S44.00 – Injury of ulnar nerve at upper arm level, unspecified arm

ICD-10-CM 2027 diagnosis code · Injuries to the shoulder and upper arm

Non-billable header

ICD-10-CM code S44.00

Code: S44.00 (claims format: S4400)
Description: Injury of ulnar nerve at upper arm level, unspecified arm
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 19. Injury, poisoning and certain other consequences of external causes (S00-T88)
Block: S40-S49 Injuries to the shoulder and upper arm
Parent codes: S44 › S44.0

Billable codes under S44.00

S44.00 is a header code and cannot be used on claims. Choose the most specific code:

7th character values

Codes in this category need a 7th character to describe the encounter or episode of care (use placeholder X for empty positions).

Character	Meaning
`A`	initial encounter
`D`	subsequent encounter
`S`	sequela

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

S44 – Injury of nerves at shoulder and upper arm level

Excludes2 (not included here):

injury of brachial plexus (S14.3-)

Code also:

any associated open wound (S41.-)

7th character note:

The appropriate 7th character is to be added to each code from category S44

S44.0 – Injury of ulnar nerve at upper arm level

Excludes1 (not coded here):

ulnar nerve NOS (S54.0)

Block S40-S49

Includes:

injuries of axilla
injuries of scapular region

Excludes2 (not included here):

burns and corrosions (T20-T32)
frostbite (T33-T34)
injuries of elbow (S50-S59)
insect bite or sting, venomous (T63.4)

Related codes in S44.0

Frequently asked questions

What is ICD-10 code S44.00?

S44.00 is the ICD-10-CM code for injury of ulnar nerve at upper arm level, unspecified arm, in the block S40-S49 (Injuries to the shoulder and upper arm).

Is S44.00 a billable code?

No. S44.00 is a header code with more specific child codes; report one of the billable codes listed above.

What category does S44.00 belong to?

It belongs to category S44 – Injury of nerves at shoulder and upper arm level.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.