ICD-10 · PDGM grouping
S04 Injury of cranial nerve
All 114 codes in the S04 family, with the PDGM clinical group, comorbidity subgroup and primary-position rule CMS assigns, read from the CMS grouper crosswalk v07.2.26 and the CDC FY2027 code file.
ICD-10-CM FY2027 · CMS grouper v07.2.26
Codes in family
114
Can lead a claim
75
Cannot lead a claim
39
What CMS assigns to S04
75 of the 114 codes group to Neuro Rehabilitation (54) and MMTA - Other (21); 39 are assigned no clinical group. None of the 114 is assigned a comorbidity subgroup. 75 of the 114 can lead a claim. CMS attaches a code-first note to all 114.
Code first
CMS grouper convention 163, on all 114 codes. Code first:
- any associated intracranial injury (S06.-)
Every code in S04
Descriptions are CDC’s FY2027 wording; where CMS’s grouper abbreviates one, its form is shown beneath.
| Code | Description | Primary position | Clinical group | Comorbidity subgroup |
|---|---|---|---|---|
| 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 | Can lead a claim, code first applies | A | None |
| S04.011D | Injury of optic nerve, right eye, subsequent encounter | Can lead a claim, code first applies | A | None |
| S04.011S | Injury of optic nerve, right eye, sequela | Can lead a claim, code first applies | A | None |
| S04.012 Injury of optic nerve, left eye | ||||
| S04.012A | Injury of optic nerve, left eye, initial encounter | Can lead a claim, code first applies | A | None |
| S04.012D | Injury of optic nerve, left eye, subsequent encounter | Can lead a claim, code first applies | A | None |
| S04.012S | Injury of optic nerve, left eye, sequela | Can lead a claim, code first applies | A | None |
| S04.019 Injury of optic nerve, unspecified eye | ||||
| S04.019A | Injury of optic nerve, unspecified eye, initial encounter | Cannot lead a claimUnspecified diagnosis code not acceptable as principal diagnosis since there is a more specific code available that would further accurately identify the condition | None | None |
| S04.019D | Injury of optic nerve, unspecified eye, subsequent encounter | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| S04.019S | Injury of optic nerve, unspecified eye, sequela | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| S04.02 Injury of optic chiasm | ||||
| S04.02XA | Injury of optic chiasm, initial encounter | Can lead a claim, code first applies | A | None |
| S04.02XD | Injury of optic chiasm, subsequent encounter | Can lead a claim, code first applies | A | None |
| S04.02XS | Injury of optic chiasm, sequela | Can lead a claim, code first applies | A | None |
| 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 encounterCMS: Injury of optic tract and pathways, right side, init | Can lead a claim, code first applies | A | None |
| S04.031D | Injury of optic tract and pathways, right side, subsequent encounterCMS: Injury of optic tract and pathways, right side, subs | Can lead a claim, code first applies | A | None |
| S04.031S | Injury of optic tract and pathways, right side, sequela | Can lead a claim, code first applies | A | None |
| S04.032 Injury of optic tract and pathways, left side | ||||
| S04.032A | Injury of optic tract and pathways, left side, initial encounterCMS: Injury of optic tract and pathways, left side, init | Can lead a claim, code first applies | A | None |
| S04.032D | Injury of optic tract and pathways, left side, subsequent encounterCMS: Injury of optic tract and pathways, left side, subs | Can lead a claim, code first applies | A | None |
| S04.032S | Injury of optic tract and pathways, left side, sequela | Can lead a claim, code first applies | A | None |
| S04.039 Injury of optic tract and pathways, unspecified side | ||||
| S04.039A | Injury of optic tract and pathways, unspecified side, initial encounterCMS: Injury of optic tract and pathways, unspecified side, init | Cannot lead a claimUnspecified diagnosis code not acceptable as principal diagnosis since there is a more specific code available that would further accurately identify the condition | None | None |
