83.22x), and complex (S83.23x) tears to justify the ‘other’ classification.

Pabau’s claims management software supports accurate ICD-10-CM code selection and reduces orthopedic billing errors before claims reach the payer.

Orthopedic and sports medicine coders submit medial meniscus tear claims daily, and the most common denial pattern is straightforward: the header code S83.241 reaches the payer without a 7th character. The claim bounces. Documentation is solid, the procedure was properly performed, but the billing fails on a technicality that takes minutes to fix and days to recover from. ICD-10 Code S83.241 is valid for 2026 and covers other tear of medial meniscus, current injury, right knee, but it requires one of three 7th character extensions before any claim can be processed. This guide covers exactly which character to use, when to use it, and how to document the encounter so the code selection is defensible at audit.

The S83 category covers dislocations and sprains of joints and ligaments of the knee, sitting within the S80-S89 range for injuries to the knee and lower leg. Under Chapter 19 of ICD-10-CM (Injury, poisoning and certain other consequences of external causes, S00-T88), the S83.241 code is classified by the Centers for Medicare and Medicaid Services (CMS) and maintained jointly with the National Center for Health Statistics (NCHS). This reference covers the full code hierarchy, the three billable child codes, documentation requirements, related knee codes, and the ICD-9-CM crosswalk.

ICD-10 Code S83.241: Definition and Clinical Description

ICD-10 Code S83.241 describes a current injury involving a tear of the medial meniscus in the right knee that does not fit the named tear patterns defined elsewhere in the S83.2 category. The “other” classification is clinically significant. It is not a catch-all for uncertain diagnoses – it is the correct code when MRI or surgical findings confirm a medial meniscus tear that is genuinely distinct from a bucket handle tear, a peripheral tear, or a complex tear.

The medial meniscus is a C-shaped fibrocartilage structure on the inner (medial) side of the knee joint. It distributes load, provides stability, and cushions the joint during weight-bearing. Current injury codes in ICD-10-CM indicate that the tear is acute, meaning it occurred from a recent traumatic event rather than from degenerative change over time. Sports medicine software integrated with billing workflows can help orthopedic teams flag the distinction between acute and degenerative meniscal tears at the point of documentation, reducing downstream coding confusion.

The full code hierarchy for S83.241 is:

• S00-T88: Injury, poisoning and certain other consequences of external causes
• S80-S89: Injuries to the knee and lower leg
• S83: Dislocation and sprain of joints and ligaments of knee
• S83.2: Tear of meniscus, current injury
• S83.24: Other tear of medial meniscus, current injury (parent code)
• S83.241: Other tear of medial meniscus, current injury, right knee (non-billable header)

Because S83.241 is a non-billable header code, payers will reject any claim that uses it without appending a valid 7th character. The American Academy of Professional Coders (AAPC) and AHIMA both emphasize that 7th character extensions for traumatic injury codes are required fields, not optional qualifiers.

Billable Child Codes: S83.241A, S83.241D, and S83.241S

Each of the three child codes maps to a distinct phase of patient care. Applying the wrong character is the single most common denial trigger for meniscal tear claims, because payers cross-reference the 7th character against the place of service, procedure codes, and prior claim history for the same patient.

All three codes are valid for the 2026 ICD-10-CM edition, confirmed by the CDC/NCHS ICD-10-CM web tool. S83.241A is confirmed billable across multiple authoritative coding references including icd10data.com and AAPC Codify. S83.241S, while following standard ICD-10-CM 7th character conventions for traumatic injury codes, should be verified against the payer’s LCD policy before submission, as sequela claims often require specific documentation of how the late effect relates to the original injury.

7th Character Selection: When to Use A, D, or S

The 7th character in ICD-10-CM injury codes does not reflect the severity of the injury. It reflects the phase of care. Misapplying the character is a clinical documentation error, not just a billing technicality, and it can create audit liability if the character on the claim contradicts the encounter notes.

