DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

S04 Injury of cranial nerve

  • Header · not billable
  • Codes take a 7th character

S04 is not billable. The category heads 114 billable codes in FY2027, grouped under 10 subdivisions. Its codes take a 7th character, so none is complete with fewer than 7 characters.

Index → code

  • Injuryoptic chiasm → S04.02
  • Injuryvisual cortex → S04.04-
  • Injuryoptic radiation → S04.03-

Where it sits

  1. Chapter 19 Injury, poisoning and certain other consequences of external causes (S00-T88)
  2. S00-S09 Injuries to the head (S00-S09)
  3. S04 Injury of cranial nerve
Billable codes
114
Subdivisions
10
CC / MCC codes
38 / 0
HCC V28 codes
0
New FY2027
0
Index entries
52

Codes in S04

  1. S04.0
    Injury of optic nerve and pathways
    Header
    Use additional code 1

    Use additional code

    • code to identify any visual field defect or blindness (H53.4-, H54.-) H53.4 H54
  2. S04.01
    Injury of optic nerve
    Header
    Inclusion terms 1

    Inclusion terms

    • Injury of 2nd cranial nerve
  3. S04.011
    Injury of optic nerve, right eye +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  4. S04.012
    Injury of optic nerve, left eye +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  5. S04.019
    Injury of optic nerve, unspecified eye +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
    Inclusion terms 1

    Inclusion terms

    • Injury of optic nerve NOS
  6. S04.02
    Injury of optic chiasm +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  7. S04.03
    Injury of optic tract and pathways
    Header
    Inclusion terms 1

    Inclusion terms

    • Injury of optic radiation
  8. S04.031
    Injury of optic tract and pathways, right side +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  9. S04.032
    Injury of optic tract and pathways, left side +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  10. S04.039
    Injury of optic tract and pathways, unspecified side +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
    Inclusion terms 1

    Inclusion terms

    • Injury of optic tract and pathways NOS
  11. S04.04
    Injury of visual cortex
    Header
  12. S04.041
    Injury of visual cortex, right side +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  13. S04.042
    Injury of visual cortex, left side +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  14. S04.049
    Injury of visual cortex, unspecified side +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
    Inclusion terms 1

    Inclusion terms

    • Injury of visual cortex NOS
  15. S04.1
    Injury of oculomotor nerve
    Header
    Inclusion terms 1

    Inclusion terms

    • Injury of 3rd cranial nerve
  16. S04.10
    Injury of oculomotor nerve, unspecified side +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  17. S04.11
    Injury of oculomotor nerve, right side +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  18. S04.12
    Injury of oculomotor nerve, left side +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  19. S04.2
    Injury of trochlear nerve
    Header
    Inclusion terms 1

    Inclusion terms

    • Injury of 4th cranial nerve
  20. S04.20
    Injury of trochlear nerve, unspecified side +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  21. S04.21
    Injury of trochlear nerve, right side +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  22. S04.22
    Injury of trochlear nerve, left side +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  23. S04.3
    Injury of trigeminal nerve
    Header
    Inclusion terms 1

    Inclusion terms

    • Injury of 5th cranial nerve
  24. S04.30
    Injury of trigeminal nerve, unspecified side +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  25. S04.31
    Injury of trigeminal nerve, right side +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  26. S04.32
    Injury of trigeminal nerve, left side +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  27. S04.4
    Injury of abducent nerve
    Header
    Inclusion terms 1

    Inclusion terms

    • Injury of 6th cranial nerve
  28. S04.40
    Injury of abducent nerve, unspecified side +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  29. S04.41
    Injury of abducent nerve, right side +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  30. S04.42
    Injury of abducent nerve, left side +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  31. S04.5
    Injury of facial nerve
    Header
    Inclusion terms 1

    Inclusion terms

    • Injury of 7th cranial nerve
  32. S04.50
    Injury of facial nerve, unspecified side +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  33. S04.51
    Injury of facial nerve, right side +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  34. S04.52
    Injury of facial nerve, left side +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  35. S04.6
    Injury of acoustic nerve
    Header
    Inclusion terms 2

    Inclusion terms

    • Injury of auditory nerve
    • Injury of 8th cranial nerve
  36. S04.60
    Injury of acoustic nerve, unspecified side +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  37. S04.61
    Injury of acoustic nerve, right side +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  38. S04.62
    Injury of acoustic nerve, left side +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  39. S04.7
    Injury of accessory nerve
    Header
    Inclusion terms 1

