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FY2027 ICD-10-CM reference

S04.30: Injury of trigeminal nerve, unspecified side

By the HCC Buddy Coding Team

The official ICD-10-CM descriptor is Injury of trigeminal nerve, unspecified side. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.

Nonbillable heading. Verified against the official FY2027 order file.

CMS-HCC V28

Not applicable to this nonbillable heading

CMS-HCC V24

Not applicable to this nonbillable heading

ESRD

Not applicable to this nonbillable heading

PACE

Not applicable to this nonbillable heading

RxHCC

Not applicable to this nonbillable heading

HHS-HCC

Not applicable to this nonbillable heading

More specific FY2027 codes

FY2027 Tabular instructions

Instructions below include applicable chapter, section and parent-code notes. Each note identifies where it appears in the official source.

Instructional note

Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code

Source: S00-T88 (chapter, inherited).

Instructional note

code to identify any retained foreign body, if applicable (Z18.-)

Source: S00-T88 (chapter, inherited).

Excludes2

birth trauma (P10-P15)

Source: S00-T88 (chapter, inherited).

Excludes2

obstetric trauma (O70-O71)

Source: S00-T88 (chapter, inherited).

Instructional note

The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.

Source: S00-T88 (chapter, inherited).

Includes

injuries of ear

Source: S00-S09 (section, inherited).

Includes

injuries of eye

Source: S00-S09 (section, inherited).

Includes

injuries of face [any part]

Source: S00-S09 (section, inherited).

Includes

injuries of gum

Source: S00-S09 (section, inherited).

Includes

injuries of jaw

Source: S00-S09 (section, inherited).

Includes

injuries of oral cavity

Source: S00-S09 (section, inherited).

Includes

injuries of palate

Source: S00-S09 (section, inherited).

Includes

injuries of periocular area

Source: S00-S09 (section, inherited).

Includes

injuries of scalp

Source: S00-S09 (section, inherited).

Includes

injuries of temporomandibular joint area

Source: S00-S09 (section, inherited).

Includes

injuries of tongue

Source: S00-S09 (section, inherited).

Includes

injuries of tooth

Source: S00-S09 (section, inherited).

Code also

for any associated infection

Source: S00-S09 (section, inherited).

Excludes2

burns and corrosions (T20-T32)

Source: S00-S09 (section, inherited).

Excludes2

effects of foreign body in ear (T16)

Source: S00-S09 (section, inherited).

Excludes2

effects of foreign body in larynx (T17.3)

Source: S00-S09 (section, inherited).

Excludes2

effects of foreign body in mouth NOS (T18.0)

Source: S00-S09 (section, inherited).

Excludes2

effects of foreign body in nose (T17.0-T17.1)

Source: S00-S09 (section, inherited).

Excludes2

effects of foreign body in pharynx (T17.2)

Source: S00-S09 (section, inherited).

Excludes2

effects of foreign body on external eye (T15.-)

Source: S00-S09 (section, inherited).

Excludes2

frostbite (T33-T34)

Source: S00-S09 (section, inherited).

Excludes2

insect bite or sting, venomous (T63.4)

Source: S00-S09 (section, inherited).

Instructional note

The selection of side should be based on the side of the body being affected

Source: S04 (category, inherited).

Code first

any associated intracranial injury (S06.-)

Source: S04 (category, inherited).

Code also

any associated:

Source: S04 (category, inherited).

Code also

open wound of head (S01.-)

Source: S04 (category, inherited).

Code also

skull fracture (S02.-)

Source: S04 (category, inherited).

Seventh-character instruction

The appropriate 7th character is to be added to each code from category S04

Source: S04 (category, inherited).

Instructional note

initial encounter

Source: S04 (category, inherited).

Instructional note

subsequent encounter

Source: S04 (category, inherited).

Instructional note

sequela

Source: S04 (category, inherited).

Instructional note

Injury of 5th cranial nerve

Source: S04.3 (self, inherited).

Seventh-character definitions

  • A: initial encounter
  • D: subsequent encounter
  • S: sequela

Source: CMS FY2027 Tabular List and Alphabetic Index.

Open Tabular instructions and code details

Compare the FY2027 additions, removals and billable-status changes

What does S04.30 mean in FY2027?

The official ICD-10-CM descriptor is Injury of trigeminal nerve, unspecified side. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.

Is S04.30 billable in FY2027?

The FY2027 order file marks S04.30 as a nonbillable heading. Select a complete billable child code.

Does S04.30 map to an HCC?

Risk-model mapping is not applicable to this nonbillable heading. Check a complete billable child code.

Source: CMS FY2027 ICD-10-CM order file. Read the FY2027 Official Guidelines.

Review the FY2026 April edition