Skip to main content

M23 vs S83.22

M23 (Internal derangement of knee) compared with S83.22 (Peripheral tear of medial meniscus, current injury), from the official CMS tabular data.

Summary

These codes can be reported together when both conditions are documented, because M23 lists S83.22 under Excludes2, which marks them as distinct conditions.

Official rule
What is different?

The conditions named and chapter.M23 is “Internal derangement of knee”; S83.22 is “Peripheral tear of medial meniscus, current injury”. M23 sits in M00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99); S83.22 in S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88).

Registry fact

Can these codes be reported together?

Yes, when both are documented.M23 lists S83.22 under Excludes2: “current injury - see injury of knee and lower leg (S80-S89)”. Excludes2 marks distinct conditions that may both be reported when both are documented.

Official ruleGuide: Excludes1 vs Excludes2

Is there an Excludes1 relationship?

None.Neither entry carries an Excludes1 note that names the other code. M23 carries 3 Excludes1 notes and S83.22 carries 1 Excludes1 note covering other codes; the side-by-side table quotes them.

Official rule

Is there an Excludes2 relationship?

Yes.M23’s tabular entry: “current injury - see injury of knee and lower leg (S80-S89)”. The note covers S83.22.

Official ruleGuide: Excludes1 vs Excludes2

Is one more specific?

Not comparable.The codes sit in different categories; specificity is only comparable within one category.

Is one a parent or header code?

Both are headers.Both are non-billable headers, and neither contains the other.

Registry fact

Are there sequencing instructions?

None.Neither entry carries a Code First or Use Additional Code note that names the other.

Official rule

Are there other coding relationships?

None found.No laterality, encounter-phase, Table of Neoplasms, Table of Drugs and Chemicals, or history-versus-active-disease relationship links these codes.

MedCoder-derived

Official rule: a tabular instructional note or a section of the ICD-10-CM Official Guidelines, quoted as published. Registry fact: the codes’ own published attributes (titles, billable status, position in the hierarchy, code set). MedCoder-derived: a reading MedCoder computes from those facts; it is not itself a rule. How to read the labels

Can these codes be reported together?

Informational

Excludes2 relationship

M23
Internal derangement of knee
↔
S83.22
Peripheral tear of medial meniscus, current injury

What we found

Yes, when both are documented.M23 carries an Excludes2 note covering S83.22: “current injury - see injury of knee and lower leg (S80-S89)”

Excludes2 marks distinct conditions — both may be reported when both are documented.

What to review

Report both only when the documentation supports both conditions; otherwise report the one documented.

Guide: Excludes1 vs Excludes2Check these on a claim

Why it matters

An Excludes2 note means the excluded condition is not part of the code above it, but a patient can have both. Report both when both are documented.

Source / rule

CMS ICD-10-CM tabular instructional notes

Official guidance behind these answers

  • Section I.A.12.b — Excludes2 · applies to: Excludes2

    A type 2 Excludes note represents “Not included here.” An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.

    ICD-10-CM Official Guidelines FY2026

Quoted from the ICD-10-CM Official Guidelines for Coding and Reporting in effect for the release shown. The tabular notes above are the code-level instruction; these sections are the convention that says how such a note is applied. Source document (CMS PDF) · Release and checksum

Side by side

M23Internal derangement of kneeS83.22Peripheral tear of medial meniscus, current injury
Billing statusNon-billable header

Report instead: M23.000, M23.001, M23.002, M23.003, M23.004

Non-billable header

Report instead: S83.221A, S83.221D, S83.221S, S83.222A, S83.222D

ClassificationM00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99)S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)
DefinitionInternal derangement of knee is a non-billable ICD-10-CM category code (M23).Peripheral tear of medial meniscus, current injury is a non-billable ICD-10-CM category code (S83.22).
7th character—The appropriate 7th character is to be added to each code from category S83
Includes—
avulsion of joint or ligament of knee
laceration of cartilage, joint or ligament of knee
sprain of cartilage, joint or ligament of knee
traumatic hemarthrosis of joint or ligament of knee
Excludes1
ankylosis (M24.66)
deformity of knee (M21.-)
osteochondritis dissecans (M93.2)
old bucket-handle tear (M23.2)
Excludes2
current injury - see injury of knee and lower leg (S80-S89)
recurrent dislocation or subluxation of joints (M24.4)
recurrent dislocation or subluxation of patella (M22.0-M22.1)
joints of the spine (M40-M54)
derangement of patella (M22.0-M22.3)
injury of patellar ligament (tendon) (S76.1-)
internal derangement of knee (M23.-)
old dislocation of knee (M24.36)
pathological dislocation of knee (M24.36)
recurrent dislocation of knee (M22.0)
strain of muscle, fascia and tendon of lower leg (S86.-)
burns and corrosions (T20-T32)
frostbite (T33-T34)
injuries of ankle and foot, except fracture of ankle and malleolus (S90-S99)
insect bite or sting, venomous (T63.4)
Code also—
any associated open wound

Notes are the code’s own tabular entry, quoted as published. A note that names the other code is the one the verdict above rests on.

Edit this comparisonCheck a whole claim

Derived from the official CMS ICD-10-CM tabular data (FY2026). A coding-rule comparison, not billing advice: payer-specific edits and medical-necessity policy are outside its scope. All data sources