| S04.039D | Injury of optic tract and pathways, unspecified side, subsequent encounterCMS: Injury of optic tract and pathways, unspecified side, subs | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| S04.039S | Injury of optic tract and pathways, unspecified side, sequelaCMS: Injury of optic tract and pathways, unsp side, sequela | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| S04.04 Injury of visual cortex | ||||
| S04.041 Injury of visual cortex, right side | ||||
| S04.041A | Injury of visual cortex, right side, initial encounter | Can lead a claim, code first applies | A | None |
| S04.041D | Injury of visual cortex, right side, subsequent encounter | Can lead a claim, code first applies | A | None |
| S04.041S | Injury of visual cortex, right side, sequela | Can lead a claim, code first applies | A | None |
| S04.042 Injury of visual cortex, left side | ||||
| S04.042A | Injury of visual cortex, left side, initial encounter | Can lead a claim, code first applies | A | None |
| S04.042D | Injury of visual cortex, left side, subsequent encounter | Can lead a claim, code first applies | A | None |
| S04.042S | Injury of visual cortex, left side, sequela | Can lead a claim, code first applies | A | None |
| S04.049 Injury of visual cortex, unspecified side | ||||
| S04.049A | Injury of visual cortex, unspecified side, initial encounter | Cannot lead a claimUnspecified diagnosis code not acceptable as principal diagnosis since there is a more specific code available that would further accurately identify the condition | None | None |
| S04.049D | Injury of visual cortex, unspecified side, subsequent encounterCMS: Injury of visual cortex, unspecified side, subs | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| S04.049S | Injury of visual cortex, unspecified side, sequela | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| S04.1 Injury of oculomotor nerve | ||||
| S04.10 Injury of oculomotor nerve, unspecified side | ||||
| S04.10XA | Injury of oculomotor nerve, unspecified side, initial encounterCMS: Injury of oculomotor nerve, unspecified side, init encntr | Cannot lead a claimUnspecified diagnosis code not acceptable as principal diagnosis since there is a more specific code available that would further accurately identify the condition | None | None |
| S04.10XD | Injury of oculomotor nerve, unspecified side, subsequent encounterCMS: Injury of oculomotor nerve, unspecified side, subs encntr | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| S04.10XS | Injury of oculomotor nerve, unspecified side, sequela | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| S04.11 Injury of oculomotor nerve, right side | ||||
| S04.11XA | Injury of oculomotor nerve, right side, initial encounter | Can lead a claim, code first applies | B | None |
| S04.11XD | Injury of oculomotor nerve, right side, subsequent encounter | Can lead a claim, code first applies | B | None |
| S04.11XS | Injury of oculomotor nerve, right side, sequela | Can lead a claim, code first applies | B | None |
| S04.12 Injury of oculomotor nerve, left side | ||||
| S04.12XA | Injury of oculomotor nerve, left side, initial encounter | Can lead a claim, code first applies | B | None |
| S04.12XD | Injury of oculomotor nerve, left side, subsequent encounter | Can lead a claim, code first applies | B | None |
| S04.12XS | Injury of oculomotor nerve, left side, sequela | Can lead a claim, code first applies | B | None |
| S04.2 Injury of trochlear nerve | ||||
| S04.20 Injury of trochlear nerve, unspecified side | ||||
| S04.20XA | Injury of trochlear nerve, unspecified side, initial encounterCMS: Injury of trochlear nerve, unspecified side, init encntr | Cannot lead a claimUnspecified diagnosis code not acceptable as principal diagnosis since there is a more specific code available that would further accurately identify the condition | None | None |
| S04.20XD | Injury of trochlear nerve, unspecified side, subsequent encounterCMS: Injury of trochlear nerve, unspecified side, subs encntr | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| S04.20XS | Injury of trochlear nerve, unspecified side, sequela | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| S04.21 Injury of trochlear nerve, right side | ||||
| S04.21XA | Injury of trochlear nerve, right side, initial encounter | Can lead a claim, code first applies | B | None |
| S04.21XD | Injury of trochlear nerve, right side, subsequent encounter | Can lead a claim, code first applies | B | None |