Using S83.241A: Initial Encounter

Use S83.241A for every visit where active treatment is being delivered for the acute tear. This includes the emergency department evaluation, the orthopedic surgeon’s first consult, the arthroscopic procedure, and any visit where the clinician is making active treatment decisions about the injury itself. A patient can have multiple visits coded as “A” if active treatment continues across multiple appointments before transitioning to routine follow-up. The physical therapy EMR your clinic uses should allow coders to flag active treatment visits separately from maintenance or follow-up encounters to avoid 7th character errors.

Using S83.241D: Subsequent Encounter

Use S83.241D once active treatment has been established and the patient is receiving routine care during the healing phase. Post-operative check-ups, physical therapy visits during recovery, medication management for pain related to the injury, and dressing changes all qualify. A common mistake: coders switch to “D” too early, applying it to visits where the orthopedic surgeon is still making treatment decisions. When in doubt, the ICD-10-CM Official Guidelines state that “A” is used for active treatment and “D” for routine care during healing. Physiotherapy clinic compliance frameworks often include specific guidance on sequencing injury codes across the care continuum.

Using S83.241S: Sequela

Use S83.241S when the original injury has resolved, but the patient presents with a complication or late effect directly attributable to that past tear. Chronic knee instability, post-surgical fibrosis, or cartilage degradation that developed after the acute meniscal injury are examples. The “S” code is sequenced after the sequela condition itself, not before it. This reversal of sequencing is a frequent documentation error. Confirm with the payer’s local coverage determination before submitting sequela claims, as documentation requirements vary.

Documentation Requirements for ICD-10 Code S83.241

The “other” designation in ICD-10 Code S83.241 creates a specific documentation burden. Auditors reviewing orthopedic claims expect to see that the coder actively considered the named tear types and determined that none applied. Documentation that simply says “medial meniscus tear, right knee” is insufficient. The clinical notes should specify what makes this tear distinct.

• MRI report language: The radiology report should describe the tear pattern. If the radiologist does not use terms like “bucket handle,” “peripheral,” “anterior horn,” or “complex,” document why the tear falls into the “other” category based on surgical or clinical findings.
• Mechanism of injury: Include the mechanism (twisting, pivoting, direct contact) and the timeline of symptoms. “Current injury” requires documentation that the tear is acute, not the result of chronic degeneration.
• Laterality confirmation: Right vs. left must be explicitly stated in the clinical notes, the operative report, and the imaging report. S83.241 specifies the right knee – if the documentation is ambiguous, the claim is vulnerable.
• Surgical findings: When arthroscopy is performed, the operative note should describe what was found and why the surgeon chose a specific approach. This supports both the “other” classification and the encounter type (A vs. D).
• Co-occurring injuries: If ACL involvement (S83.5xx) or MCL damage (S83.4xx) is also present, each must be documented and coded separately. Payers may request medical records to verify that multiple codes are clinically supported.

According to the ICD-10-CM Official Guidelines for Coding and Reporting, published jointly by CMS and NCHS, coders must use the most specific code available. Choosing S83.241 over a named tear type code requires documentation that the tear genuinely does not match the defined patterns. This is not the code to use when the tear type is unknown – in that situation, query the provider before submitting. Using claims management software that flags incomplete documentation before submission helps prevent this denial category entirely.

Related Codes and ICD-9-CM Crosswalk

Understanding where S83.241 sits relative to neighboring codes is essential for accurate coding, particularly when documentation describes features that could overlap with other tear types or when payers request a crosswalk for prior authorization reviews.

Medial Meniscus Tear Code Family (S83.2x)

S83.24x is a residual (“other”) category within the medial meniscus tear family, used when the documented tear pattern does not match the named morphologies captured by S83.21x (bucket handle), S83.22x (peripheral), or S83.23x (complex). S83.241 specifies the right side and S83.242 covers the left. Note that ICD-10-CM does not provide dedicated codes for anatomical horn location (anterior, posterior, or body) – anterior horn tears can fall under any of the S83.2x pattern codes depending on the documented tear morphology, not under S83.24x specifically. Select S83.241 only when the MRI or operative report describes a medial meniscus tear pattern on the right that is genuinely distinct from the bucket handle, peripheral, and complex categories. Learn more about common co-occurring conditions through ICD-10 coding guides for related injury presentations.