    Inclusion terms

    • Injury of 11th cranial nerve
  40. S04.70
    Injury of accessory nerve, unspecified side +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  41. S04.71
    Injury of accessory nerve, right side +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  42. S04.72
    Injury of accessory nerve, left side +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  43. S04.8
    Injury of other cranial nerves
    Header
  44. S04.81
    Injury of olfactory [1st ] nerve
    Header
  45. S04.811
    Injury of olfactory [1st ] nerve, right side +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  46. S04.812
    Injury of olfactory [1st ] nerve, left side +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  47. S04.819
    Injury of olfactory [1st ] nerve, unspecified side +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  48. S04.89
    Injury of other cranial nerves
    Header
    Inclusion terms 1

    Inclusion terms

    • Injury of vagus [10th] nerve
  49. S04.891
    Injury of other cranial nerves, right side +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  50. S04.892
    Injury of other cranial nerves, left side +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  51. S04.899
    Injury of other cranial nerves, unspecified side +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  52. S04.9
    Injury of unspecified cranial nerve +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters

CC/MCC: as a secondary diagnosis, unless the principal diagnosis is on the code’s PDX exclusion list (MS-DRG v44 Appendix C; list on the code card).

Sources of each column. Rows marked +7th need a 7th character: pick one to build the full code; its code card has its own flags.

Instructions

At S04

Inclusion terms

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

Code first

  • any associated intracranial injury (S06.-) S06

Code also

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

Notes that also apply

Block S00-S09 instructions (Includes 12, Excludes2 9, Code also 1): printed on the block page.

Chapter 19 instructions (Notes 2, Excludes2 2, Use additional code 1): printed on the chapter 19 page.

7th characters

7th characters for S04 defined here

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

7th characters for S04
7thMeaning (NCHS)
Ainitial encounter
Dsubsequent encounter
Ssequela

A code that takes a 7th character is invalid without it; the placeholder X fills a code shorter than 6 characters (Official Guidelines I.A.5). How 7th characters work.

Index entries

  • Injuryoptic chiasm → S04.02
  • Injuryoptic radiation → S04.03-
  • Injuryoptic tract and pathways → S04.03-
  • Injuryvisual cortex → S04.04-
  • Injurynerve NECoptic → S04.01-
  • Injurynerve NECoculomotor → S04.1-
  • Injurynerve NECtrochlear → S04.2-
  • Injurynerve NECtrigeminal → S04.3-
  • Injurynerve NECabducens → S04.4-
  • Injurynerve NECfacial → S04.5-
  • Injurynerve NECacoustic → S04.6-
  • Injurynerve NECaccessory → S04.7-
  • Injurynerve NEColfactory → S04.81-
  • Injurynerve NECglossopharyngeal → S04.89-
  • Injurynerve NEChypoglossal → S04.89-
  • Injurynerve NECvagus → S04.89-
  • Injurynerve NECcranial → S04.9
  • Injurynerve NECopticcontusion → S04.01-
  • Injurynerve NECopticlaceration → S04.01-
  • Injurynerve NECopticspecified type NEC → S04.01-
  • Injurynerve NECoculomotorcontusion → S04.1-
  • Injurynerve NECoculomotorlaceration → S04.1-
  • Injurynerve NECoculomotorspecified type NEC → S04.1-
  • Injurynerve NECtrochlearcontusion → S04.2-
  • Injurynerve NECtrochlearlaceration → S04.2-
  • Injurynerve NECtrochlearspecified type NEC → S04.2-
  • Injurynerve NECtrigeminalcontusion → S04.3-
  • Injurynerve NECtrigeminallaceration → S04.3-
  • Injurynerve NECtrigeminalspecified type NEC → S04.3-
  • Injurynerve NECabducenscontusion → S04.4-
  • Injurynerve NECabducenslaceration → S04.4-
  • Injurynerve NECabducensspecified type NEC → S04.4-
  • Injurynerve NECfacialcontusion → S04.5-
  • Injurynerve NECfaciallaceration → S04.5-
  • Injurynerve NECfacialspecified type NEC → S04.5-
  • Injurynerve NECacousticcontusion → S04.6-
  • Injurynerve NECacousticlaceration → S04.6-
  • Injurynerve NECacousticspecified type NEC → S04.6-
  • Injurynerve NECaccessorycontusion → S04.7-
  • Injurynerve NECaccessorylaceration → S04.7-

12 more, longer entries are not listed; the search box finds them by word.

NCHS Alphabetic Index. Index first, then the Tabular List.

Hierarchy