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ICD-10-CM Codes
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O00-O9A
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O85-O92
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O91-
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2023 ICD-10-CM Diagnosis Code O91.21
2023 ICD-10-CM Diagnosis Code O91.21
Nonpurulent mastitis associated with pregnancy
2016 2017 2018 2019 2020 2021 2022 2023 Non-Billable/Non-Specific Code
- O91.21 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
- The 2023 edition of ICD-10-CM O91.21 became effective on October 1, 2022.
- This is the American ICD-10-CM version of O91.21 - other international versions of ICD-10 O91.21 may differ.
Applicable To- Gestational interstitial mastitis
- Gestational lymphangitis of breast
- Gestational mastitis NOS
- Gestational parenchymatous mastitis
The following code(s) above
O91.21 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
- Applicable To annotations, or
- Code Also annotations, or
- Code First annotations, or
- Excludes1 annotations, or
- Excludes2 annotations, or
- Includes annotations, or
- Note annotations, or
- Use Additional annotations
that may be applicable to
O91.21:
- O00-O9A
2023 ICD-10-CM Range O00-O9A
Pregnancy, childbirth and the puerperiumNote- 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
Type 1 Excludes- supervision of normal pregnancy (Z34.-)
Type 2 Excludes- 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- code from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.
- O85-O92
2023 ICD-10-CM Range O85-O92
Complications predominantly related to the puerperiumType 2 Excludes- mental and behavioral disorders associated with the puerperium (F53.-)
- obstetrical tetanus (A34)
- puerperal osteomalacia (M83.0)
- O91
ICD-10-CM Diagnosis Code O91
Infections of breast associated with pregnancy, the puerperium and lactation
2016 2017 2018 2019 2020 2021 2022 2023 Non-Billable/Non-Specific Code
Use Additional- code to identify infection
- 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
- 2017 (effective 10/1/2016): No change
- 2018 (effective 10/1/2017): No change
- 2019 (effective 10/1/2018): No change
- 2020 (effective 10/1/2019): No change
- 2021 (effective 10/1/2020): No change
- 2022 (effective 10/1/2021): No change
- 2023 (effective 10/1/2022): No change
- Mastitis (acute) (diffuse) (nonpuerperal) (subacute) N61.0
ICD-10-CM Diagnosis Code N61.0
Mastitis without abscess
2017 - New Code 2018 2019 2020 2021 2022 2023 Billable/Specific Code
Applicable To- Infective mastitis (acute) (nonpuerperal) (subacute)
- Mastitis (acute) (nonpuerperal) (subacute) NOS
- Cellulitis (acute) (nonpuerperal) (subacute) of breast NOS
- Cellulitis (acute) (nonpuerperal) (subacute) of nipple NOS
ICD-10-CM Codes Adjacent To O91.21
O91.03 Infection of nipple associated with lactation
O91.1 Abscess of breast associated with pregnancy, the puerperium and lactation
O91.11 Abscess of breast associated with pregnancy
O91.12 Abscess of breast associated with the puerperium
O91.13 Abscess of breast associated with lactation
O91.2 Nonpurulent mastitis associated with pregnancy, the puerperium and lactation
O91.21
Nonpurulent mastitis associated with pregnancy
O91.22 Nonpurulent mastitis associated with the puerperium
O91.23 Nonpurulent mastitis associated with lactation
O92 Other disorders of breast and disorders of lactation associated with pregnancy and the puerperium
O92.0 Retracted nipple associated with pregnancy, the puerperium, and lactation
O92.01 Retracted nipple associated with pregnancy
Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.
