O91.21

Nonpurulent mastitis associated with pregnancy

Non-billable header

O91.21 is a non-billable header code. Use one of the more specific codes below.

Inclusion terms

Applicable to

  • Gestational interstitial mastitis
  • Gestational lymphangitis of breast
  • Gestational mastitis NOS
  • Gestational parenchymatous mastitis

Includes (from O91)

  • Note: CODES FROM THIS CHAPTER ARE FOR USE ONLY ON MATERNAL RECORDS, NEVER ON NEWBORN RECORDS
  • Note: Codes from this chapter are for use for conditions related to or aggravated by the pregnancy, childbirth, or by the puerperium (maternal causes or obstetric causes)
  • Note: Trimesters are counted from the first day of the last menstrual period. They are defined as follows:
  • Note: 1st trimester- less than 14 weeks 0 days
  • Note: 2nd trimester- 14 weeks 0 days to less than 28 weeks 0 days
  • Note: 3rd trimester- 28 weeks 0 days until delivery

Excludes1

Not coded here — never report together with this code.

  • supervision of normal pregnancy (Z34.-) (from O91)

Excludes2

Not included here — may be reported together when both conditions exist.

  • mental and behavioral disorders associated with the puerperium (F53.-) (from O91)
  • obstetrical tetanus (A34) (from O91)
  • postpartum necrosis of pituitary gland (E23.0) (from O91)
  • puerperal osteomalacia (M83.0) (from O91)
  • mental and behavioral disorders associated with the puerperium (F53.-) (from O91)
  • obstetrical tetanus (A34) (from O91)
  • puerperal osteomalacia (M83.0) (from O91)

Use additional code

Add a code to identify the following, if applicable.

  • code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known. (from O91)
  • code to identify infection (from O91)

Also known as

  • Gestational interstitial mastitis
  • Gestational lymphangitis of breast
  • Gestational mastitis NOS
  • Gestational parenchymatous mastitis
  • Mastitis, obstetric, associated with pregnancy

Parent code

  • O91.2Nonpurulent mastitis associated with pregnancy, the puerperium and lactationHeader

More specific codes O91.21

  • O91.211Nonpurulent mastitis associated with pregnancy, first trimesterBillable
  • O91.212Nonpurulent mastitis associated with pregnancy, second trimesterBillable
  • O91.213Nonpurulent mastitis associated with pregnancy, third trimesterBillable
  • O91.219Nonpurulent mastitis associated with pregnancy, unspecified trimesterBillable

Related codes

  • O91.22Nonpurulent mastitis associated with the puerperiumBillable
  • O91.23Nonpurulent mastitis associated with lactationBillable

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