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M24.36 vs S83.00

M24.36 (Pathological dislocation of knee, not elsewhere classified) compared with S83.00 (Unspecified subluxation and dislocation of patella), from the official CMS tabular data.

Current data releases:ICD-10-CM FY2027 · ICD-10-PCS FY2027 · HCPCS October 2026 · MS-DRG v44 · Medicare Code Editor v44.0 · NCCI PTP Q4 2026 · MUE Q4 2026 · NCD code lists 2026-01 · LCD export September 28, 2026 · All releases and sources

Summary

These codes can be reported together when both conditions are documented, because S83.00 lists M24.36 under Excludes2, which marks them as distinct conditions.

Official rule
What is different?

The conditions named and chapter.M24.36 is “Pathological dislocation of knee, not elsewhere classified”; S83.00 is “Unspecified subluxation and dislocation of patella”. M24.36 sits in M00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99); S83.00 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.S83.00 lists M24.36 under Excludes2: “old dislocation of knee (M24.36)”. 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. M24.36 carries 4 Excludes1 notes covering other codes; the side-by-side table quotes them.

Official rule

Is there an Excludes2 relationship?

Yes.S83.00’s tabular entry: “old dislocation of knee (M24.36)”. The note covers M24.36.

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

S83.00
Unspecified subluxation and dislocation of patella
↔
M24.36
Pathological dislocation of knee, not elsewhere classified

What we found

Yes, when both are documented.S83.00 carries an Excludes2 note covering M24.36: “old dislocation of knee (M24.36)”

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 FY2027

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

Similar descriptions do not make codes interchangeable. The documentation and the official instructions decide which code applies.

Official descriptionDiffers
M24.36

Pathological dislocation of knee, not elsewhere classified

S83.00

Unspecified subluxation and dislocation of patella

StatusDiffers
M24.36
Non-billable header

A header is not reported on a claim; a code beneath it is.

Report instead: M24.361, M24.362, M24.369

S83.00
Non-billable header

A header is not reported on a claim; a code beneath it is.

Report instead: S83.001A, S83.001D, S83.001S, S83.002A, S83.002D

Excludes1Differs
M24.36
  • congenital dislocation or displacement of joint- see congenital malformations and deformations of the musculoskeletal system (Q65-Q79)
  • current injury - see injury of joints and ligaments by body region
  • recurrent dislocation of joint (M24.4-)
  • current injury - see injury of joint by body region
S83.00

None at this code

Excludes2Differs
M24.36
  • ganglion (M67.4)
  • snapping knee (M23.8-)
  • temporomandibular joint disorders (M26.6-)
  • joints of the spine (M40-M54)
S83.00
  • 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 alsoDiffers
M24.36

None at this code

S83.00
  • any associated open wound
CategoryDiffers
M24.36

M24 Other specific joint derangements

S83.00

S83 Dislocation and sprain of joints and ligaments of knee

ChapterDiffers
M24.36

M00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99)

S83.00

S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)

IncludesDiffers
M24.36

None at this code

S83.00
  • 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
7th characterDiffers
M24.36

None at this code

S83.00
  • The appropriate 7th character is to be added to each code from category S83

No Code first and Use additional code note at either code.

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. In a row that differs, notes every code shares are dimmed.

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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