octoHealth

O91.21

Non-billable

Nonpurulent mastitis associated with pregnancy

Chapter 15: Pregnancy, childbirth and the puerperium

Additional Information

From parent codes: O00-O9A (Chapter 15)

Excludes 1 — Not Coded HereFrom O00-O9A

Excludes1 means 'NOT CODED HERE!' An Excludes1 note indicates mutually exclusive codes: two conditions that cannot be reported together.

  • supervision of normal pregnancy (Z34.-)
Excludes 2 — Not Included HereFrom O00-O9A

Excludes2 means 'NOT INCLUDED HERE!' An Excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time.

  • mental and behavioral disorders associated with the puerperium (F53.-)
  • obstetrical tetanus (A34)
  • postpartum necrosis of pituitary gland (E23.0)
  • puerperal osteomalacia (M83.0)
Use Additional CodeFrom O00-O9A

The 'use additional code' note instructs that a secondary code should be added to provide more detail.

  • code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.
NotesFrom O00-O9A

Additional notes from parent codes that apply to this code.

  • CODES FROM THIS CHAPTER ARE FOR USE ONLY ON MATERNAL RECORDS, NEVER ON NEWBORN RECORDS
  • 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)
  • Trimesters are counted from the first day of the last menstrual period. They are defined as follows:
  • 1st trimester- less than 14 weeks 0 days
  • 2nd trimester- 14 weeks 0 days to less than 28 weeks 0 days
  • 3rd trimester- 28 weeks 0 days until delivery