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M23.8 vs M24.519

M23.8 (Other internal derangements of knee) compared with M24.519 (Contracture, unspecified shoulder), from the official CMS tabular data.

Summary

These codes can be reported together when both conditions are documented, because M24.519 lists M23.8 under Excludes2, which marks them as distinct conditions.

Official rule
What is different?

The conditions named and billing status.M23.8 is “Other internal derangements of knee”; M24.519 is “Contracture, unspecified shoulder”. M23.8 is a non-billable header; M24.519 is billable.

Registry fact

Can these codes be reported together?

Yes, when both are documented.M24.519 lists M23.8 under Excludes2: “snapping knee (M23.8-)”. 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. M23.8 carries 3 Excludes1 notes and M24.519 carries 4 Excludes1 notes covering other codes; the side-by-side table quotes them.

Official rule

Is there an Excludes2 relationship?

Yes.M24.519’s tabular entry: “snapping knee (M23.8-)”. The note covers M23.8.

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?

One is a header.M23.8 is a non-billable header, but M24.519 is not one of its subdivisions.

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

M24.519
Contracture, unspecified shoulder
↔
M23.8
Other internal derangements of knee

What we found

Yes, when both are documented.M24.519 carries an Excludes2 note covering M23.8: “snapping knee (M23.8-)”

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

M23.8Other internal derangements of kneeM24.519Contracture, unspecified shoulder
Billing statusNon-billable header

Report instead: M23.8X1, M23.8X2, M23.8X9

Billable
ClassificationM00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99)M00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99)
DefinitionOther internal derangements of knee is a non-billable ICD-10-CM category code (M23.8).Contracture, unspecified shoulder is a billable ICD-10-CM diagnosis code (M24.519).
Includes
Laxity of ligament of knee
Snapping knee
—
Excludes1
ankylosis (M24.66)
deformity of knee (M21.-)
osteochondritis dissecans (M93.2)
contracture of muscle without contracture of joint (M62.4-)
contracture of tendon (sheath) without contracture of joint (M62.4-)
Dupuytren's contracture (M72.0)
current injury - see injury of joint by body region
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)
acquired deformities of limbs (M20-M21)
ganglion (M67.4)
snapping knee (M23.8-)
temporomandibular joint disorders (M26.6-)
joints of the spine (M40-M54)

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.

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Derived from the official CMS ICD-10-CM tabular data (FY2027). A coding-rule comparison, not billing advice: payer-specific edits and medical-necessity policy are outside its scope. All data sources