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G71 vs M62.81

G71 (Primary disorders of muscles) compared with M62.81 (Muscle weakness (generalized)), from the official CMS tabular data.

Summary

These codes can be reported together when both conditions are documented, because M62.81 lists G71 under Excludes2, which marks them as distinct conditions.

Official rule
What is different?

The conditions named, billing status and chapter.G71 is “Primary disorders of muscles”; M62.81 is “Muscle weakness (generalized)”. G71 is a non-billable header; M62.81 is billable. G71 sits in G00-G99 — Diseases of the Nervous System (G00-G99); M62.81 in M00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99).

Registry fact

Can these codes be reported together?

Yes, when both are documented.M62.81 lists G71 under Excludes2: “muscular dystrophies and myopathies (G71-G72)”. 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. M62.81 carries 13 Excludes1 notes covering other codes; the side-by-side table quotes them.

Official rule

Is there an Excludes2 relationship?

Yes.M62.81’s tabular entry: “muscular dystrophies and myopathies (G71-G72)”. The note covers G71.

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.G71 is a non-billable header, but M62.81 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

M62.81
Muscle weakness (generalized)
↔
G71
Primary disorders of muscles

What we found

Yes, when both are documented.M62.81 carries an Excludes2 note covering G71: “muscular dystrophies and myopathies (G71-G72)”

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

G71Primary disorders of musclesM62.81Muscle weakness (generalized)
Billing statusNon-billable header

Report instead: G71.00, G71.01, G71.02, G71.031, G71.032

Billable
ClassificationG00-G99 — Diseases of the Nervous System (G00-G99)M00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99)
DefinitionPrimary disorders of muscles is a non-billable ICD-10-CM category code (G71).Muscle weakness (generalized) is a billable ICD-10-CM diagnosis code (M62.81).
Excludes1—
muscle weakness in sarcopenia (M62.84)
alcoholic myopathy (G72.1)
cramp and spasm (R25.2)
drug-induced myopathy (G72.0)
myalgia (M79.1-)
stiff-man syndrome (G25.82)
dermatopolymyositis (M33.-)
myopathy in amyloidosis (E85.-)
myopathy in polyarteritis nodosa (M30.0)
myopathy in rheumatoid arthritis (M05.32)
myopathy in scleroderma (M34.-)
myopathy in Sjögren's syndrome (M35.03)
myopathy in systemic lupus erythematosus (M32.-)
Excludes2
arthrogryposis multiplex congenita (Q74.3)
metabolic disorders (E70-E88)
myositis (M60.-)
nontraumatic hematoma of muscle (M79.81)
muscular dystrophies and myopathies (G71-G72)

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 (FY2027). A coding-rule comparison, not billing advice: payer-specific edits and medical-necessity policy are outside its scope. All data sources