| S04.21XS | Injury of trochlear nerve, right side, sequela | Can lead a claim, code first applies | B | None |
| S04.22 Injury of trochlear nerve, left side | ||||
| S04.22XA | Injury of trochlear nerve, left side, initial encounter | Can lead a claim, code first applies | B | None |
| S04.22XD | Injury of trochlear nerve, left side, subsequent encounter | Can lead a claim, code first applies | B | None |
| S04.22XS | Injury of trochlear nerve, left side, sequela | Can lead a claim, code first applies | B | None |
| S04.3 Injury of trigeminal nerve | ||||
| S04.30 Injury of trigeminal nerve, unspecified side | ||||
| S04.30XA | Injury of trigeminal nerve, unspecified side, initial encounterCMS: Injury of trigeminal nerve, unspecified side, init encntr | Cannot lead a claimUnspecified diagnosis code not acceptable as principal diagnosis since there is a more specific code available that would further accurately identify the condition | None | None |
| S04.30XD | Injury of trigeminal nerve, unspecified side, subsequent encounterCMS: Injury of trigeminal nerve, unspecified side, subs encntr | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| S04.30XS | Injury of trigeminal nerve, unspecified side, sequela | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| S04.31 Injury of trigeminal nerve, right side | ||||
| S04.31XA | Injury of trigeminal nerve, right side, initial encounter | Can lead a claim, code first applies | B | None |
| S04.31XD | Injury of trigeminal nerve, right side, subsequent encounter | Can lead a claim, code first applies | B | None |
| S04.31XS | Injury of trigeminal nerve, right side, sequela | Can lead a claim, code first applies | B | None |
| S04.32 Injury of trigeminal nerve, left side | ||||
| S04.32XA | Injury of trigeminal nerve, left side, initial encounter | Can lead a claim, code first applies | B | None |
| S04.32XD | Injury of trigeminal nerve, left side, subsequent encounter | Can lead a claim, code first applies | B | None |
| S04.32XS | Injury of trigeminal nerve, left side, sequela | Can lead a claim, code first applies | B | None |
| S04.4 Injury of abducent nerve | ||||
| S04.40 Injury of abducent nerve, unspecified side | ||||
| S04.40XA | Injury of abducent nerve, unspecified side, initial encounterCMS: Injury of abducent nerve, unspecified side, init encntr | Cannot lead a claimUnspecified diagnosis code not acceptable as principal diagnosis since there is a more specific code available that would further accurately identify the condition | None | None |
| S04.40XD | Injury of abducent nerve, unspecified side, subsequent encounterCMS: Injury of abducent nerve, unspecified side, subs encntr | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| S04.40XS | Injury of abducent nerve, unspecified side, sequela | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| S04.41 Injury of abducent nerve, right side | ||||
| S04.41XA | Injury of abducent nerve, right side, initial encounter | Can lead a claim, code first applies | B | None |
| S04.41XD | Injury of abducent nerve, right side, subsequent encounter | Can lead a claim, code first applies | B | None |
| S04.41XS | Injury of abducent nerve, right side, sequela | Can lead a claim, code first applies | B | None |
| S04.42 Injury of abducent nerve, left side | ||||
| S04.42XA | Injury of abducent nerve, left side, initial encounter | Can lead a claim, code first applies | B | None |
| S04.42XD | Injury of abducent nerve, left side, subsequent encounter | Can lead a claim, code first applies | B | None |
| S04.42XS | Injury of abducent nerve, left side, sequela | Can lead a claim, code first applies | B | None |
| S04.5 Injury of facial nerve | ||||
| S04.50 Injury of facial nerve, unspecified side | ||||
| S04.50XA | Injury of facial nerve, unspecified side, initial encounter | Cannot lead a claimUnspecified diagnosis code not acceptable as principal diagnosis since there is a more specific code available that would further accurately identify the condition | None | None |
| S04.50XD | Injury of facial nerve, unspecified side, subsequent encounterCMS: Injury of facial nerve, unspecified side, subs encntr | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| S04.50XS | Injury of facial nerve, unspecified side, sequela | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| S04.51 Injury of facial nerve, right side | ||||