Commonly Co-Coded Conditions

Medial meniscus tears frequently occur alongside other knee injuries. When multiple injuries are documented and treated at the same encounter, each requires its own ICD-10-CM code. The most common combinations seen in orthopedic billing include:

• S83.5xx – Sprain of the anterior cruciate ligament (ACL): ACL tears and medial meniscus tears are the most common concurrent injury pair in the knee. Both must be coded when documented.
• S83.4xx – Sprain of the medial collateral ligament (MCL): The “unhappy triad” (ACL + MCL + medial meniscus) requires three separate codes.
• S89.0x – Physeal fracture of upper end of tibia: In adolescent patients with knee trauma, physeal fractures may accompany meniscal tears and require separate coding.
• M23.2xx – Derangement of meniscus due to old tear or injury: Used when the presenting tear is NOT a current injury but instead a chronic or old tear – this is distinct from S83.241 and should not be confused with it.

ICD-9-CM Crosswalk

For practices handling legacy records, payer audits that reference historical data, or prior authorization reviews tied to ICD-9-CM coding periods, the approximate ICD-9-CM equivalent of S83.241A is 836.0 (Tear of medial cartilage or meniscus of knee, current). This crosswalk is confirmed via the icd10data.com conversion tool and is classified as an approximate match, not an exact one. The ICD-10-CM code is more specific in two ways: it identifies the tear as “other” (as opposed to named types) and it specifies laterality (right knee), neither of which was captured in ICD-9-CM 836.0. ICD-9 to ICD-10 crosswalk references are available from multiple coding resources for practices that need to trace historical claim patterns.

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Coding Workflow for Orthopedic and Sports Medicine Clinics

High-volume orthopedic and sports medicine practices need a repeatable coding workflow for knee meniscus cases that catches errors before submission. Denials in this category tend to cluster around the same three issues: missing 7th character, wrong encounter type (A vs. D), and insufficient documentation of tear classification. A structured pre-submission checklist addresses all three.

1. Confirm laterality from three sources: The clinical note, the imaging report, and the procedure note must all reference the right knee. Any discrepancy triggers a documentation query before coding proceeds.
2. Verify tear classification: Pull the MRI or operative report and confirm the tear pattern. If the report language matches bucket handle, peripheral, or complex criteria, use the corresponding named code instead of S83.241. Only use “other” when documentation explicitly rules out the named types or describes a pattern that genuinely differs.
3. Assign the 7th character: Identify the encounter type from the visit note. Active treatment = A. Routine healing follow-up = D. Late effects after resolution = S. Document the rationale in the coding log.
4. Code co-occurring injuries: Search the clinical note for ACL, MCL, or other concurrent knee injuries. Each requires a separate code with its own 7th character reflecting the same encounter type.
5. Validate before submission: Run the claim through your practice management system’s code validator. Practices opening a physiotherapy clinic that handles post-surgical rehab billing should ensure their system flags S83.241 without a suffix as an incomplete code automatically.

According to guidance from the American Academy of Orthopaedic Surgeons (AAOS), accurate injury coding directly supports continuity of care when patients transfer between facilities. A claim that correctly identifies the tear type, laterality, and encounter phase gives the receiving facility an accurate coding baseline, reducing duplication of diagnostic workups. Comprehensive client records that link encounter notes to submitted codes make this transfer process far more reliable for multi-location orthopedic groups.

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Conclusion

Medial meniscus tear claims fail at a predictable point: the header code S83.241 without a 7th character, or the wrong character applied to the wrong phase of care. Both errors are preventable with a clear documentation standard and a pre-submission coding check. ICD-10 Code S83.241 is straightforward once coders understand that the “other” classification is a specific clinical determination, not a default, and that A, D, and S each map to a distinct and verifiable stage of the patient’s treatment journey.

Pabau’s claims management software helps orthopedic and sports medicine teams build these checks into the daily billing workflow, catching incomplete codes and documentation gaps before claims reach the payer. To see how Pabau handles meniscal tear billing and orthopedic practice management, book a demo with the team.

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