Alphabetic Index FY2027

S52.042

Displaced fracture of coronoid process of left ulna

FY2027Chapter 19: Injury, poisoning and certain other consequences of external causes/S50–S59 Injuries to the elbow and forearm

Non-billable headerNot valid on its own. Use one of the more specific codes under it.

S52.042 is a non-billable ICD-10-CM code header for displaced fracture of coronoid process of left ulna. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. A 7th character is required to complete the code. Its coding notes include a Use additional code instruction, 1 Excludes1 entry and 10 Excludes2 entries.

7th character

Category S52 requires a 7th character.

Assembled code S52.042A Open code

Guidelines tips

From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.

A fracture not stated as open or closed is coded closed, and one not stated as displaced or not displaced is coded displaced. Nonunion and malunion have their own 7th characters.

Guidelines I.C.19.cTraumatic fractures: open, closed, displaced and 7th charactersRead the official text

The 7th character depends on whether the patient is in active treatment, not on who sees the patient. An aftercare Z code is not used for injury aftercare.

Guidelines I.C.19.aInjuries: application of 7th charactersRead the official text

Each injury gets its own code unless a combination code exists, with the most serious injury first. Superficial injuries at the same site as a more severe injury are not coded. Injuries during medical care are coded as complications.

Guidelines I.C.19.bCoding of injuriesRead the official text

Use additional code

Add the listed code as a secondary code, if known.

Also from chapter/block level (1 note)
Inherited from Chapter 19 Injury, poisoning and certain other consequences of external causes
  • code to identify any retained foreign body, if applicable (Z18.-)

Excludes1

Not coded here. The listed conditions generally should not be reported together.

Inherited from S52 Fracture of forearm
  • traumatic amputation of forearm (S58.-)

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

Inherited from S52.0 Fracture of upper end of ulna
  • fracture of elbow NOS (S42.40-)
  • fractures of shaft of ulna (S52.2-)
Inherited from S52 Fracture of forearm
  • fracture at wrist and hand level (S62.-)
  • periprosthetic fracture around internal prosthetic elbow joint (M97.4)
Also from chapter/block level (6 notes)
Inherited from S50–S59 Injuries to the elbow and forearm
Inherited from Chapter 19 Injury, poisoning and certain other consequences of external causes
  • birth trauma (P10-P15)
  • obstetric trauma (O70-O71)

Notes

Inherited from S52 Fracture of forearm
  • A fracture not indicated as displaced or nondisplaced should be coded to displaced
  • A fracture not indicated as open or closed should be coded to closed
  • The open fracture designations are based on the Gustilo open fracture classification
Also from chapter/block level (2 notes)
Inherited from Chapter 19 Injury, poisoning and certain other consequences of external causes
  • Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
  • The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.

7th-character codes under S52.042 16