G52.0 Disorders of olfactory nerve

The ICD-10-CM code for Disorders of olfactory nerve is G52.0 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

6: Diseases of the nervous system (G00-G99)

Section

G50-G59: Nerve, nerve root and plexus disorders (G50-G59)

Category G52

8 codes (7 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to G52.0:

• Neuritis (rheumatoid) › olfactory nerve
• Neuralgia, neuralgic (acute) › nose
• Neuralgia, neuralgic (acute) › olfactory
• Lesion (s) (nontraumatic) › cranial nerve › first
• Neuritis (rheumatoid) › cranial nerve › first or olfactory
• Compression › cranial nerve › first
• Disorder (of) › nerve › olfactory
• Atrophy, atrophic (of) › nerve › olfactory

Inclusion Terms

• Disorders of 1st cranial nerve

U.S. Hospital Utilization

• An estimated 75 U.S. inpatient stays in 2023 included G52.0 among the documented diagnoses.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

Official Coding Guidelines

Dominant/nondominant side (TOC entry)

a. Dominant/nondominant side ................................................................................................. 45

Pain - Category G89 (TOC entry)

b. Pain - Category G89.............................................................................................................. 45

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool
• AHRQ — HCUP National Inpatient Sample, Frequencies by Diagnosis Code (2016–2023)