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S23.17 vs S29.01

S23.17 (Subluxation and dislocation of T12/L1 thoracic vertebra) compared with S29.01 (Strain of muscle and tendon of thorax), 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 S23.17 lists S29.01 under Excludes2, which marks them as distinct conditions.

Official rule
What is different?

The conditions named.S23.17 is “Subluxation and dislocation of T12/L1 thoracic vertebra”; S29.01 is “Strain of muscle and tendon of thorax”.

Registry fact

Can these codes be reported together?

Yes, when both are documented.S23.17 lists S29.01 under Excludes2: “strain of muscle or tendon of thorax (S29.01-)”. Excludes2 marks distinct conditions that may both be reported when both are documented.

Official ruleGuide: Excludes1 vs Excludes2

Is there an Excludes2 relationship?

Yes.S23.17’s tabular entry: “strain of muscle or tendon of thorax (S29.01-)”. The note covers S29.01.

Official ruleGuide: Excludes1 vs Excludes2

Is one a parent or header code?

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

Registry fact

Nothing found in 3 other checks; 1 check does not apply
Is there an Excludes1 relationship?

None.Neither entry carries an Excludes1 note that names the other code.

Official rule

Is one more specific?

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

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

S23.17
Subluxation and dislocation of T12/L1 thoracic vertebra
↔
S29.01
Strain of muscle and tendon of thorax

What we found

Yes, when both are documented.S23.17 carries an Excludes2 note covering S29.01: “strain of muscle or tendon of thorax (S29.01-)”

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
S23.17

Subluxation and dislocation of T12/L1 thoracic vertebra

S29.01

Strain of muscle and tendon of thorax

StatusDiffers
S23.17
Non-billable header

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

Report instead: S23.170A, S23.170D, S23.170S, S23.171A, S23.171D

S29.01
Non-billable header

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

Report instead: S29.011A, S29.011D, S29.011S, S29.012A, S29.012D

Excludes2Differs
Only at S23.17
  • fracture of thoracic vertebrae (S22.0-)
  • dislocation, sprain of sternoclavicular joint (S43.2, S43.6)
  • strain of muscle or tendon of thorax (S29.01-)
Only at S29.01

No note of its own beyond the shared notes

Shared by both codes (11 notes)
  • burns and corrosions (T20-T32)
  • effects of foreign body in bronchus (T17.5)
  • effects of foreign body in esophagus (T18.1)
  • effects of foreign body in lung (T17.8)
  • effects of foreign body in trachea (T17.4)
  • frostbite (T33-T34)
  • injuries of axilla
  • injuries of clavicle
  • injuries of scapular region
  • injuries of shoulder
  • insect bite or sting, venomous (T63.4)
Code alsoDiffers
S23.17
  • any associated:
  • open wound of thorax (S21.-)
  • spinal cord injury (S24.0-, S24.1-)
  • any associated open wound
S29.01
  • any associated open wound (S21.-)
CategoryDiffers
S23.17

S23 Dislocation and sprain of joints and ligaments of thorax

S29.01

S29 Other and unspecified injuries of thorax

ChapterSame for both

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

IncludesDiffers
Only at S23.17
  • avulsion of joint or ligament of thorax
  • laceration of cartilage, joint or ligament of thorax
  • sprain of cartilage, joint or ligament of thorax
  • traumatic hemarthrosis of joint or ligament of thorax
  • traumatic rupture of joint or ligament of thorax
  • traumatic subluxation of joint or ligament of thorax
  • traumatic tear of joint or ligament of thorax
Only at S29.01

No note of its own beyond the shared notes

Shared by both codes (3 notes)
  • injuries of breast
  • injuries of chest (wall)
  • injuries of interscapular area
7th characterDiffers
S23.17
  • The appropriate 7th character is to be added to each code from category S23
S29.01
  • The appropriate 7th character is to be added to each code from category S29

No Excludes1, 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, each code’s own notes are listed under it, and the notes every code shares are listed once beneath them.

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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