| S04.51XA | Injury of facial nerve, right side, initial encounter | Can lead a claim, code first applies | B | None |
| S04.51XD | Injury of facial nerve, right side, subsequent encounter | Can lead a claim, code first applies | B | None |
| S04.51XS | Injury of facial nerve, right side, sequela | Can lead a claim, code first applies | B | None |
| S04.52 Injury of facial nerve, left side | ||||
| S04.52XA | Injury of facial nerve, left side, initial encounter | Can lead a claim, code first applies | B | None |
| S04.52XD | Injury of facial nerve, left side, subsequent encounter | Can lead a claim, code first applies | B | None |
| S04.52XS | Injury of facial nerve, left side, sequela | Can lead a claim, code first applies | B | None |
| S04.6 Injury of acoustic nerve | ||||
| S04.60 Injury of acoustic nerve, unspecified side | ||||
| S04.60XA | Injury of acoustic nerve, unspecified side, initial encounterCMS: Injury of acoustic nerve, unspecified side, init encntr | Cannot lead a claimUnspecified diagnosis code not acceptable as principal diagnosis since there is a more specific code available that would further accurately identify the condition | None | None |
| S04.60XD | Injury of acoustic nerve, unspecified side, subsequent encounterCMS: Injury of acoustic nerve, unspecified side, subs encntr | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| S04.60XS | Injury of acoustic nerve, unspecified side, sequela | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| S04.61 Injury of acoustic nerve, right side | ||||
| S04.61XA | Injury of acoustic nerve, right side, initial encounter | Can lead a claim, code first applies | B | None |
| S04.61XD | Injury of acoustic nerve, right side, subsequent encounter | Can lead a claim, code first applies | B | None |
| S04.61XS | Injury of acoustic nerve, right side, sequela | Can lead a claim, code first applies | B | None |
| S04.62 Injury of acoustic nerve, left side | ||||
| S04.62XA | Injury of acoustic nerve, left side, initial encounter | Can lead a claim, code first applies | B | None |
| S04.62XD | Injury of acoustic nerve, left side, subsequent encounter | Can lead a claim, code first applies | B | None |
| S04.62XS | Injury of acoustic nerve, left side, sequela | Can lead a claim, code first applies | B | None |
| S04.7 Injury of accessory nerve | ||||
| S04.70 Injury of accessory nerve, unspecified side | ||||
| S04.70XA | Injury of accessory nerve, unspecified side, initial encounterCMS: Injury of accessory nerve, unspecified side, init encntr | Cannot lead a claimUnspecified diagnosis code not acceptable as principal diagnosis since there is a more specific code available that would further accurately identify the condition | None | None |
| S04.70XD | Injury of accessory nerve, unspecified side, subsequent encounterCMS: Injury of accessory nerve, unspecified side, subs encntr | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| S04.70XS | Injury of accessory nerve, unspecified side, sequela | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| S04.71 Injury of accessory nerve, right side | ||||
| S04.71XA | Injury of accessory nerve, right side, initial encounter | Can lead a claim, code first applies | B | None |
| S04.71XD | Injury of accessory nerve, right side, subsequent encounter | Can lead a claim, code first applies | B | None |
| S04.71XS | Injury of accessory nerve, right side, sequela | Can lead a claim, code first applies | B | None |
| S04.72 Injury of accessory nerve, left side | ||||
| S04.72XA | Injury of accessory nerve, left side, initial encounter | Can lead a claim, code first applies | B | None |
| S04.72XD | Injury of accessory nerve, left side, subsequent encounter | Can lead a claim, code first applies | B | None |
| S04.72XS | Injury of accessory nerve, left side, sequela | Can lead a claim, code first applies | B | None |
| S04.8 Injury of other cranial nerves | ||||
| S04.81 Injury of olfactory [1st ] nerve | ||||
| S04.811 Injury of olfactory [1st ] nerve, right side | ||||
