Alphabetic Index FY2027

S20.161S

Insect bite (nonvenomous) of breast, right breast, sequela

FY2027Chapter 19: Injury, poisoning and certain other consequences of external causes/S20–S29 Injuries to the thorax

BillableComplete code, valid to report

S20.161S (also written S20161S) is a billable ICD-10-CM diagnosis code for insect bite (nonvenomous) of breast, right breast, sequela. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 294 codes in category S20 (Superficial injury of thorax). Its 7th character, S, means sequela. Its coding notes include a Use additional code instruction and 13 Excludes2 entries.

7th character

Category S20 requires a 7th character.

Assembled code S20.161S Open code

Guidelines tips

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

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.-)

Excludes2

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

Also from chapter/block level (13 notes)
Inherited from S20–S29 Injuries to the thorax
  • burns and corrosions (T20-T32)
  • effects of foreign body in bronchus (T17.5)
  • effects of foreign body in esophagus (T18.1)
  • effects of foreign body in lung (T17.8)
  • effects of foreign body in trachea (T17.4)
  • frostbite (T33-T34)
  • injuries of axilla
  • injuries of clavicle
  • injuries of scapular region
  • injuries of shoulder
  • insect bite or sting, venomous (T63.4)
Inherited from Chapter 19 Injury, poisoning and certain other consequences of external causes
  • birth trauma (P10-P15)
  • obstetric trauma (O70-O71)

Includes

Further defines or gives examples of the content of the category.

Also from chapter/block level (3 notes)
Inherited from S20–S29 Injuries to the thorax
  • injuries of breast
  • injuries of chest (wall)
  • injuries of interscapular area

Notes

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.