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G52.0 vs H93.3

G52.0 (Disorders of olfactory nerve) compared with H93.3 (Disorders of acoustic nerve), from the official CMS tabular data.

Summary

These codes can be reported together when both conditions are documented, because G52.0 lists H93.3 under Excludes2, which marks them as distinct conditions.

Official rule
What is different?

Title wording, billing status and chapter.The titles differ in one word, “olfactory” (G52.0) versus “acoustic” (H93.3): G52.0 is “Disorders of olfactory nerve”; H93.3 is “Disorders of acoustic nerve”. H93.3 is a non-billable header; G52.0 is billable. G52.0 sits in G00-G99 — Diseases of the Nervous System (G00-G99); H93.3 in H60-H95 — Diseases of the Ear and Mastoid Process (H60-H95).

Registry fact

Can these codes be reported together?

Yes, when both are documented.G52.0 lists H93.3 under Excludes2: “disorders of acoustic [8th] nerve (H93.3)”. 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. G52.0 carries 5 Excludes1 notes and H93.3 carries 2 Excludes1 notes covering other codes; the side-by-side table quotes them.

Official rule

Is there an Excludes2 relationship?

Yes.G52.0’s tabular entry: “disorders of acoustic [8th] nerve (H93.3)”. The note covers H93.3.

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.H93.3 is a non-billable header, but G52.0 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

G52.0
Disorders of olfactory nerve
↔
H93.3
Disorders of acoustic nerve

What we found

Yes, when both are documented.G52.0 carries an Excludes2 note covering H93.3: “disorders of acoustic [8th] nerve (H93.3)”

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

G52.0Disorders of olfactory nerveH93.3Disorders of acoustic nerve
Billing statusBillableNon-billable header

Report instead: H93.3X1, H93.3X2, H93.3X3, H93.3X9

ClassificationG00-G99 — Diseases of the Nervous System (G00-G99)H60-H95 — Diseases of the Ear and Mastoid Process (H60-H95)
DefinitionDisorders of olfactory nerve is a billable ICD-10-CM diagnosis code (G52.0).Disorders of acoustic nerve is a non-billable ICD-10-CM category code (H93.3).
Includes
Disorders of 1st cranial nerve
Disorder of 8th cranial nerve
Excludes1
current traumatic nerve, nerve root and plexus disorders - see Injury, nerve by body region
neuralgia NOS (M79.2)
neuritis NOS (M79.2)
peripheral neuritis in pregnancy (O26.82-)
radiculitis NOS (M54.1-)
acoustic neuroma (D33.3)
syphilitic acoustic neuritis (A52.15)
Excludes2
disorders of acoustic [8th] nerve (H93.3)
disorders of optic [2nd] nerve (H46, H47.0)
paralytic strabismus due to nerve palsy (H49.0-H49.2)
—

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