| S04.811A | Injury of olfactory [1st ] nerve, right side, initial encounterCMS: Injury of olfactory nerve, right side, initial encounter | Can lead a claim, code first applies | B | None |
| S04.811D | Injury of olfactory [1st ] nerve, right side, subsequent encounterCMS: Injury of olfactory nerve, right side, subsequent encounter | Can lead a claim, code first applies | B | None |
| S04.811S | Injury of olfactory [1st ] nerve, right side, sequela | Can lead a claim, code first applies | B | None |
| S04.812 Injury of olfactory [1st ] nerve, left side | ||||
| S04.812A | Injury of olfactory [1st ] nerve, left side, initial encounterCMS: Injury of olfactory nerve, left side, initial encounter | Can lead a claim, code first applies | B | None |
| S04.812D | Injury of olfactory [1st ] nerve, left side, subsequent encounterCMS: Injury of olfactory nerve, left side, subsequent encounter | Can lead a claim, code first applies | B | None |
| S04.812S | Injury of olfactory [1st ] nerve, left side, sequela | Can lead a claim, code first applies | B | None |
| S04.819 Injury of olfactory [1st ] nerve, unspecified side | ||||
| S04.819A | Injury of olfactory [1st ] nerve, unspecified side, initial encounterCMS: Injury of olfactory nerve, unspecified side, init encntr | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| S04.819D | Injury of olfactory [1st ] nerve, unspecified side, subsequent encounterCMS: Injury of olfactory nerve, unspecified side, subs encntr | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| S04.819S | Injury of olfactory [1st ] nerve, unspecified side, sequela | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| S04.89 Injury of other cranial nerves | ||||
| S04.891 Injury of other cranial nerves, right side | ||||
| S04.891A | Injury of other cranial nerves, right side, initial encounterCMS: Injury of other cranial nerves, right side, init encntr | Can lead a claim, code first applies | B | None |
| S04.891D | Injury of other cranial nerves, right side, subsequent encounterCMS: Injury of other cranial nerves, right side, subs encntr | Can lead a claim, code first applies | B | None |
| S04.891S | Injury of other cranial nerves, right side, sequela | Can lead a claim, code first applies | B | None |
| S04.892 Injury of other cranial nerves, left side | ||||
| S04.892A | Injury of other cranial nerves, left side, initial encounter | Can lead a claim, code first applies | B | None |
| S04.892D | Injury of other cranial nerves, left side, subsequent encounterCMS: Injury of other cranial nerves, left side, subs encntr | Can lead a claim, code first applies | B | None |
| S04.892S | Injury of other cranial nerves, left side, sequela | Can lead a claim, code first applies | B | None |
| S04.899 Injury of other cranial nerves, unspecified side | ||||
| S04.899A | Injury of other cranial nerves, unspecified side, initial encounterCMS: Injury of other cranial nerves, unsp side, init encntr | Cannot lead a claimUnspecified diagnosis code not acceptable as principal diagnosis since there is a more specific code available that would further accurately identify the condition | None | None |
| S04.899D | Injury of other cranial nerves, unspecified side, subsequent encounterCMS: Injury of other cranial nerves, unsp side, subs encntr | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| S04.899S | Injury of other cranial nerves, unspecified side, sequela | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| S04.9 Injury of unspecified cranial nerve | ||||
| S04.9XXA | Injury of unspecified cranial nerve, initial encounter | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| S04.9XXD | Injury of unspecified cranial nerve, subsequent encounter | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| S04.9XXS | Injury of unspecified cranial nerve, sequela | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
Sources: CMS HH PPS Grouper Software v07.2.26, effective 2026-10-01, for the clinical group, comorbidity subgroup, code-first conventions and primary-position flags; CDC NCHS ICD-10-CM FY2027 code descriptions for the family title and code wording. This is the crosswalk Medicare runs a claim through. Grouping also depends on admission source, timing, the OASIS functional items and the rest of the diagnosis list.
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