S00.442A External constriction of left ear, initial encounter

Billable ICD-10-CM code, FY2026.

Built from S00.442 with 7th character A (initial encounter).

Applies from S00 Superficial injury of head

Excludes1 (never code together)

• diffuse cerebral contusion (S06.2-)
• focal cerebral contusion (S06.3-)
• injury of eye and orbit (S05.-)
• open wound of head (S01.-)

7th character note

• The appropriate 7th character is to be added to each code from category S00

7th character required

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

Code annotations containing back-references to S00.442A

Back-references to S00.4

• Type 2 Excludes: S09.3 Other specified and unspecified injury of middle and inner ear ("injury to external ear (S00.4-, S01.3-, S08.1-)")

Back-references to S00

• Code Also: G96.00 Cerebrospinal fluid leak, unspecified ("head injury (S00-S09)")
• Code Also: G96.08 Other cranial cerebrospinal fluid leak ("head injury (S00 - S09)")
• Code Also: G96.09 Other spinal cerebrospinal fluid leak ("head injury (S00 - S09)")
• Code First: R65.1 Systemic inflammatory response syndrome (SIRS) of non-infectious origin ("injury and trauma (S00-T88)")

Nearby codes

• S00.441 External constriction of right ear
• S00.441A External constriction of right ear, initial encounter
• S00.441D External constriction of right ear, subsequent encounter
• S00.441S External constriction of right ear, sequela
• S00.442 External constriction of left ear
• S00.442A External constriction of left ear, initial encounter (this code)
• S00.442D External constriction of left ear, subsequent encounter
• S00.442S External constriction of left ear, sequela
• S00.449 External constriction of unspecified ear
• S00.449A External constriction of unspecified ear, initial encounter
• S00.449D External constriction of unspecified ear, subsequent encounter