S04.9XXS — Injury of unspecified cranial nerve, sequela

BillableUnspecified

Is S04.9XXS billable?

Yes, but S04.9XXS is an unspecified code. S04.9XXS is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, S04.9XXS is an unspecified or catch-all code. Payers apply additional scrutiny to unspecified codes and many deny them when the medical record supports a more specific option, so check the documentation before selecting S04.9XXS — the more specific alternatives are listed below.

More specific alternatives

S04.9XXS at a glance

Code	S04.9XXS
Description	Injury of unspecified cranial nerve, sequela
Billable	Yes
Code set	ICD-10-CM FY2027
Valid for encounters	October 1, 2026 – September 30, 2027
7th character "S"	sequela

What does the 7th character "S" mean in S04.9XXS?

In S04.9XXS, the 7th character S means sequela. The 7th character is required for S04.9XXS to be a valid, complete code.

Same condition, different episode of care — switch the 7th character:

Which MS-DRGs does S04.9XXS group to?

S04.9XXS sits in MDC 01 and helps define the logic of 3 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.

091Other Disorders of Nervous System with MCCmedical
092Other Disorders of Nervous System with CCmedical
093Other Disorders of Nervous System without CC/MCCmedical

How is S04.9XXS listed in the Alphabetic Index?

The Alphabetic Index lists these routes under S04.9, the nearest indexed parent of S04.9XXS. Use them to find the family, then select the specific code.

Injury › nerve NEC › cranial
Injury › nerve NEC › cranial › contusion
Injury › nerve NEC › cranial › laceration
Injury › nerve NEC › cranial › specified › type NEC

Code first — inherited from S04

The underlying condition below must be sequenced before S04.9XXS. S04.9XXS describes a manifestation and cannot be the principal or first-listed diagnosis.

any associated intracranial injury (S06.-)

Use additional code — inherited from Chapter 19

Report an additional code alongside S04.9XXS to fully describe the condition. S04.9XXS is sequenced first.

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

Excludes2 — not included here — inherited from Chapter 19

The conditions below are not part of S04.9XXS, but a patient may have both at the same time. When documentation supports it, S04.9XXS and the excluded code may both be reported.

birth trauma (P10-P15)
obstetric trauma (O70-O71)

Excludes2 — not included here — inherited from S00-S09

The conditions below are not part of S04.9XXS, but a patient may have both at the same time. When documentation supports it, S04.9XXS and the excluded code may both be reported.

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 also — inherited from S00-S09

Two codes may be needed to describe the condition fully. Whether S04.9XXS is sequenced first depends on the reason for the encounter.

for any associated infection

Code also — inherited from S04

Two codes may be needed to describe the condition fully. Whether S04.9XXS is sequenced first depends on the reason for the encounter.

any associated:
open wound of head (S01.-)
skull fracture (S02.-)

How long has S04.9XXS existed?

S04.9XXS has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.

Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.