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M48.4 vs M84.372S

M48.4 (Fatigue fracture of vertebra) compared with M84.372S (Stress fracture, left ankle, sequela), 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 M84.372S lists M48.4 under Excludes2, which marks them as distinct conditions.

Official rule
What is different?

The conditions named and billing status.M48.4 is “Fatigue fracture of vertebra”; M84.372S is “Stress fracture, left ankle, sequela”. M48.4 is a non-billable header; M84.372S is billable.

Registry fact

Can these codes be reported together?

Yes, when both are documented.M84.372S lists M48.4 under Excludes2: “stress fracture of vertebra (M48.4-)”. 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. M48.4 carries 5 Excludes1 notes and M84.372S carries 3 Excludes1 notes covering other codes; the side-by-side table quotes them.

Official rule

Is there an Excludes2 relationship?

Yes.M84.372S’s tabular entry: “stress fracture of vertebra (M48.4-)”. The note covers M48.4.

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.M48.4 is a non-billable header, but M84.372S 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

M84.372S
Stress fracture, left ankle, sequela
↔
M48.4
Fatigue fracture of vertebra

What we found

Yes, when both are documented.M84.372S carries an Excludes2 note covering M48.4: “stress fracture of vertebra (M48.4-)”

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
M48.4

Fatigue fracture of vertebra

M84.372S

Stress fracture, left ankle, sequela

StatusDiffers
M48.4
Non-billable header

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

Report instead: M48.40XA, M48.40XD, M48.40XG, M48.40XS, M48.41XA

M84.372S
Billable
Excludes1Differs
M48.4
  • pathological fracture NOS (M84.4-)
  • pathological fracture of vertebra due to neoplasm (M84.58)
  • pathological fracture of vertebra due to other diagnosis (M84.68)
  • pathological fracture of vertebra due to osteoporosis (M80.-)
  • traumatic fracture of vertebrae (S12.0-S12.3-, S22.0-, S32.0-)
M84.372S
  • pathological fracture NOS (M84.4.-)
  • pathological fracture due to osteoporosis (M80.-)
  • traumatic fracture (S12.-, S22.-, S32.-, S42.-, S52.-, S62.-, S72.-, S82.-, S92.-)
Excludes2Differs
M48.4

None at this code

M84.372S
  • personal history of (healed) stress (fatigue) fracture (Z87.312)
  • stress fracture of vertebra (M48.4-)
  • traumatic fracture of bone-see fracture, by site
Use additional codeDiffers
M48.4

None at this code

M84.372S
  • external cause code(s) to identify the cause of the stress fracture
CategoryDiffers
M48.4

M48 Other spondylopathies

M84.372S

M84 Disorder of continuity of bone

ChapterSame for both

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

IncludesDiffers
M48.4
  • Stress fracture of vertebra
M84.372S

None at this code

7th characterDiffers
M48.4
  • The appropriate 7th character is to be added to each code from subcategory M48.4:
M84.372S
  • The appropriate 7th character is to be added to each code from subcategory M84.3:

No Code first and Code also 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