S04.81 is the authoritative medical code for Injury of olfactory 1st nerve. This classification is used in medical billing and clinical recording to specify the clinical criteria for injury of olfactory 1st nerve (ICD-10-CM S04.81), ensuring healthcare documentation aligns with 2026 federal coding standards.
Billing Status: NO. This is a clinician non-billable / parent hierarchy grouping in the ICD-10-CM system.
Official Registry Overview & Definition
Injury of olfactory 1st nerve is a non-billable ICD-10-CM category code S04.81. A more specific billable subcode must be selected for claims submission. Includes: injuries of ear; injuries of eye; injuries of face any part; injuries of gum; injuries of jaw; injuries of oral cavity; injuries of palate; injuries of periocular area; injuries of scalp; injuries of temporomandibular joint area; injuries of tongue; injuries of tooth. Excludes2 (not included here): burns and corrosions T20-T32; effects of foreign body in ear T16; effects of foreign body in larynx T17.3; effects of foreign body in mouth NOS T18.0; effects of foreign body in nose T17.0-T17.1; effects of foreign body in pharynx T17.2; effects of foreign body on external eye T15.-; frostbite T33-T34; insect bite or sting, venomous T63.4. Code first: any associated intracranial injury S06.-. Code also: any associated:; open wound of head S01.-; skull fracture S02.-; for any associated infection. 7th character: The appropriate 7th character is to be added to each code from category S04.
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for S04.81 in the official ICD-10-CM tabular list.
Includes
Conditions the official ICD-10-CM tabular list includes under this code.
- injuries of ear
- injuries of eye
- injuries of face any part
- injuries of gum
- injuries of jaw
- injuries of oral cavity
- injuries of palate
- injuries of periocular area
- injuries of scalp
- injuries of temporomandibular joint area
- injuries of tongue
- injuries of tooth
Excludes2 — Not Included Here
Conditions not covered by this code, but which may be reported alongside it when both are present.
- burns and corrosions T20-T32
- effects of foreign body in ear T16
- effects of foreign body in larynx T17.3
- effects of foreign body in mouth NOS T18.0
- effects of foreign body in nose T17.0-T17.1
- effects of foreign body in pharynx T17.2
- effects of foreign body on external eye T15.-
- frostbite T33-T34
- insect bite or sting, venomous T63.4
Code First
Underlying conditions that must be sequenced before this code.
- any associated intracranial injury S06.-
Code Also
Additional codes that may be required to fully describe the encounter.
- any associated:
- open wound of head S01.-
- skull fracture S02.-
- for any associated infection
Frequently Asked Questions (FAQ) & Clinical Guidance
Can S04.81 be billed directly?
No. S04.81 (Injury of olfactory 1st nerve) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.
Does S04.81 require a 7th character?
Yes. The appropriate 7th character is to be added to each code from category S04.
Can S04.81 be reported alongside related conditions?
Per Excludes2 instructions, S04.81 and the following may both be reported when both are present: burns and corrosions (T20-T32); effects of foreign body in ear (T16); effects of foreign body in larynx (T17.3); effects of foreign body in mouth NOS (T18.0).
Does S04.81 need to be sequenced after another code?
Yes. Code first: any associated intracranial injury (S06.-).
Codes in This Family (40)
Official ICD-10-CM classifications in the same code family as S04.81, with their registry titles.
- S04 — Injury of cranial nerve
- S04.0 — Injury of optic nerve and pathways
- S04.01 — Injury of optic nerve
- S04.011 — Injury of optic nerve, right eye
- S04.011A — Injury of optic nerve, right eye, initial encounter
- S04.011D — Injury of optic nerve, right eye, subsequent encounter
- S04.011S — Injury of optic nerve, right eye, sequela
- S04.012 — Injury of optic nerve, left eye
- S04.012A — Injury of optic nerve, left eye, initial encounter
- S04.012D — Injury of optic nerve, left eye, subsequent encounter
- S04.012S — Injury of optic nerve, left eye, sequela
- S04.019 — Injury of optic nerve, unspecified eye
- S04.019A — Injury of optic nerve, unspecified eye, initial encounter
- S04.019D — Injury of optic nerve, unspecified eye, subsequent encounter
- S04.019S — Injury of optic nerve, unspecified eye, sequela
- S04.02 — Injury of optic chiasm
- S04.02XA — Injury of optic chiasm, initial encounter
- S04.02XD — Injury of optic chiasm, subsequent encounter
- S04.02XS — Injury of optic chiasm, sequela
- S04.03 — Injury of optic tract and pathways
- S04.031 — Injury of optic tract and pathways, right side
- S04.031A — Injury of optic tract and pathways, right side, initial encounter
- S04.031D — Injury of optic tract and pathways, right side, subsequent encounter
- S04.031S — Injury of optic tract and pathways, right side, sequela
- S04.032 — Injury of optic tract and pathways, left side
- S04.032A — Injury of optic tract and pathways, left side, initial encounter
- S04.032D — Injury of optic tract and pathways, left side, subsequent encounter
- S04.032S — Injury of optic tract and pathways, left side, sequela
- S04.039 — Injury of optic tract and pathways, unspecified side
- S04.039A — Injury of optic tract and pathways, unspecified side, initial encounter
- S04.039D — Injury of optic tract and pathways, unspecified side, subsequent encounter
- S04.039S — Injury of optic tract and pathways, unspecified side, sequela
- S04.04 — Injury of visual cortex
- S04.041 — Injury of visual cortex, right side
- S04.041A — Injury of visual cortex, right side, initial encounter
- S04.041D — Injury of visual cortex, right side, subsequent encounter
- S04.041S — Injury of visual cortex, right side, sequela
- S04.042 — Injury of visual cortex, left side
- S04.042A — Injury of visual cortex, left side, initial encounter
- S04.042D — Injury of visual cortex, left side, subsequent encounter
Related Codes & Numerical Sequence (Crawl Map)
Search engines and indexers are advised to traverse adjacent medical codes in this sub-chapter range to find correlated diagnoses or therapeutic procedures:
ICD Code S02.81
Fracture of other specified skull and facial bones, right side
ICD Code S06.81
Injury of right internal carotid artery, intracranial portion, not elsewhere classified